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Set Conditions

Set condition:  This code is set whenever Transmission Control System senses an internal error.

Theory of operation:  The PCM is constantly monitoring its internal processor. If an internal problem is detected, this DTC will be set. This DTC can also be set by a bad ground to the PCM and/or Trans Control Relay.

Transmission Effects:  The MIL will illuminate (this DTC can take up to five minutes of problem identification before illuminating the MIL) and the transmission system will default to the Immediate Shutdown routine.

Possible causes: 

  1. > PCM ground circuit.
  2. > Relay ground circuit
  3. > PCM

Name of code: P1684(12) - Battery was Disconnected  (Informational code Only)



Set condition:  This code is set whenever the PCM is disconnected from battery power (B+) or ground. It will also be set during the DRBIII® Battery Disconnect procedure.

Theory of operation:  A battery backed RAM (Random Access Memory) is used to maintain some learned values. When the battery B(+) is disconnected, the memory is lost. When the B(+) is restored, this memory loss is detected by the PCM. The code is set and the learned values are initialized to known constants or previously learned values from EEPROM (Electronic Erasable Programmable Read Only Memory). This results in the reinitialization of some parameters.

Transmission Effects:  Loss of trouble code data. Immediate Limp-in mode if power is lost while operating the vehicle. Normal operation is resumed if the power is restored during the same key start.

Possible causes: 

  1. > Battery voltage removed from PCM
  2. > PCM disconnected
  3. > Dead Battery
  4. > Low battery voltage during cranking
  5. > Battery Disconnect by DRBIII® or MDS2
  6. > PCM ground circuit missing.

Name of code: P0891(14) - Transmission Relay Always On 



Set condition:  This code is set if the PCM senses greater than 3 volts at the Trans Relay Output (switched battery) terminal of the PCM prior to the PCM energizing the relay.

Theory of operation:  The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the PCM. It is referred to as the Transmission Control Relay Output circuit or switched battery.

Transmission Effects:  The MIL will illuminate and the transmission system defaults to Logical Limp-in mode. Logical Limp-in mode results in the same modes of operation as Limp-in. Since the relay is stuck "on", the PCM can not open the relay, and the PCM shifts to 2nd gear.

Possible causes: 

  1. > Relay failure (welded contacts)
  2. > Short to battery in 12-volt supply and/or Transmission Control Relay Output circuit(s)
  3. > Short to voltage
  4. > PCM connector problems
  5. > PCM

Name of code: P0888(15) - Relay Output Always Off 



Set condition:  This code is set when less than 3 volts are present at the Transmission Control Relay Output (switched battery) terminals at the PCM, when the PCM is energizing the relay.

Theory of operation:  The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the PCM. It is referred to as the Transmission Control Relay Output circuit or switched battery.

After a controller reset (ignition key turned to the run position or after cranking engine), the controller energizes the relay. Prior to this the PCM verifies that the contacts are open by checking for no voltage at the switched battery terminals. After the relay is energized, the PCM monitors the terminals to verify that the voltage is greater than 3 volts.

Transmission Effects:  The MIL illuminates and the transmission system defaults to Limp-in mode.

Possible causes: 

  1. > Relay failure (intermittent relay function caused by oxidized or contaminated relay contacts)
  2. > Short to ground or open circuit in the Transmission Control Relay circuit(s)
  3. > PCM connector problem
  4. > PCM

Name of code: P0725(18) - Engine Speed Sensor Circuit 

NOTE: This code is not a Transmission Input Speed Sensor DTC


Set condition:  This code is set when the engine speed sensed by the PCM is less than 390 RPM or greater than 8000 RPM for more than 2.0 seconds.

Theory of operation:  The PCM uses a new dual port RAM internal to the controller to send the Crank Sensor signal to the Transmission Control System. If the PCM interprets this signal to be out of range when the engine is running the code is set.

Transmission Effects:  The MIL illuminates and the transmission system defaults to Limp-in mode.

Possible causes: 

  1. > Engine DTC (engine RPM related) present
  2. > PCM

Name of code: P1694(19) - Bus Communication with Engine Module 



Set condition:  If no PCI bus messages are received from the Powertrain Control Module (PCM) for 10 seconds.

Theory of operation:  The PCM uses a new dual port RAM internal to the controller to communicate with the Transmission Control System. The Transmission Control System relies on certain engine information to function properly. The Transmission Control System continuously monitors the internal engine bus to check for messages broadcast from the PCM.

Transmission Effects:  Delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started.

Possible causes: 

  1. > PCM

Name of code: P0890(20) - Switched Battery 



Set condition:  This code is set if the PCM senses voltage on any of the pressure switch inputs prior to the PCM energizing the relay.

Theory of operation:  The transmission control relay is used to supply power to the solenoid pack when the transmission is in normal operating mode. When the relay is off, no power is supplied to the solenoid pack and the transmission is in Limp-in mode. The relay output is fed back to the PCM. It is referred to as the Transmission Control Relay Output circuit or switched battery.

Immediately after a controller reset (ignition key turned to the run position or after cranking engine), the PCM verifies that the relay contacts are open by checking for no voltage at the switched battery terminals. After this is verified, the voltage at the pressure switches is checked. There should be no voltage on the pressure switches at this time. The PCM will then activate the relay.

Transmission Effects:  The MIL illuminates and the transmission system defaults to Limp-in mode.

Possible causes: 

  1. > Short to battery on one or more pressure switch sense circuits
  2. > PCM connector problems
  3. > PCM

Name of code: P0871(21) - OD Pressure Switch Sense Circuit 



Set condition:  This code is set if the OD pressure switch is open or closed at the wrong time in a given gear.

Theory of operation:  The PCM uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD clutch circuits. The pressure switches are continuously monitored for the correct states in each gear as shown below.

PRESSURE SWITCH STATES

SWITCHES R N 1ST 2ND 3RD 4TH
L/R  OPEN CLOSED CLOSED OPEN OPEN OPEN
2/4  OPEN OPEN OPEN CLOSED OPEN CLOSED
O/D  OPEN OPEN OPEN OPEN CLOSED CLOSED

Transmission Effects:  Normal operation will be experienced if no other codes are present. Transmission Control System will ignore the code. Limp-in condition will only occur if code P0871(21) is present with a code P0706(28).

Possible causes: 

  1. > If code P0944(35) is present, ignore code P0871(21) and perform code P0944 diagnostic procedures
  2. > OD pressure switch sense circuit open or shorted to ground between PCM and solenoid pack
  3. > OD pressure switch sense circuit shorted to battery
  4. > Solenoid/Pressure Switch assembly
  5. > Loose valve body bolts
  6. > Plugged filter - internal transmission or torque converter failure
  7. > PCM

Name of code: P0846(22) - 2/4 Pressure Switch Sense Circuit 



Set condition:  This code is set if the 2/4 pressure switch is open or closed at the wrong time in a given gear.

Theory of operation:  The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD elements. The pressure switches are continuously monitored for the correct states in each gear as shown below.

Transmission Effects:  If the 2/4 pressure switch is identified as closed in P or N, the code will immediately be set and normal operation will be allowed for that given key start. If the problem is identified for 3 successive key starts, the transmission will go into Limp-in mode.

PRESSURE SWITCH STATES

SWITCHES R N 1ST 2ND 3RD 4TH
L/R  OPEN CLOSED CLOSED OPEN OPEN OPEN
2/4  OPEN OPEN OPEN CLOSED OPEN CLOSED
O/D  OPEN OPEN OPEN OPEN CLOSED CLOSED

If the 2/4 pressure switch is identified as being closed in 1st or 3rd gear and was not identified as being closed in P or N, then 2nd gear or 4th gear will be substituted for 1st or 3rd gear depending on throttle angle and vehicle speed. A short period of time after the gear substitution, the transmission will return to normal operating mode. If the transmission is shifted back into 1st or 3rd gear through normal operation, and the 2/4 pressure switch remains closed, 2nd or 4th gear will be substituted briefly and then resume normal operation. If four gear substitutions occur in a given key start, the transmission will go into Limp-in mode.

If the 2/4 pressure switch is open (indicating no 2/4 clutch pressure) in 2nd or 4th gear, the Transmission Control System sets code P0846(22) and continues with normal operation. The transmission will only go into Limp-in mode if a code P0706(28) is also present. If no 2/4 clutch pressure is present a gear ratio code P0732(52) or P0734(54) will be set and cause the limp-in condition.

Possible causes: 

  1. > If code P0944(35) is present, ignore code P0846(22) and perform code P0944 diagnostic procedures
  2. > 2/4 pressure switch sense circuit open or shorted to ground between PCM and solenoid pack
  3. > 2/4 pressure switch sense circuit shorted to battery
  4. > Solenoid/Pressure Switch assembly
  5. > Transmission overheated - Excessive regulator valve leakage in valve body causing high line pressure which results in 2/4 solenoid blow-off in 1st or 3rd gear. May require new valve body if it happens only when hot.
  6. > Loose valve body bolts
  7. > Plugged filter - internal transmission or torque converter failure
  8. > PCM

Name of code: P0841(24) - LR Pressure Switch Sense Circuit 



Set condition:  This code is set if the LR pressure switch is either open or closed at the wrong time in a given gear.

Theory of operation:  The Transmission system uses three pressure switches to monitor the fluid pressure in the LR, 2/4, and OD elements. The pressure switches are continuously monitored for the correct states in each gear.

PRESSURE SWITCH STATES

SWITCHES R N 1ST 2ND 3RD 4TH
L/R  OPEN CLOSED CLOSED OPEN OPEN OPEN
2/4  OPEN OPEN OPEN CLOSED OPEN CLOSED
O/D  OPEN OPEN OPEN OPEN CLOSED CLOSED

Transmission Effects:  If a set condition is identified, 1st gear and torque converter lock-up (EMCC) will be inhibited. The vehicle will launch in 2nd gear and shift normally through the gears without allowing EMCC. If during the same key start, the set condition is no longer valid, the transmission will return to normal operation (1st and EMCC available). Limp-in will not occur unless code P0841(24) is accompanied by a code P0706(28) and the MIL will illuminate after 5 minutes of substituted operation.

Possible causes: 

  1. > If code P0944(35) is present, ignore code P0841(24) and perform code P0944(35) diagnostic procedures
  2. > LR pressure switch sense circuit, open or shorted to ground between PCM and solenoid pack
  3. > LR pressure switch sense circuit shorted to battery
  4. > Solenoid/Pressure Switch assembly
  5. > Valve body - solenoid switch valve stuck in LU position. May be accompanied by a code P1775(37)
  6. > Loose valve body bolts
  7. > Plugged filter - internal transmission or torque converter failure
  8. > PCM

Name of code: P0706(28) - Check Shifter Signal 



Set condition:  3 occurrences in one key start of an invalid PRNDL code which lasts for more than 0.1 second.

Theory of operation:  The C1 through C4 (T1, T3, T41, and T42) sense circuits communicate the shift lever position to the PCM. Each circuit is terminated at the transmission with a switch. Each switch can be either open or closed, depending on the shift lever position. The PCM can decode this information and determine the shift lever position. Each shift lever position has a certain combination of switches which will be open and closed, this is called a PRNDL code. There are 4 switches, therefore: there are many possible combinations of open and closed switches (codes). However, there are only 9 valid codes (8 for AutoStick), one for each gear position and three recognized between gear codes. The remainder of the codes should never occur,  these are called invalid codes. The following chart shows the normal switch states for each shift lever position.

41TE TRANSMISSION RANGE SENSOR STATES

TRS PARK T1 REVERSE T2 NEUTRAL T2 OD T3 O3/AS T3 L
T1 (C4) OPEN OPEN OPEN CLOSED CLOSED CLOSED CLOSED CLOSED OPEN CLOSED CLOSED
T3 (C3) CLOSED CLOSED OPEN OPEN OPEN OPEN OPEN CLOSED CLOSED CLOSED CLOSED
T41 (C1) CLOSED OPEN OPEN OPEN CLOSED OPEN OPEN OPEN OPEN OPEN OPEN
T42(C2) CLOSED CLOSED CLOSED CLOSED CLOSED CLOSED OPEN OPEN OPEN OPEN CLOSED

The following are DRBIII® reported Shift Lever Error codes (chart) 

SHIFT LEVER ERROR CODES REPORTED BY THE DRBIII®

ERROR CODE SWITCH STUCK POSITION
1  T1/C4 STUCK  OPEN 
2  T1/C4 STUCK  CLOSED 
3  T3/C3 STUCK  OPEN 
4  T3/C3 STUCK  CLOSED 
5  T42/C2 STUCK  OPEN 
6  T24/C2 STUCK  CLOSED 
7  T41/C1 STUCK  OPEN 
8  T41/C1 STUCK  CLOSED 

Transmission Effects and possible causes: 

Scenario 1)  - All PRNDL lights stay illuminated indefinitely in Park following a Key start.

  1. > Wrong Part Number PCM for application
  2. > TRS connector not plugged in
  3. > C1 through C4 (T1, T3, T41, or T42) circuits are open, shorted to ground, or shorted to 12 volts.
  4. > PCI bus failure (Open or shorted resulting in no communication to BCM or Cluster)
  5. > TRS
  6. > PCM
  7. > BCM

Scenario 2)  - "P" is indicated following a key start but all PRNDL lights illuminate in "N" following a shift from "R" to "N". If PRNDL lights illuminate in "N" and shifter is moved directly into "3" or "L" position without pausing in "OD", then the "OD" position shift schedule and electronic display will indicate "OD" until the shifter is shifted into the "OD" position and held for at least 3 seconds.

> Worn Manual Lever (Rooster Comb). Check for heavy wearing by TRS switch contacts

> Intermittent C1 through C4 (T1, T3, T41 or T42) circuits. Check for corrosion, terminal push-outs or spread terminals at PCM and/or TRS connector

> TRS

> PCM

> BCM

Scenario 3)  - If an invalid code happens while operating in the "3" or "L" position, the "3" or "L" shift schedule and electronic display will be frozen (regardless of whether "OD", "3" or "L" is selected). The display will be frozen until the shifter is moved to the "N" position (all PRNDL lights will illuminate) and then back to the "OD" position. The "N" and "OD" position must be held there for at least 3 seconds in order to resume the normal "OD" shift schedule and electronic display.

> Intermittent C1 through C4 (T1, T3, T41 or T42) circuits. Check for corrosion, terminal push-outs or spread terminals at PCM and/or TRS connector

> TRS

> PCM

> BCM

These same symptoms may occur without the code P0706(28) setting. It is possible that the invalid code that was sensed by the PCM only occurred once or twice during the given ignition key start and/or did not last for longer than 0.1 second.

Name of code: P0124(29) - Throttle Position Sensor/APPS Intermittent 

Name of code: P0122(2A) - Throttle Position Sensor/APPS Low 

Name of code: P0123(2B) - Throttle Position Sensor/APPS High 



Set condition: 

P0124- Throttle angle change > 5° in 7 milliseconds the Fault set time milliseconds 0.448 seconds

P0122- Throttle angle < 6° the Fault Set Time: 0.448 seconds

P0123- Throttle angle > 120.6° the Fault Set Time: 0.448 seconds

Theory of operation:  The transmission controller receives the throttle position signal and its ground from the Throttle Position Sensor (TPS).

The TPS has a 5 volt pull up supplied by the engine controller. The throttle signal is checked for out-of-range as well as intermittency (excessive signal changes). The engine controller transmits the throttle value via the Dual Port RAM. Most engine controllers can synthesize the throttle value if the throttle position sensor signal is lost. If a throttle error is detected by the transmission controller and the throttle value is available via the Dual Port RAM, the Dual Port RAM throttle value will be used and normal operation will continue, however a throttle fault code will be set. If a throttle error is detected and the throttle value is not available via the Dual Port RAM, normal operation will be discontinued, a throttle fault code will be set, and the MIL will be turned on after 5 min. of substituted operation.

Transmission Effects: 

Possible causes: 

> Wiring problem.

> TPS

> PCM

Name of code: P0870(31) - OD Hydraulic Pressure Test Failure 

P0845(32) - 2-4 Hydraulic Pressure Test Failure 

P0992(33) - 2-4/OD Hydraulic Pressure Test Failure 



Set condition:  Immediately after a shift into 1st, 2nd, or 3rd gear, with engine speed above 1000 RPM, the PCM momentarily turns on element pressure to the 2/4 and/or OD clutch circuits to identify that the appropriate pressure switch closes. If the pressure switch does not close it is tested again. If the switch does not close the second time, the appropriate code is set.

Theory of operation:  The PCM tests the OD and 2/4 pressure switches when they are off (OD and 2/4 are tested in 1st gear, OD in 2nd gear, and 2/4 in 3rd gear). The test verifies that the switches are operational. The PCM verifies that the switch closes when the corresponding element is applied. If a switch fails to close, it is retested. If it fails the second test, the code is set.

Transmission Effects:  The MIL illuminates and the transmission system defaults to Limp-in mode.

Possible causes: 

> Pressure switch sense circuit shorted to battery between PCM and solenoid pack.

> Low line pressure

> Solenoid/Pressure Switch assembly

PRESSURE SWITCH STATES

SWITCHES R N 1ST 2ND 3RD 4TH
L/R  OPEN CLOSED CLOSED OPEN OPEN OPEN
2/4  OPEN OPEN OPEN CLOSED OPEN CLOSED
O/D  OPEN OPEN OPEN OPEN CLOSED CLOSED

Name of code: P0944(35) - Loss Of Prime 



Set condition:  If the transmission begins to slip in any forward gear, and the pressure switch or switches that should be closed for a given gear are open, a loss of prime test begins. All available elements (in 1st gear LR, 2/4 and OD, in 2nd, 3rd, and 4th gear 2/4 and OD) are turned on by the PCM to see if pump prime exists. The code is set if none of the pressure switches respond. The PCM will continue to run the loss of prime test until pump pressure returns.

Theory of operation:  The loss of prime test is used to prevent transmission faults, which can be caused by a lack of pump prime.

Transmission Effects:  Vehicle will not move or transmission slips. Normal operation will continue if pump prime returns.

Possible causes: 

> Low transmission fluid level

> PRNDL indicates a valid OD code in the hydraulic reverse position

> Transmission fluid filter clogged or damaged

> Transmission fluid filter improperly installed (Bolts loose or O-ring missing)

> Oil pump - If a customer has a problem when the transmission is cold. Where someone shifts to reverse, reverse is engaged, and then shifts to OD and does not get OD (gets a neutral condition), and then can not get reverse or OD for 3-20 seconds, replace the oil pump. High side clearance in the oil pump will set a code 35. The pump will prime upon start-up, but as the torque converter purges air (drain down) the air will leak across the inner rotor into the pump suction port and cause a loss of prime right after the shift into OD. After 3- 20 seconds, pump prime will return and normal operation will continue. The pump should be replaced only after all other possible causes above have been checked and verified.

Name of code: P1790(36) - Fault Immediately After Shift 



Set condition:  This code is set if the associated gear ratio code is stored within 1.3 seconds after a shift.

Theory of operation:  This code will only be stored along with a 50 series code. If this code is set, it indicates the problem is mechanical in nature. When this code exists, diagnosing the transmission should be based on the associated gear ratio code and primarily mechanical causes should be considered.

Transmission Effects:  None

Possible causes: 

> Mechanical causes as listed under associated gear ratio code.

Name of code: P1775(37) - Solenoid Switch Valve Latched in TCC Position 



Set condition:  This code is set if three unsuccessful attempts are made to get into 1st gear in one given key start.

Theory of operation:  The solenoid switch valve (SSV) controls the direction of the transmission fluid when the LR/TCC solenoid is energized. The SSV will be in the downshifted position in 1st gear, thus directing the fluid to the L-R clutch circuit. In 2nd, 3rd, and 4th, it will be in the upshifted position and directs the fluid into the torque converter clutch (TCC).

When shifting into 1st gear, a special hydraulic sequence is performed to ensure SSV movement into the downshifted position. The LR pressure switch is monitored to confirm SSV movement. If movement is not confirmed (the LR pressure switch does not close), 2nd gear is substituted for 1st.

Transmission Effects:  Transmission will have no 1st gear (2nd gear will be substituted), and no EMCC operation and the MIL will illuminate after 5 minutes of substituted operation.

Possible causes: 

> PRNDL indicates a valid OD code in the hydraulic reverse position

> Valve body - Solenoid valve stuck in TCC position

> High idle speed

> Solenoid malfunction - LR pressure switch will not close

> LR Pressure Switch Sense circuit shorted to battery

Name of code: P0740(38) - Torque Converter Clutch Control Circuit 



Set condition: 

  1. The transmission must be in EMCC, with the input speed greater than 1750 RPM. The TCC/LR solenoid must achieve it's maximum duty cycle and still not be able to pull the engine speed within 60 RPM of input speed.
  2. If the transmission is in FEMCC and the engine can slip the TCC by more than 100 RPM (Engine speed - Input speed) for 10 seconds.

The code will be set if one of these event happens three times at a throttle angle less than 30 degrees.

Theory of operation:  When in 2nd, 3rd, or 4th gear, the torque converter clutch (TCC) can be locked when certain conditions are met. The TCC piston is electronically modulated by increasing the duty cycle of the LR/TCC solenoid until the torque converter slip difference (difference between engine and turbine speed) is within 60 RPM. Then the LR/TCC solenoid is fully energized (FEMCC / 100% duty cycle). Torque converter slip is monitored in FEMCC to ensure adequate clutch capacity.

Transmission Effects:  EMCC will still be available after code is set. MIL will illuminate after 5 minutes of accumulated slip in FEMCC. The transmission will attempt normal operation (not in Limp-in) even after the MIL is illuminated.

Possible causes: 

> Worn pump bushing and/or failed torque converter - both should be replaced during a rebuild with code P0740(38) present

> Solenoid/Pressure Switch assembly.

Name of code: P0750(41) - LR Solenoid Circuit 

P0755(42) - 2/4 Solenoid Circuit 

P0760(43) - OD Solenoid Circuit 

P0765(44) - UD Solenoid Circuit 



Set condition:  All four solenoids are tested for continuity continuously immediately upon start up and during vehicle operation. For solenoids that are currently energized, power is momentarily interrupted, then reenergized. For solenoids that are not currently energized, the solenoid is momentarily energized, then de-energized. Under both situations, if an inductive spike is not sensed by the PCM during the continuity check, it is re-tested twice. If it fails the test the third time, the appropriate code is set.

SOLENOID APPLICATION CHART

GEAR UD OD REV 2/4 LR
PARK          X 
REVERSE      X    X 
NEUTRAL          X 
1ST  X        X 
2ND  X      X   
3RD  X  X       
4TH    X    X   

Theory of operation:  Four solenoids are used to control the friction elements (clutches). The continuity of the solenoids circuits are periodically tested. Each solenoid is turned on or off depending on its current state. An inductive spike should be detected by the PCM during this test. If no spike is detected, the circuit is tested again to verify the failure. In addition to the periodic testing, the solenoid circuits are tested if a gear ratio or pressure switch error occurs. In this case, one failure will result in the appropriate code being set.

Transmission Effects:  The MIL will illuminate and the transmission goes into neutral if code is set above 35 Km/h (22 MPH), Limp-in mode when vehicle speed is below 35 Km/h (22 MPH).

Possible causes: 

> Open or shorted solenoid circuit(s) between PCM and Transmission Solenoid/Pressure Switch assembly

> Open ground circuit

> PCM connector problems.

> Solenoid/Pressure Switch connector problem.

> Solenoid/Pressure Switch assembly.

> PCM

Name of code: P1776(47) - Solenoid Switch Valve Latched in LR Position 



Set condition:  If the transmission senses the LR pressure switch closing while performing PEMCC or FEMCC. This code will be set after two unsuccessful attempts to perform PEMCC or FEMCC.

Theory of operation:  The solenoid switch valve (SSV) controls the direction of the transmission fluid when the LR/TCC solenoid is energized. SSV will be in the downshifted position in 1st gear, thus directing the fluid to the LR clutch circuits. In 2nd, 3rd, and 4th, the SSV will be in the upshifted position and directs the fluid into the torque converter clutch (TCC).

When doing PEMCC or FEMCC, the LR pressure switch should indicate no pressure if the SSV is in the TCC position. If the LR pressure switch indicates pressure while in PEMCC or FEMCC, EMCC operation is aborted and inhibited to avoid inadvertent application of the LR clutch. Partial EMCC will be attempted if the LR pressure switch does not indicate pressure. A second detection of LR pressure results in setting the code.

Transmission Effects:  At speeds above 72 Km/h (45 MPH), EMCC is inhibited. Once speed falls below 72 Km/h (45 MPH), the transmission will go into Limp-in mode and the MIL will illuminate after 5 minutes of substituted operation.

Possible causes: 

> Valve body - Solenoid valve stuck in LR position

> Intermittent short to ground or open circuit in LR Pressure Switch Sense circuit (with code 24 only)

> Solenoid/Pressure Switch (with code P0841(24) only)

> PCM (with code P0841(24) only)

Name of code: P0736(50) - Gear Ratio Error in Reverse 

P0731(51) - Gear Ratio Error in 1st 

P0732(52) - Gear Ratio Error in 2nd 

P0733(53) - Gear Ratio Error in 3rd 

P0734(54) - Gear Ratio Error in 4th 

P0715(56) - Input Speed Sensor Error 

P0720(57) - Output Speed Sensor Error 

P1794(58) - Speed Sensor Ground Error 



Set condition:  This code is set if the gear ratio is not correct for a period of time.

A hard code sets within 3 seconds, an intermittent code sets within 15 seconds.

Theory of operation:  The transmission system uses two speed sensors, one to measure input RPM and one to measure output RPM. These inputs are essential for proper transmission operation. Therefore, the integrity of this data is verified through the following checks:

  1. When in gear, if the gear ratio does not compare to a known gear ratio, the corresponding in-gear trouble code is set (codes 50 through 54).
  2. An excessive change in input or output speeds indicating signal intermittent will result in codes 56 and/or 57 being set.
  3. After a PCM reset in neutral, observing erratic output and input speed sensor signals indicates a loss of the common speed sensors ground. This sets a code 58.

Transmission Effects:  The transmission will not go into Limp-in mode until three gear ratio error events occur in a given key start also the MIL will illuminate after 5 minutes of substituted operation. This allows for intermittent problems to correct themselves without opening the relay. However, if a gear ratio error develops, a code is always set, but if the condition corrects itself the transmission will continue without requiring the ignition key to be cycled on and off. Many different events could occur given the range of failures possible for codes 50 through 58. The following are a few examples:

Possible causes: 

Code P0736(50) - Excludes geartrain failures which should be obvious upon disassembly

> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first

> Valve body - #1 ball check or LR switch valve sticking - may also set code P0731(51)

> Speed sensor or associated wiring - may also set codes P0731(51), P0715(56), or P0720(57)

> Failed or slipping LR clutch - may also set code P0731(51)

> Failed reverse clutch (hard code)

Code P0731(51) - Excludes geartrain failures which should be obvious upon disassembly

> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first

> Valve body - #1 ball check or LR switch valve sticking - may also set code P-0736(56) or have no Reverse

> Speed sensor or associated wiring - may also set codes P0736(50), P0715(56), or P0720(57)

> Failed or intermittent slipping UD clutch - may also set P0732(52), or P0733(53)

> Failed or slipping LR clutch - may also set code P0736(56) or have no Reverse

> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first

> Failed or slipping 2/4 clutch - may also set code P0734(54)

> Failed or intermittent slipping UD clutch - may also set code P0731(51) and/or P0733(53)

> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first

> Failed or slipping OD clutch - may also set code P0734(54)

> Failed or intermittent slipping UD clutch - may also set code P0731(51) and/or P0732(52)

Code P0734(54) - Excludes geartrain failures which should be obvious upon disassembly

> If code P0944(35) is also set, follow diagnostic procedure for code P0944(35) first

> Failed or slipping OD clutch - may also set code P0733(53)

> Failed or slipping 2/4 clutch - may also set code P0732(52)

> Failed input or output speed sensor (intermittent or hard code)

> Shorted or open wiring between PCM and speed sensor(s) (intermittent)

> PCM Connector problems and/or Speed Sensor connector

Code P1794(58)

> Open or shorted speed sensor ground (speed sensor ground is different from chassis ground)

> Open or shorted Temperature Sensor wiring to TRS

> TRS - Will also set code P1799(74)

> PCM

Name of code: P0952(69) - AutoStick Sensor Circuit Low (If equipped) 



Set condition:

  1. The transmission shift lever is not in AutoStick and either the upshift or downshift switch is closed.
  2. Upshift and downshift switches closed at the same time.

Theory of operation:  In the AutoStick Mode (manual shift mode), upshifts and downshifts are actuated manually. Shift requests are detected by monitoring the upshift and downshift switches. The PCM monitors the above set conditions. A set condition will be tolerated for up to 15 seconds before setting a code.

Transmission Effects:  The OD position shift schedule is substituted while operating in the AutoStick gear selector position. No Limp-in mode occurs.

Possible causes: 

> Wiring or connector problems

> AutoStick switch failure

> PCM

Name of code: P1797(71) - Manual Shift Overheat 



Set condition: 

  1. If the engine temperature exceeds 124°C (255°F) while operating in AutoStick mode.
  2. If the transmission temperature exceeds 135°C (275°F) while in AutoStick mode

Theory of operation:  Transmission and engine temperatures are monitored during vehicle operation. If conditions occur causing the engine or transmission to overheat, the AutoStick mode will be canceled, and a code will be set.

Transmission Effects:  The 3 position shift schedule that is used in non-AutoStick applications is substituted while operating in the AutoStick gear selector position. No Limp-in mode occurs.

Possible causes: 

> Engine overheat - refer to service information for diagnosis and repair

> Transmission Overheat

NOTE: Strenuous driving conditions may cause the vehicle to overheat. If the driver operates in or initiates AutoStick with an overheated vehicle, the code will be set.

Name of code: P0897(73) - Worn Out/Burnt Transaxle Fluid 



Set condition:  The code will be set if vehicle shudder is detected 20 times when the A/C clutch is cycled.

Theory of operation:  While in 3rd or 4th FEMCC and just before the A/C clutch engages, the Powertrain Control Module (PCM) requests the Transmission Control System to momentarily establish PEMCC operation. If vehicle shudder is detected during the FEMCC to PEMCC transition, a counter is incremented. If the count reaches 20, the trouble code is set. The driver may then notice harsh bumps when the A/C clutch is being cycled, but vehicle shudder will be eliminated. After 35 OBDII (EURO STAGE III OBD) warm-up cycles or if the code is cleared, PEMCC will be reactivated to see if shudder is still present. If one shudder event occurs, the code will be reset. Clearing the code and running battery disconnect with the DRBIII® is the only way to reset the shudder counter from 20 back to zero.

Transmission Effects:  This code does not cause the transmission to go into Limp-in mode. However, once the code is set, FEMCC to PEMCC operation before the A/C clutch engagement will be disabled for 35 OBDII (EURO STAGE III OBD) warm up starts.

Possible causes: 

> Degraded transmission fluid

> Wheels severely out of alignment

> Internal torque converter problem

Name of code: P0218(75) - High Temperature Operation Activated. 

NOTE: This DTC is an informational DTC designed to aid the technician in diagnosing shift quality concerns.


Set condition:  Immediately once the Overheat Shift Schedule is activated.

Theory of operation:  If the transmission oil temperature rises above 115°C (240°F), the overheat shift schedule is activated refer to Transmission Operation as a function of Transmission Oil Temperature and the code is set. The DTC is an information code only and is being set to aid the technician in determining root cause of a customer driveability issue. The code is also intended to alert the technician to determine if a cooling system malfunction has occurred or if an additional transmission air to oil cooler should be added to the vehicle if the customer regularly drives in a manner that overheats the transmission. Extended operation above 115°C (240°F) will reduce the durability of the transmission and should be avoided. Correcting the cooling system malfunction or installing an additional transmission oil cooler will improve transmission durability especially for customers who operate in city/construction stop and go traffic, tow trailers regularly, drive aggressively in low gear or drive regularly in mountainous areas.

Transmission effects:  Information only code. - Overheat shift schedule was activated, no Limp-in condition occurs. 2nd gear partial EMCC above 40 Km/h (25 MPH), 3rd gear EMCC from 45-69 Km/h (28-43 MPH), delayed 3-4 upshift at 69 Km/h (43 MPH), early 4-3 coastdown at 66 Km/h (41 MPH), EMCC operation under all conditions above 40 Km/h (25 MPH) except at closed throttle or 1st gear.

Possible causes: 

Name of code: P0884(76) - Power-Up at Speed 



Set condition:  If the PCM powers up while in the "Drive" position and the vehicle is going above 32 Km/h (20 MPH), the code is set.

Theory of operation:  If a vehicle loses power to the PCM, the vehicle will go to the 2nd gear mode since there is no power available to control the transmission solenoids. However if power is restored, the PCM will power-up and normal operation will be restored. This DTC identifies that power to the PCM was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 Km/h (20 MPH). If someone shifts to Neutral and cycles the ignition key and quickly shifts to "Drive" while moving before the PCM comes out of its START ROUTINE, the DTC can be set. Therefore it is critical that this DTC diagnosis repair procedure should only be used if the vehicle is experiencing intermittent 2nd gear operation and subsequently a return to normal operation during normal driving.

Transmission effects:  No Limp-in condition. The DTC is for information only when trying to diagnosis intermittent 2nd gear operation and subsequently a return to normal operation.

Possible causes: 

FOR INTERMITTENT 2ND GEAR OPERATION AND THEN A SUBSEQUENT RETURN TO NORMAL OPERATION WITHOUT CYCLING THE IGNITION KEY 

Name of code: P1687(77) - No Communication with the MIC 



Set condition:  If no PCI bus messages are received from the Mechanical Instrument Cluster (MIC) for 25 seconds.

Theory of operation:  The PCM communicates with the MIC using the PCI bus. It relies on certain information to function properly. The PCM continuously monitors the PCI bus to check for messages broadcast from the PCM.

Transmission effects:  Possible improper PCM AutoStick configuration.

Possible causes: 

> Open or shorted PCI bus circuit from MIC

> MIC

> PCM

Name of code: P1652(78) - Serial Communication Link Malfunction 



Set condition:  If no PCI bus messages are received by the Transmission Control System for 10 seconds.

Theory of operation:  The PCM communicates with the other modules in the vehicle using the PCI bus. It relies on certain information to function properly. The PCM continuously monitors the PCI bus to check for messages broadcast from the certain modules.

Transmission Effects:  Possible improper PCM AutoStick configuration and delayed 3-4 shifts. No EMCC and early 3-4 shifts for a few minutes after engine is started.

Possible causes: 

> Open or shorted PCI bus circuit from BCM

> PCM

Name of code: P0562(79) Low Battery Voltage 



Set condition:  If the voltage sensed at the Transmission Control Relay Output Sense circuit(s) to the PCM is less than 10.0 volts for the period of 15 seconds. The DTC will also set if the direct battery voltage sensed in the PCM is less than 6.5v for 200ms or where Transmission Control Relay Output Sense circuit (switched battery) is less than 7.2v for 200ms.

NOTE: P0562 generally indicates a gradually falling battery voltage or a resistive connection(s) to the PCM.

Theory of operation:  The Transmission system requires sufficient battery voltage in order to energize the transmission solenoids. The PCM continuously monitors the voltage available to the solenoids.

Transmission effects:  At speeds above 72 Km/h (45 MPH) the transmission system will default to neutral. Below 72 Km/h (45 MPH) the transmission system will default to Limp-in mode and the MIL will illuminate after 5 minutes of substituted operation. Manual gear selection of Park, Reverse, Neutral and Second will be available.

Possible causes: 

> Charging system problem

> Poor/High resistance connection between PCM and Battery/Alternator

> PCM high resistance or poor connection

> PCM ground high resistance or poor connection

> High resistance in Transmission Control Relay contacts

> PCM

Name of code: P0711(7A) - Transmission temperature sensor performance 



Set condition:  A temperature reading of 80°F is not reached in the specified period of time.

Theory of operation:  The temperature sensor (thermistor) is used to sense the temperature of the transmission fluid. Transmission fluid temperature can affect shift quality, torque converter lockup, and when and if some diagnostics are run. A failed temperature sensor could affect the OBDII diagnostics, therefore when a fault is detected in the temperature sensor circuit, transmission temperature will be based on a calculated temperature value.

Transmission effects:  When the fault is set, calculated temperature is substituted for measured temperature, however the fault code is stored only after three consecutive occurrences of the fault.

Possible causes: 

> Temperature sensor

> Temperature sensor wiring circuit.

> Internal controller

Name of code: P0712(7B) - Transmission temperature sensor low 



Set condition:  Sensor output voltage less than 0.078v.

Theory of operation:  The temperature sensor (thermistor) is used to sense the temperature of the transmission fluid. Transmission fluid temperature can affect shift quality, torque converter lockup, and when and if some diagnostics are run. A failed temperature sensor could affect the OBDII diagnostics, therefore when a fault is detected in the temperature sensor circuit, transmission temperature will be based on a calculated temperature value.

Transmission effects:  When the fault is set, calculated temperature is substituted for measured temperature, however the fault code is stored only after three consecutive occurrences of the fault.

Possible causes: 

> Temperature sensor

> Temperature sensor wiring circuit.

> Internal controller

Name of code: P0713(7C) - Transmission temperature sensor high 



Set condition:  Sensor output voltage greater than 4.94v.

Theory of operation:  The temperature sensor (thermistor) is used to sense the temperature of the transmission fluid. Transmission fluid temperature can affect shift quality, torque converter lockup, and when and if some diagnostics are run. A failed temperature sensor could affect the OBDII diagnostics, therefore when a fault is detected in the temperature sensor circuit, transmission temperature will be based on a calculated temperature value.

Transmission effects:  When the fault is set, calculated temperature is substituted for measured temperature, however the fault code is stored only after three consecutive occurrences of the fault.

Possible causes: 

> Temperature sensor

> Temperature sensor wiring circuit.

> Internal controller

Name of code: P0714(7D) - Transmission temperature sensor intermittent 



Set condition:  Temperature reading change greater than maximum change allowed per loop.

Theory of operation:  The temperature sensor (thermistor) is used to sense the temperature of the transmission fluid. Transmission fluid temperature can affect shift quality, torque converter lockup, and when and if some diagnostics are run. A failed temperature sensor could affect the OBDII diagnostics, therefore when a fault is detected in the temperature sensor circuit, transmission temperature will be based on a calculated temperature value.

Transmission effects:  When the fault is set, calculated temperature is substituted for measured temperature, however the fault code is stored only after three consecutive occurrences of the fault.

Possible causes: 

> Temperature sensor

> Temperature sensor wiring circuit.

> Internal controller

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