Possible causes:
- PCM ground circuit.
- Relay ground circuit.
- PCM
Name of code: P1684(12) - Battery was Disconnected (Informational code Only)
- Battery voltage removed from PCM
- PCM disconnected
- Dead Battery
- Low battery voltage during cranking
- Battery Disconnect by DRBIII® or MDS
- Bad PCM ground circuit.
Name of code: P0891(14) - Transmission Relay Always On
- Relay (welded contacts)
- Short to battery in 12-volt supply and/or Transmission Control Relay Output circuit(s)
- Short to voltage
- PCM connector problems
- PCM
Name of code: P0888(15) - Relay Output Always Off
- Relay failure (intermittent relay function caused by oxidized or contaminated relay contacts)
- Short to ground or open circuit in the Transmission Control Relay circuit(s)
- PCM connector problem
- PCM
Name of code: P0725(18) - Engine Speed Sensor Circuit
- Engine DTC (engine RPM related) present
- PCM
Name of code: P1694(19) - Bus Communication with Engine Module
- Open or shorted PCI bus circuit
- PCM
Name of code: P0890(20) - Switched Battery
- Short to battery on one or more pressure switch sense circuits
- PCM connector problems
- PCM
Name of code: P0871(21) - OD Pressure Switch Sense Circuit
- If code P0944(35) is present, ignore code P0871(21) and perform code P0944 diagnostic procedures
- OD pressure switch sense circuit open or shorted to ground between PCM and solenoid pack
- OD pressure switch sense circuit shorted to battery
- Solenoid pack
- Loose valve body bolts
- Plugged filter - internal transmission or torque converter failure
- PCM
Name of code: P0846(22) - 2/4 Pressure Switch Sense Circuit
- If code P0944(35) is present, ignore code P0846(22) and perform code P0944 diagnostic procedures
- 2/4 pressure switch sense circuit open or shorted to ground between PCM and solenoid pack
- 2/4 pressure switch sense circuit shorted to battery
- Solenoid pack
- 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.
- Loose valve body bolts
- Plugged filter - internal transmission or torque converter failure
- PCM
Name of code: P0841(24) - LR Pressure Switch Sense Circuit
- If code P0944(35) is present, ignore code P0841(24) and perform code P0944(35) diagnostic procedures
- LR pressure switch sense circuit open or shorted to ground between PCM and solenoid pack
- LR pressure switch sense circuit shorted to battery
- Solenoid pack
- Valve body - solenoid switch valve stuck in LU position. May be accompanied by a code P1775(37)
- Loose valve body bolts
- Plugged filter - internal transmission or torque converter failure
- PCM
Name of code: P0706(28) - Check Shifter Signal
- 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
- Pressure switch sense circuit shorted to battery between PCM and solenoid pack.
- Low line pressure
- Solenoid Pack
| 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: Name of code: P0944(35) - Loss Of Prime
- 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
- Mechanical causes as listed under associated gear ratio code.
- 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
- Worn pump bushing and/or failed torque converter - both should be replaced during a rebuild with code P0740(38) present
- Solenoid pack.
Name of code: P0750(41) - LR Solenoid Circuit
P0755(42) - 2/4 Solenoid Circuit
P0760(43) - OD Solenoid Circuit
P0765(44) - UD Solenoid Circuit
- Open or shorted solenoid circuit(s) between PCM and solenoid pack.
- Open ground circuit.
- PCM connector problems.
- Solenoid pack connector problem.
- Solenoid Pack.
- PCM
Name of code: P1776(47) - Solenoid Switch Valve Latched in LR Position
- 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 pack (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
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)
- LR seal leakage (Intermittent no drive or reverse)
- Sticky LR accumulator seals (Intermittent no drive or reverse)
- Failed reverse clutch (hard code)
- OD/Rev lip seal leakage
- Worn reaction shaft support seal rings
- Snap ring out of position
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 checkball or LR switch valve sticking - may also set code P0736(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)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
- Failed or slipping LR clutch - may also set code P0736(56) or have no Reverse
- LR seal leakage (Intermittent)
- Sticky LR accumulator seals (Intermittent)
Code P0732(52) - 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 2/4 clutch - may also set code P0734(54)
- 2/4 seal leakage (intermittent)
- Sticky accumulator seals (intermittent)
- Failed or intermittent slipping UD clutch - may also set code P0731(35) and/or P0733(53)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
Code P0733(53) 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 P0734(54)
- OD and Reverse inner and outer lip seal leakage (usually hard code)
- Sticky OD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Broken OD/UD tapered snap ring - (hard code at heavy throttle)
- Failed or intermittent slipping UD clutch - may also set code P0731(51) and/or P0732(52)
- UD seal leakage (intermittent)
- Worn input clutch hub bushing (hard code at heavy throttle)
- Sticky UD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Solenoid pack (UD pressure in 4th gear)
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)
- OD and Reverse inner and outer lip seal leakage (usually hard code)
- Sticky OD accumulator seals (intermittent)
- Worn reaction shaft support seal rings (hard code at heavy throttle)
- Broken OD/UD tapered snap ring - (hard code at heavy throttle)
- Failed or slipping 2/4 clutch - may also set code P0732(52)
- 2/4 seal leakage (intermittent)
- Sticky accumulator seals (intermittent)
Codes P0715(56) and P0720(57)
- Failed input or output speed sensor (intermittent or hard code)
- Shorted or open wiring between PCM and speed sensor(s) (intermittent)
- Connector problems at PCM connector 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)
- Wiring or connector problems
- AutoStick switch failure
- PCM
Name of code: P1797(71)- Manual Shift Overheat
- Engine overheat - refer to service information for diagnosis and repair.
- Transmission Overheat
- Restricted transmission cooling system
- Transmission fluid overfilled
- Radiator fan not functioning properly
- Extended driving in low gearNOTE: 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 Transmission Fluid
- Degraded transmission fluid
- Wheels severely out of alignment
- Internal torque converter problem
Name of code: P0218(75) - High Temperature Operation Activated.
- Transmission Overfilled with Oil
- Engine cooling fan failure
- Engine thermostat stuck closed
- Radiator corroded or packed with dirt
- Transmission Oil Cooler Plugged
- Customer driving pattern requires additional transmission cooling
Name of code: P0884(76) - Power Up at Speed
- No Problem if vehicle is started in "neutral" at speeds above 32 Km/h (20 MPH) and shifted quickly to "Drive" before TCM comes out of the START ROUTINE.
FOR INTERMITTENT 2ND GEAR OPERATION AND THEN A SUBSEQUENT RETURN TO NORMAL OPERATION WITHOUT CYCLING THE IGNITION KEY
- Intermittent Direct Battery connection between PCM and battery.
- Intermittent Fused Ignition Switch Output between PCM and ignition switch.
- Intermittent Ground to PCM.
Name of code: P1687(77) - No Communication with the MIC
- Open or shorted PCI bus circuit from MIC
- MIC
- PCM
Name of code: P1652(78) - Serial Communication Link Malfunction
- Open or shorted PCI bus circuit from BCM
- PCM
Name of code: P0562(79) Low Battery Voltage
- 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
- Temperature sensor
- Temperature sensor wiring circuit.
- Internal controller
Name of code: P0712(7B) - Transmission temperature sensor low
- Temperature sensor
- Temperature sensor wiring circuit.
- Internal controller
Name of code: P0713(7C) - Transmission temperature sensor high
- Temperature sensor
- Temperature sensor wiring circuit.
- Internal controller
Name of code: P0714(7D) - Transmission temperature sensor intermittent
- Temperature sensor
- Temperature sensor wiring circuit.
- Internal controller