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Pressure Switch States: Notes

PRESSURE SWITCH STATES CHART

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. TCM will ignore the code. Limp-in condition will only occur if code P087K21) 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 TCM and solenoid pack
  3. OD pressure switch sense circuit shorted to battery
  4. Solenoid pack
  5. Loose valve body bolts
  6. Plugged filter - internal transmission or torque converter failure
  7. TCM

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



PRESSURE SWITCH STATES CHART

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 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.

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 TCM 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 TCM and solenoid pack
  3. 2/4 pressure switch sense circuit shorted to battery
  4. Solenoid pack
  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. TCM

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



PRESSURE SWITCH STATES CHART

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 TCM and solenoid pack
  3. LR pressure switch sense circuit shorted to battery
  4. Solenoid pack
  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. TCM

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



PRESSURE SWITCH STATES CHART

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 

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