GM Service Manual Online
For 1990-2009 cars only

Diagnostic Trouble Code (DTC) Identification

DTC

Description

DTC Type*

Default Action

P0218

Transmission Fluid Overtemperature

D

    • DTC P0218 stores in PCM history
    • The PCM freezes shift adapts from being updated

P0502

Vehicle Speed Sensor Circuit - Low Input

B

    • DTC P0502 stores in PCM history
    • The PCM commands second gear only
    • The PCM commands maximum line pressure
    • The PCM inhibits TCC engagement
    • The PCM freezes shift adapts from being updated

P0503

Vehicle Speed Sensor Circuit - Intermittent

B

    • DTC P0503 stores in PCM history
    • The PCM commands a soft landing to second gear
    • The PCM commands maximum line pressure
    • The PCM inhibits TCC engagement
    • The PCM inhibits fourth gear if the transmission is in hot mode.
    • The PCM freezes shift adapts from being updated

P0711

Transmission Fluid Temperature Sensor Circuit - Range/Performance

B

    • DTC P0711 stores in PCM history
    • The PCM uses a transmission fluid temperature default value based on engine coolant, engine run time and IAT at startup
    • The PCM freezes shift adapts from being updated

P0712

Transmission Fluid Temperature Sensor Circuit - Low Input

D

    • DTC P0712 stores in PCM history
    • The PCM uses a transmission fluid temperature default value based on engine coolant, engine run time and IAT at startup
    • The PCM freezes shift adapts from being updated

P0713

Transmission Fluid Temperature Sensor Circuit - High Input

D

    • DTC P0713 stores in PCM history
    • The PCM uses a transmission fluid temperature default value based on engine coolant, engine run time and IAT at startup
    • The PCM freezes shift adapts from being updated

P0719

Brake Switch Circuit - Low Input

D

    • DTC P0719 stores in PCM history
    • The PCM disregards the brake switch input for TCC scheduling.

P0724

Brake Switch Circuit - High Input

D

DTC P0724 stores in PCM history

P0740

Torque Converter Clutch Enable Solenoid Circuit - Electrical

A

    • DTC P0740 stores in PCM history
    • The PCM inhibits TCC engagement
    • The PCM inhibits fourth gear if the transmission is in hot mode
    • The PCM freezes shift adapts from being updated

P0742

Torque Converter Clutch System - Stuck ON

B

    • DTC P0742 stores in PCM history
    • The PCM freezes shift adapts from being updated

P0748

Pressure Control Solenoid Circuit - Electrical

D

    • DTC P0748 stores in PCM history
    • The PC Sol. Valve is OFF.
    • The PCM freezes shift adapts from being updated

P0751

1-2 Shift Solenoid Valve - Performance

A

    • DTC P0751 stores in PCM history
    • The PCM commands D2 line pressure
    • The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph)
    • The PCM freezes shift adapts from being updated

P0753

1-2 Shift Solenoid Circuit - Electrical

A

    • DTC P0753 stores in PCM history
    • The PCM commands D2 line pressure
    • The PCM inhibits 3-2 downshifts if the vehicle speed is greater than 48 km/h (30 mph)
    • The PCM freezes shift adapts from being updated

P0756

2-3 Shift Solenoid Valve - Performance

A

    • DTC P0756 stores in PCM history
    • The PCM commands 3rd gear only
    • The PCM commands maximum line pressure
    • The PCM inhibits TCC engagement
    • The PCM freezes shift adapts from being updated

P0758

2-3 Shift Solenoid Circuit - Electrical

A

    • DTC P0758 stores in PCM history
    • The PCM commands 3rd gear only
    • The PCM commands maximum line pressure
    • The PCM inhibits TCC engagement
    • The PCM freezes shift adapts from being updated

P0785

3-2 Shift Solenoid Circuit - Electrical

A

    • DTC P0785 stores in PCM history
    • The PCM commands a soft landing to 3rd gear
    • The PCM inhibits TCC engagement
    • The PCM commands maximum line pressure
    • The PCM inhibits 4th gear if the transmission is in hot mode
    • The PCM freezes shift adapts from being updated

P1810

Transmission Fluid Pressure Manual Valve Position Switch Assembly Circuit Malfunction

B

    • DTC 1810 stores in PCM history
    • The PCM commands D2 line pressure
    • The PCM commands a D4 shift pattern
    • The PCM freezes shift adapts from being updated

P1860

Torque Converter Clutch Pulse Width Modulation Solenoid Circuit - Electrical

A

    • DTC P1860 stores in PCM history
    • The PCM inhibits TCC engagement
    • The PCM inhibits 4th gear if the transmission is in hot mode
    • The PCM freezes shift adapts from being updated

P1870

Transmission Component Slipping

B

    • DTC P1870 stores in PCM history
    • The PCM inhibits TCC engagement
    • The PCM commands maximum line pressure
    • The PCM inhibits 4th gear if the transmission is in hot mode
    • The PCM freezes shift adapts from being updated

*DTC Types:

  • A - Emission-related, turns the MIL ON after the first failure.
  • B - Emission-related, turns the MIL ON after two consecutive trips with failure.
  • C - Non-emission-related, turns the service lamp ON after the first failure.
  • D - Non-emission-related, no lamps.