GM Service Manual Online
For 1990-2009 cars only

Diagnostic Trouble Code Identification (1999 H-car 4T65-E)

DTC

Description

DTC Type

Default Action

P0218

Transmission Fluid Overtemperature

D

Freezes shift adapts

P0502

Vehicle Speed Sensor Circuit -- Low Input

B

    • Maximum line pressure
    • The PCM calculates vehicle speed from ISS and commanded gear
    • Freezes shift adapts

P0503

Vehicle Speed Sensor Circuit -- Intermittent

B

    • Maximum line pressure
    • The PCM calculates vehicle speed from ISS and commanded gear
    • Freezes shift adapts

P0711

Transmission Fluid Temperature Sensor Circuit -- Range/Performance

D

    • The PCM calculates a default TFT from the ECT and the IAT.
    • Freezes shift adapts

P0712

Transmission Fluid Temperature Sensor Circuit -- Low Input

D

    • The PCM calculates a default TFT from the ECT and the IAT.
    • Freezes shift adapts

P0713

Transmission Fluid Temperature Sensor Circuit -- High Input

D

    • The PCM calculates a default TFT from the ECT and the IAT.
    • Freezes shift adapts

P0716

Input Speed Sensor Circuit -- Intermittent

B

    • Inhibit TCC
    • Inhibit 4th gear in Hot Mode
    • Freezes shift adapts

P0717

Input Speed Sensor Circuit -- Low Input

B

    • Inhibit TCC
    • Inhibit 4th gear in Hot Mode
    • Freezes shift adapts

P0719

Brake Switch Circuit -- Low Input

D

Disregard brake switch input for TCC operation

P0724

Brake Switch Circuit -- High Input

D

None

P0730

Incorrect Gear Ratio

D

    • Maximum line pressure
    • Freezes shift adapts

P0741

Torque Converter Clutch System -- Stuck OFF

B

    • Inhibit TCC
    • Inhibit 4th gear in Hot Mode
    • Freezes shift adapts

P0742

Torque Converter Clutch System -- Stuck ON

A

    • TCC commanded ON at maximum capacity
    • Freezes shift adapts

P0748

Pressure Control Solenoid Circuit -- Electrical

D

    • Maximum line pressure
    • Freezes shift adapts

P0751

1-2 Shift Solenoid Valve -- Performance

B

    • Maximum line pressure
    • Inhibit 3-2 downshifts when the vehicle speed is greater than 48 km/h (30 mph)
    • Freezes shift adapts

P0753

1-2 Shift Solenoid Circuit -- Electrical

B

    • Maximum line pressure
    • Inhibit 3-2 downshifts when the vehicle speed is greater than 48 km/h (30 mph)
    • Freezes shift adapts

P0756

2-3 Shift Solenoid Valve -- Performance

A

    • Maximum line pressure
    • Inhibit TCC
    • Default to 3rd gear
    • Freezes shift adapts

P0758

2-3 Shift Solenoid Circuit -- Electrical

A

    • Maximum line pressure
    • Inhibit TCC
    • Default to 3rd gear
    • Freezes shift adapts

P1810

Transmission Fluid Pressure Manual Valve Position Switch Assembly Circuit Malfunction

B

    • Maximum line pressure
    • The PCM assumes D4 for shifting
    • Freezes shift adapts

P1811

Maximum Adapt and Long Shift

D

    • Maximum line pressure
    • Freezes shift adapts

P1814

Torque Converter Overstress

D

None

P1860

Torque Converter Clutch Pulse Width Modulation Solenoid Circuit -- Electrical

B

    • Inhibit TCC
    • Inhibit 4th gear in Hot Mode
    • Freezes shift adapts

P1887

Torque Converter Clutch Release Switch Circuit Malfunction

B

    • Inhibit TCC
    • Inhibit 4th gear in Hot Mode
    • Freezes shift adapts

DTC Types:

  • A -- Emission-related, turns the MIL ON after the first failure.
  • B -- Emission-related, turns the MIL ON during the second consecutive trip with failure.
  • D -- Non-emission-related, no lamps.