Diagnostic Trouble Code Identification. Buick Roadmaster 1996

For 1990-2009 cars

#### Diagnostic Trouble Code (DTC) Identification

DTC | Description | DTC Type* | Default Action
--- | --- | --- | ---

P0502

Vehicle Speed Sensor (VSS) Circuit - Low Input

A

• | DTC P0502 stores in PCM memory

• | Second gear only

• | Maximum line pressure

• | Freeze shift adapts from being updated

• | Inhibit TCC Sol. Valve engagement

P0560

System Voltage Malfunction

D

• | DTC P0560 stores in PCM memory

• | All transmission output devices are off except the TCC PWM Solenoid Valve and the 3-2 Shift Solenoid Valve Assembly.

• | Freeze shift adapts from being updated

P0712

Automatic Transmission Fluid Temperature (TFT) Sensor Circuit - Low Input (High Temperature Indicated)

B

• | DTC P0712 is stored in PCM memory

• | Transmission temperature defaults to 135°C (275°F)

• | Freeze shift adapts from being updated

P0713

Automatic Transmission Fluid Temperature (TFT) Sensor Circuit - High Input (Low Temperature Indicated)

B

• | DTC P0713 is stored in PCM memory

• | Transmission temperature defaults to 135°C (275°F)

• | Freeze shift adapts from being updated

P0719

TCC Sol. Valve Brake Switch Circuit - Low Input

A

• | DTC P0719 is stored in PCM memory

• | Inhibit TCC Sol. Valve engagement

• | Inhibit 4th gear if in hot mode

• | Freeze shift adapts from being updated

P0724

TCC Sol. Valve Brake Switch Circuit - High Input

D

• | DTC P0724 is stored in PCM memory

• | Freeze shift adapts from being updated

P0742

Torque Converter Clutch (TCC) System Stuck ON

A

• | DTC P0742 is stored in PCM memory

• | Freeze shift adapts from being updated

P0748

Pressure Control Solenoid Valve (PC Sol. Valve) - Electrical

D

• | DTC P0748 is stored in PCM memory

• | Freeze shift adapts from being updated

P0751

1-2 Shift Solenoid Valve - Performance

B

• | DTC P0751 is stored in PCM memory

• | D2 line pressure

• | Freeze shift adapts from being updated

P0753

1-2 Shift Solenoid Valve - Electrical

A

• | DTC P0753 is stored in PCM memory

• | Maximum line pressure

• | Freeze shift adapts from being updated

P0756

2-3 Shift Solenoid Valve - Performance

B

• | DTC P0756 is stored in PCM memory

• | Maximum line pressure

• | Inhibit TCC Sol. Valve engagement

• | Freeze shift adapts from being updated

P0758

2-3 Shift Solenoid Valve - Electrical

A

• | DTC P0758 is stored in PCM memory

• | Default to 3rd gear

• | Freeze shift adapts from being updated

• | Maximum line pressure

• | Inhibit TCC Sol. Valve engagement

P1572

Traction Control Circuit Active Too Long in Park/Neutral

A

• | DTC P1572 is stored in PCM memory

• | TCC is OFF

• | Freeze shift adapts from being updated

• | Inhibit 4th gear in Hot mode

P1810

Automatic Transmission Fluid Pressure (TFP) Manual Valve Position Switch Circuit Malfunction

B

• | DTC 1810 is stored in PCM memory

• | D2 line pressure

• | D4 shift pattern

• | Freeze shift adapts from being updated

P1812

Transmission Fluid Overtemperature

D

• | DTC P1812 is stored in PCM memory

• | Freeze shift adapts from being updated

P1860

TCC PWM Sol. Valve Circuit - Electrical

A

• | DTC P1860 is stored in PCM memory

• | Inhibit TCC Sol. Valve engagement

• | Inhibit 4th gear in Hot mode

• | Maximum line pressure

• | Freeze shift adapts from being updated

P1864

TCC Sol. Valve Circuit - Electrical

A

• | DTC P1864 is stored in PCM memory

• | Inhibit TCC Sol. Valve engagement

• | Inhibit 4th gear in Hot mode

• | Freeze shift adapts from being updated

P1870

Transmission Component Slipping

A

• | DTC P1870 is stored in PCM memory

• | Inhibit TCC Sol. Valve engagement

• | Maximum line pressure

• | Inhibit 4th gear in Hot mode

• | Freeze shift adapts from being updated

P1886

3-2 Shift Solenoid Valve Assembly Circuit--Electrical

A

• | DTC P1886 is stored in PCM memory

• | Inhibit TCC Sol. Valve engagement

• | Maximum line pressure

• | Inhibit 4th gear in Hot mode

• | Soft landing to 3rd gear

• | Freeze 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.