Diagnostic Trouble Code Identification. Pontiac Firebird 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Firebird 🢒 Transmission/Transaxle 🢒 Automatic Transmission - 4L60-E 🢒 Diagnostic Trouble Code Identification

Diagnostic Trouble Code Identification 5.7L

Diagnostic Trouble Code Identification (1999 F-car 4L60-E 5.7L, VIN G)

DTC

Description

DTC Type*

Default Action

P0218

Transmission Fluid Overtemperature

The PCM freezes shift adapts from being updated

P0502

Vehicle Speed Sensor Circuit Low

•	The PCM commands first gear only

•	The PCM commands maximum line pressure

•	The PCM freezes shift adapts from being updated

•	The PCM inhibits TCC engagement

P0503

Vehicle Speed Sensor Circuit Intermittent

•	The PCM commands second gear only

•	The PCM commands maximum line pressure

•	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

P0711

TFT Sensor Circuit Range/Performance

•	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

TFT Sensor Circuit Low

•	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

TFT Sensor Circuit High

•	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

The PCM disregards the brake switch input for TCC scheduling

P0724

Brake Switch Circuit High

P0740

TCC Enable Solenoid Circuit Electrical

•	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

P0742

TCC System Stuck On

The PCM freezes shift adapts from being updated

P0748

PC Solenoid Circuit Electrical

•	The PC solenoid valve is OFF

•	The PCM freezes shift adapts from being updated

P0751

1-2 SS Valve Performance

•	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 SS Circuit Electrical

•	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 SS Valve Performance

•	The PCM commands third gear only

•	The PCM commands maximum line pressure

•	The PCM inhibits TCC engagement

•	The PCM freezes shift adapts from being updated

P0758

2-3 SS Circuit Electrical

•	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 SS Circuit Electrical

•	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

TFP Switch Circuit Fault

•	The PCM commands D2 line pressure

•	The PCM commands a D4 shift pattern

•	The PCM freezes shift adapts from being updated

P1860

TCC PWM Solenoid Circuit Electrical

•	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

•	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.

Diagnostic Trouble Code Identification 3.8L

Diagnostic Trouble Code Identification (1999 F-car 4L60-E 3.8L, VIN K)

DTC

Description

DTC Type*

Default Action

P0218

Transmission Fluid Overtemperature

The PCM freezes shift adapts from being updated

P0502

Vehicle Speed Sensor Circuit Low

•	The PCM commands second gear only

•	The PCM commands maximum line pressure

•	The PCM freezes shift adapts from being updated

•	The PCM inhibits TCC engagement

P0503

Vehicle Speed Sensor Circuit Intermittent

•	The PCM commands a soft landing to second gear below 2500 RPM

•	The PCM commands maximum line pressure

•	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

P0711

TFT Sensor Circuit Range/Performance

•	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

TFT Sensor Circuit Low

•	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

TFT Sensor Circuit High

•	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

The PCM disregards the brake switch input for TCC scheduling

P0724

Brake Switch Circuit High

P0740

TCC Enable Solenoid Circuit Electrical

•	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

P0742

TCC System Stuck On

The PCM freezes shift adapts from being updated

P0748

PC Solenoid Circuit Electrical

•	The PC solenoid valve is OFF

•	The PCM freezes shift adapts from being updated

P0751

1-2 SS Valve Performance

•	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 SS Circuit Electrical

•	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 SS Valve Performance

•	The PCM commands third gear only

•	The PCM commands maximum line pressure

•	The PCM inhibits TCC engagement

•	The PCM freezes shift adapts from being updated

P0758

2-3 SS Circuit Electrical

•	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 SS Circuit Electrical

•	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

TFP Switch Circuit Fault

•	The PCM commands D2 line pressure

•	The PCM commands a D4 shift pattern

•	The PCM freezes shift adapts from being updated

P1860

TCC PWM Solenoid Circuit Electrical

•	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

•	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.