Possible causes – Faulty Wheel Speed Sensor– Wheel Speed Sensor harness is open or shorted– Wheel Speed Sensor circuit poor electrical connection When is the code detected? The Engine Control Module (ECM) detects an invalid rough road signal from the
Possible causes – Fualty ECM– Wrong ECM for vehicle– Service program error When is the code detected? Engine Control Module (ECM) program does not recognize the vehicles id, or the id is missing in the ECM. Symptoms – Engine Light
Possible causes – High fuel pressure– Leaking fuel injector or pressure regulator– Failed Mass Air Flow (MAF) sensor When is the code detected? The Engine Control Module (ECM) has detected a rich air/fuel ratio Symptoms – Engine Light ON (or
Possible causes – Leaking fuel pressure regulator– Leaking fuel injector When is the code detected? The average long term fuel trim values at idle are less than -30 percent for 10 seconds Symptoms – Engine Light ON (or Service Engine
Possible causes – Repair other codes first Tech notes If the P1380 code is set with other codes, repair other codes first and then clear the code. When is the code detected? If the Electronic Brake Control Module (EBCM) detects
Possible causes – Repair other codes first Tech notes If the P1381 code is set with other codes, repair other codes first and then clear the code. When is the code detected? If a loss of communication occurs which causes
Possible causes – Reprogram TCM and recheck code– Replace Transmission Control Module (TCM) Sensor/body assembly one piece Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1684 PONTIAC Description The Transmission Control Module (TCM) power up the temperature
Possible causes – Reprogram TCM and recheck code– Replace Transmission Control Module (TCM) Sensor/body assembly one piece Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1685 PONTIAC Description The Transmission Control Module (TCM) power up the temperature
Possible causes – Reprogram TCM and recheck code– Replace Transmission Control Module (TCM) Sensor/body assembly one piece Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1686 PONTIAC Description The Transmission Control Module (TCM) power up the temperature
Possible causes – Faulty Dynamic Headlamp Leveling (DHL) Control Module– DHL Control Module harness is open or shorted– DHL Control Module circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0181 PONTIAC Description Modules
Possible causes – Faulty Distance Sensing and Cruise Control (DSCC) Module– DSCC Module harness is open or shorted– DSCC Module circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0104 PONTIAC Description Modules connected
Possible causes – Faulty Electronic Brake Control Module (EBCM) – EBCM harness is open or shorted– EBCM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0121 PONTIAC Description Modules connected to the high
Possible causes – Faulty Engine Control Module (ECM)– ECM harness is open or shorted– ECM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0100 PONTIAC Description Modules connected to the high speed General
Possible causes – Faulty ignition switch– Faulty Electronic Brake Control Module (EBCM) Relay– Faulty EBCM– EBCM harness is open or shorted– EBCM circuit poor electrical connection
Possible causes – Faulty Ignition Switch– Ignition Switch harness is open or shorted– Ignition Switch circuit poor electrical connection When is the code detected? Whne the BCM detects a short to ground in the circuit or a short to battery
Possible causes – Faulty Instrument Panel Module (IPM)– IPM harness is open or shorted– IPM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0141 PONTIAC Description Modules connected to the high speed General
Possible causes – Faulty Transmission Control Module (TCM)– TCM harness is open or shorted– TCM circuit poor electrical connection Symptoms – Engine Light ON (or Service Engine Soon Warning Light) U0101 PONTIAC Description Modules connected to the high speed General