Possible causes – Faulty Throttle Position Sensor– Throttle Position Sensor harness is open or shorted– Throttle Position Sensor circuit poor electrical connection– Throttle Position Sensor not properly adjusted When is the code detected? When the Powertrain Control Module (PCM) senses

Possible causes – Faulty Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid– Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid harness is open or shorted– Torque Converter Clutch Pulse Width Modulation (TCC PWM) Solenoid circuit poor electrical connection

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 – Idle Air Control Valve harness is open or shorted– Idle Air Control Valve circuit poor electrical connection– Faulty Idle Air Control Valve Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine rough idle

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 – Poor connection at the Throttle Actuator Control (TAC) module– Faulty TAC module– Faulty Throttle Pedal Position (TPP) or Throttle Position (TPS) sensors– Binding or bent throttle plate-failed throttle body When is the code detected? The Powertrain Control

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 BUICK 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 BUICK 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 BUICK Description The Transmission Control Module (TCM) power up the temperature

Possible causes – Secondary Air Injection check valve bank 2– Secondary Air Injection (AIR) pump electrical circuit fault – Blocked Secondary Air Injection (AIR) system – Faulty Secondary Air Injection (AIR) pump When is the code detected? The P1415 code

Possible causes – Secondary Air Injection check valve bank 2– Secondary Air Injection (AIR) pump electrical circuit fault – Blocked Secondary Air Injection (AIR) system – Faulty Secondary Air Injection (AIR) pump When is the code detected? The P1416 code

Possible causes – Trailer towing may set code– Check transmission fluid level– Internal transmission fault Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1870 BUICK Description Transmission is in 4th gear with Torque Converter Clutch (TCC) engaged

Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1130 BUICK Description The Heated Oxygen Sensor (HO2S) is monitored for switching. The test fails when the HO2S does not switch due to circuit or fuel at or exceeding

Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1131 BUICK Description A Heated Exhaust Oxygen (HO2S) sensor indicating lean at the end of a test is trying to correct for an over-rich condition. The test fails when

Symptoms – Engine Light ON (or Service Engine Soon Warning Light) BUICK Technical Service Bulletins for P1631 code 2004 BUICK RAINIER ENGINE AND ENGINE COOLING:ENGINE

Symptoms – Engine Light ON (or Service Engine Soon Warning Light)