Tag: GMC

P0088 GMC Fuel Rail/System Pressure Too High

Possible causes – Sticking fuel rail pressure regulator When is the obd code mean? The actual fuel rail pressure is above operating specifications. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0088 GMC OBD Code Description

P0420 GMC Catalyst System Low Efficiency Bank 1

Possible causes – Three way catalyst converter Bank 1– Exhaust tube– Intake air leaks– Fuel injectors may be faulty– Fuel injector leaks– Spark plugs may be faulty– Improper ignition timing– Powertrain Control Module (PCM) Tech description As the code description implies the P0420 code means that the vehicle’s control module has detected that the three-way…

P0430 GMC Catalyst System Low Efficiency Bank 2

Possible causes – Three way catalyst converter Bank 2– Exhaust tube– Intake air leaks– Fuel injectors may be faulty– Fuel injector leaks– Spark plugs may be faulty– Improper ignition timing– Powertrain Control Module (PCM) Tech description As the code description implies the P0430 code means that the vehicle’s control module has detected that the three-way…

P0121 GMC Throttle Position Sensor 1 Performance

Possible causes – Throttle position sensor harness is open or shorted– Throttle position sensor circuit poor electrical connection– Faulty throttle position sensor.– Faulty Engine Control Module (ECM) When is the obd code mean? Malfunction is detected when an excessively low or high voltage from the sensor is sent to ECM. Symptoms – Engine Light ON…

P1870 GMC Transmission Component Slipping

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 GMC OBD Code Description

P1686 GMC Transmission Control Module Power Up Temperature Sensor Circuit High Voltage

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 GMC OBD Code Description The Transmission Control Module (TCM) power up the temperature sensor is located inside of the control solenoid (w/body and TCM) valve assembly…