Tag: GMC

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…

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…

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…

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

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 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…

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 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…

Possible causes – Missing or loose fuel cap– Incorrect fuel filler cap used– Fuel filler cap remains open or fails to close– Foreign matter caught in fuel filler cap– EVAP canister or fuel tank leaks– EVAP system hose leaking– Fuel tank leaking– Faulty vent solenoid– Faulty EVAP purge switch Tech description The P0440 code means…

Possible causes – Obstructions in the airflow of the radiator or transmission cooler– Kinked or damaged transmission fluid lines– Damage to the transmission cooler Tech description Check transmission fluid level and condition and replaced fluid if necessary. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0634 GMC OBD Code Description The control…

Possible causes – Plugged vapor canister– Faulty vent solenoid– Pinched or blocked EVAP hose– Faulty FTP sensor Tech description Dirt and dust intrusion into the EVAP canister vent hose assembly, resulting in restricted air flow, may cause this condition. There is a bulletin for the following models:1999-2007 GMC Sierra (Classic) Models2007-2008 GMC Sierra Models GMC…

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 obd code mean? The Powertrain Control Module (PCM) has detected a throttle plate out of position based on commanded and…