Tag: GMC

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) 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…

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 obd code mean? The P1415 code is set when no O2 sensor voltage change is detected by the Engine Control…

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 obd code mean? The P1416 code is set when no O2 sensor voltage change is detected by the Engine Control…

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…

Possible causes – Powertrain Control Module (PCM) not programed– PCM program– Faulty PCM– Wrong PCM Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0602 GMC OBD Code Description This diagnostic trouble code (DTC) indicates that the Powertrain Control Module (PCM) internal EEPROM is not flashed with any vehicle software. If you install…

Possible causes – Pressure Control Solenoid harness is open or shorted– Pressure Control Solenoid circuit poor electrcial connection – Faulty Control Solenoid Valve Assembly When is the obd code mean? The Transmission Control Module (TCM) has detected an internal low voltage electrical malfunction of the Pressure Control (PC) solenoid control circuit Symptoms – Engine Light…