Tag: GMC

Possible causes – Sensor using 5 volt reference line shorted to ground– Circuit short to ground When is the obd code mean? If the voltage is out of tolerance, the PCM will set DTC P1639. Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P1639 GMC OBD Code Description The powertrain control module…

Possible causes – Shorted or open circuit within Transmission Control Module (TCM)– Faulty Transmission Control Module (TCM) Tech description Since the P0700 is just and informative code, check the TCM for more codes to resolve the problem. Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Driveability problems– Transmission shifting problems P0700 GMC…

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

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 – 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…

Possible causes – Repair other codes first Tech description If the P1380 code is set with other codes, repair other codes first and then clear the code. When is the obd code mean? If the Electronic Brake Control Module (EBCM) detects a condition which will not allow the EBCM to properly identify rough road situations…