Tag: GMC

Possible causes – Dirty throttle body– Electric throttle control actuator misadjusted or damaged– Faulty Electric throttle control actuator– Intake air leak– Poor electrical connection to the Intake Air Control (IAC) valve Tech description If there are no intake leaks, clean throttle body, adjust engine idle and erase engine code. If the code comes back you…

Possible causes – EGR passage clogged– Faulty EGR Valve– EGR solenoid valve harness is open or shorted– EGR solenoid valve circuit poor electrical connection Tech description EGR flow malfunction could be caused by a clogged EGR valve or EGR tube. Before replacing any parts try cleaning the EGR valve, tube and passages. When is the…

Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1648 GMC OBD Code Description The Engine Control Module (ECM), the Powertrain Interface Module (PIM), and…

Possible causes – Deterrent key not programmed to vheicle– Faulty Deterrent key– Fualty ignition switch– Poor electrical connection for Deterrent circuit components Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– No or hard engine start situation P1677 GMC OBD Code Description The Engine Control Module (ECM), the Powertrain Interface Module (PIM), and…

Possible causes – A/C system low or over charged with refrigerant– Faulty A/C Refrigerant Pressure Sensor– Cooling fans in-operative– A/C Refrigerant Pressure Sensor harness is open or shorted– A/C Refrigerant Pressure Sensor circuit poor electrical connection When is the obd code mean? The P0530 code is detected when the signal circuit is less than 5…

Possible causes – Accelerator Pedal Position Sensor 1-2 harness is open or shorted – Accelerator Pedal Position Sensor 1-2)circuit poor electrcila connection – Faulty Accelerator Pedal Position Sensor 1-2 Symptoms – Engine Light ON (or Service Engine Soon Warning Light) – Possible poor acceleration P1271 GMC OBD Code Description

Possible causes – Air leak between the MAF sensor and throttle body– Dirty Throttle body or Mass Air Flow (MAF) sensor– Throttle Position (TP) sensor not seated properly– Faulty Throttle Position (TP) sensor– Faulty Mass Air Flow (MAF) sensor When is the obd code mean? If the PCM detects that the difference between the actual…

Possible causes – Battery charge– Faulty Generator– Generator harness is open or shorted– Generator circuit poor electrical connection– Engine Control Module (ECM) controlled generator– Faulty ECM Tech description The ECM is detecting a high turn-on voltage at times. Possible causes could be the alternator or the ECM. When is the obd code mean? The Engine…

Possible causes – Battery charge– Faulty Generator– Generator harness is open or shorted– Generator circuit poor electrical connection– Engine Control Module (ECM) controlled generator– Faulty ECM When is the obd code mean? The Engine Control Module (ECM) has fault detection circuitry which monitors the state of the generator turn on signal circuit. If the fault…

Possible causes – Battery defective– Loose or missing alternator drive belt– Faulty alternator– Open or short system voltage circuit Tech description Higher than expected voltage problems are most likely caused by bad voltage regulator. The voltage regulator is part of the alternator. When is the obd code mean? The Powertrain Control Module (PCM) has detected…