Possible causes – Low engine coolant level– Faulty Engine Coolant Temperature (ECT) sensor– Faulty engine coolant thermostat– Engine Coolant Temperature (ECT) sensor harness is open or shorted– Engine Coolant Temperature (ECT) sensor circuit poor electrical connection When is the obd code mean? An excessively low voltage from the sensor is sent to ECM. Symptoms –…
Tag: GMC
P0118 GMC Engine Coolant Temperature Circuit High Input
Possible causes – Low engine coolant level– Faulty Engine Coolant Temperature (ECT) sensor– Faulty engine coolant thermostat– Engine Coolant Temperature (ECT) sensor harness is open or shorted– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection When is the obd code mean? When the Powertrain Control Module (PCM) senses a signal voltage higher than the…
P0125 GMC Insufficient Coolant Temperature for Closed Loop Fuel Control
Possible causes – Low engine coolant level– Leaking or stuck open thermostat– Faulty Engine Coolant Temperature (ECT) sensor– Engine Coolant Temperature (ECT) sensor harness is open or shorted– Engine Coolant Temperature (ECT) sensor electrical circuit poor connection When is the obd code mean? The voltage sent to Powertrain Control Module (PCM) from the Engine Coolant…
P0521 GMC Engine Oil Pressure Sensor/Switch Circuit Range/Performance
Possible causes – Low oil level or motor mechanical fault– Faulty oil pressure sensor– Oil Pressure Sensor harness is open or shorted– Oil Pressure Sensor circuit poor electrical connection When is the obd code mean? The P0521 is detected when the signal sent from oil pressure sensor to PCM goes out of range. Symptoms –…
P0052 GMC HO2S Heater Control Circuit High Bank 2 Sensor 1
Possible causes – Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted to ground– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection– Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1– Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit fuse– Faulty Engine Control Module (ECM) When is…
P2178 GMC Fuel Trim System Rich at Cruise or Accel
Possible causes – High fuel pressure– Leaking fuel injector or pressure regulator– Failed Mass Air Flow (MAF) sensor When is the obd code mean? The Engine Control Module (ECM) has detected a rich air/fuel ratio Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2178 GMC OBD Code Description The Engine Control Module…
P1508 GMC Idle Speed Low Idle Air Control System Not Responding
Possible causes – Idle Air Control Valve harness is open or shorted– Idle Air Control Valve circuit poor electrical connection– Faulty Idle Air Control Valve Symptoms – Engine Light ON (or Service Engine Soon Warning Light)– Engine rough idle
P0410 GMC Secondary Air Injection System Malfunction
Possible causes – Faulty Vacuum hoses damaged– Faulty Air Pump inoperative– Air bypass solenoid harness is open or shorted– Air bypass solenoid circuit poor electrical connection– Air bypass solenoid leaking/blocked or stuck open/closed– Air diverter valve leaking/blocked or stuck open/closed Tech description Visually inspect AIR pump and AIR bypass valve harness and connector, if connector…
P0608 GMC Vehicle Speed Output Circuit
Possible causes – Faulty Vehicle Speed Sensor– Vehicle Speed Sensor harness is open or shorted– Vehicle Speed Sensor circuit poor electrical connection When is the obd code mean? If the fault detection circuit senses a voltage other than what is expected, the fault line status changes causing the P0608 to set. Symptoms – Engine Light…
P0502 GMC Vehicle Speed Sensor Circuit Low Input
Possible causes – Faulty Vehicle Speed Sensor– Vehicle speed sensor harness or connectors is open or shorted– Vehicle speed sensor circuit poor electrical connection– Faulty Powertrain Control Module (PCM) When is the obd code mean? If the Powertrain Control Module (PCM) detects a low vehicle speed when there is a high engine speed in a…