Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty 2-3 Shift Solenoid Valve– 2-3 Shift Solenoid Valve harness or connectors– 2-3 Shift Solenoid Valve circuit is open or shorted When is the obd code mean? When the Powertrain Control Module (PCM) detects a continuous open, short to ground or short to power in…
Tag: GMC
P0746 GMC Pressure Control Solenoid Performance or Stuck Off
Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty line pressure solenoid valve– Line pressure solenoid valve harness is open or shorted– Line pressure solenoid valve circuit poor electrical connection When is the obd code mean? The gear required by the Engine Control Module (ECM) does not match the actual gear when driving…
P0747 GMC Pressure Control Solenoid A Stuck On
Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty Pressure Control Solenoid– Pressure Control Solenoid harness is open or shorted– Pressure Control Solenoid circuit poor electrical connection Tech description When the a transmission solenoid is stuck on, in most cases the problem is not the electrical part of the solenoid; the problem is…
P0523 GMC Engine Oil Pressure Sensor Circuit High Voltage
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 P0522 is set when the Powertrain Control Module (PCM) senses a signal voltage higher than the normal operating range…
P0540 GMC Intake Air Heater Feedback Circuit
Possible causes – Intake air heater relay Tech description The most common problem that sets code p0540 is the air intake relay Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P0540 GMC OBD Code Description The Engine Control Module (ECM) uses an Intake Air Heater (IAH) to warm the incoming air for…
P0174 GMC Fuel Trim System Lean Bank 2
Possible causes – Intake air leaks– Faulty front heated oxygen sensor– Ignition misfiring – Faulty fuel injectors – Exhaust gas leaks– Incorrect fuel pressure– Lack of fuel– Faulty Mass Air Flow (MAF) sensor– Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech description If the P0171 is combined with the P0174 code, it’s very likely that…
P0171 GMC Fuel Trim System Lean Bank 1
Possible causes – Intake air leaks– Faulty front heated oxygen sensor– Ignition misfiring– Faulty fuel injectors– Exhaust gas leaks– Incorrect fuel pressure– Lack of fuel– Faulty Mass Air Flow (MAF) sensor– Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech description If the P0171 is combined with the P0174 code, it’s very likely that the problem…
P2188 GMC Fuel Trim System Rich at Idle
Possible causes – Leaking fuel pressure regulator– Leaking fuel injector When is the obd code mean? The average long term fuel trim values at idle are less than -30 percent for 10 seconds Symptoms – Engine Light ON (or Service Engine Soon Warning Light) P2188 GMC OBD Code Description The engine control module (ECM) controls…
P0128 GMC Engine Coolant Temperature Below Thermostat Regulating Temperature
Possible causes – Leaking or stuck open thermostat– Low engine coolant level– Insufficient warm up time– Faulty engine coolant temperature sensor– Engine coolant temperature sensor harness is open or shorted– Engine coolant temperature sensor circuit poor electrical connection Tech description If cooling system is not leaking and the fluid level is OK, replacing the thermostat…
P0562 GMC System Voltage Low
Possible causes – Low battery cahrge– Battery defective– Loose or missing alternator drive belt– Faulty alternator– Open or short system voltage circuit Tech description Start by recharging or replacing the battery. When is the obd code mean? The Powertrain Control Module (PCM) has detected that the electrical system voltage level is too low. Symptoms –…