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 notes

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 notes

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 notes

Possible causes – Low battery charge– Battery defective– Loose or missing alternator drive belt– Faulty alternator– Open or short system voltage circuit Tech notes Start by recharging or replacing the battery. When is the code detected? The Powertrain Control Module

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 code

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 code

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

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 code detected? The P0521 is detected when the

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 code detected? The P0522 is set when the

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 code detected? The P0522 is set when the

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty 1-2 Shift Solenoid valve– 1-2 Shift Solenoid valve harness or connectors– 1-2 Shift Solenoid valve circuit is open or shorted Tech notes When the a transmission solenoid is stuck

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty 1-2 Shift Solenoid valve– 1-2 Shift Solenoid valve harness or connectors– 1-2 Shift Solenoid valve circuit is open or shorted Tech notes When the a transmission solenoid is stuck

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty 1-2 Shift Solenoid valve– 1-2 Shift Solenoid valve harness or connectors– 1-2 Shift Solenoid valve circuit is open or shorted When is the code detected? When the Powertrain Control

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 code detected? When the Powertrain Control

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 code detected? When the Powertrain Control

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 code detected? When the Powertrain Control

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 When is the code detected? When the Powertrain Control Module (PCM)

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty shifting solenoid valve– Shifting solenoid valve harness is open or shorted– Shifting solenoid valve circuit poor electrical connection When is the code detected? When the Powertrain Control Module (PCM)

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty torque converter clutch solenoid valve– Torque converter clutch solenoid valve harness is open or shorted– Torque converter clutch solenoid valve circuit poor electrical connection When is the code detected?

Possible causes – Low transmission fluid level– Dirty transmission fluid– Faulty torque converter clutch solenoid valve– Torque converter clutch solenoid valve harness or connectors– Torque converter clutch solenoid valve circuit is open or shorted– Transmission internal mechanical problem Tech notes