Engine Codes

Random/Multiple Cylinder Misfire Detected

The ECM has detected misfires occurring in multiple cylinders or cannot identify which cylinder is misfiring. This is often caused by a systemic problem affecting all cylinders.

Camshaft Position Timing Over-Retarded Bank 1

Camshaft timing is more retarded than expected on Bank 1. Similar causes to P0011 but opposite direction.

Camshaft Position Timing Over-Advanced Bank 2

Bank 2 intake camshaft timing is over-advanced. The cam is advancing beyond the commanded position.

Camshaft Position Actuator Circuit Bank 1 Exhaust

Fault in the exhaust camshaft position actuator circuit on Bank 1. Affects exhaust valve timing.

Camshaft Position Timing Over-Retarded Exhaust Bank 1

Exhaust camshaft timing is over-retarded on Bank 1.

Cylinder 5 Misfire Detected

Misfire detected in cylinder 5. Common on V6 and V8 engines where cylinder 5 ignition coil is difficult to access.

Crankshaft/Camshaft Position Correlation Bank 1 Sensor A

The crankshaft and camshaft position signals are out of sync on Bank 1. This indicates a timing issue.

Crankshaft/Camshaft Position Correlation Bank 1 Sensor B

Exhaust camshaft position signal does not correlate with crankshaft position on Bank 1.

Cylinder 1 Misfire Detected

The ECM has detected a misfire in cylinder 1. A misfire means the air/fuel mixture in that cylinder is not igniting properly or not igniting at all.

Cylinder 2 Misfire Detected

A misfire has been detected in cylinder 2. Repeated misfires can damage the catalytic converter and oxygen sensors.

Cylinder 3 Misfire Detected

Misfire detected in cylinder 3. On direct injection engines, carbon buildup on intake valves is a common cause.

Cylinder 4 Misfire Detected

Misfire in cylinder 4. If coolant level is dropping without visible leak, suspect head gasket failure.

Cylinder 6 Misfire Detected

Misfire in cylinder 6. On V6 engines this is often the rear cylinder, harder to service.

Cylinder 7 Misfire Detected

Misfire in cylinder 7. Found on V8 and V10 engines.

Cylinder 8 Misfire Detected

Misfire detected in cylinder 8. Common on V8 trucks and performance engines.

Camshaft Position Actuator Circuit Open (Bank 1)

The ECM has detected an open circuit in the camshaft position actuator (VVT solenoid) on Bank 1. This controls variable valve timing.

Camshaft Position Timing Over-Advanced Bank 1

The camshaft timing is more advanced than commanded by the ECM on Bank 1. Often caused by dirty oil or a faulty VVT solenoid.

Camshaft Position Timing Over-Advanced Exhaust Bank 1

Exhaust camshaft timing is over-advanced on Bank 1.

Throttle/Pedal Position Sensor A Circuit Malfunction

Fault in the throttle position sensor (TPS) or pedal position sensor circuit.

Throttle/Pedal Position Sensor A Range/Performance

TPS reading is out of expected range for current throttle position.

Throttle/Pedal Position Sensor A Circuit Low Input

TPS circuit voltage is below expected range.

Throttle/Pedal Position Sensor A Circuit High Input

TPS circuit voltage is above expected range.

Camshaft Position Actuator Circuit Bank 2

Electrical fault in the bank 2 intake camshaft VVT actuator circuit.

Camshaft Position Timing Over-Retarded Bank 2

Bank 2 intake camshaft timing is more retarded than commanded.

Engine Coolant Over Temperature Condition

The engine coolant temperature has exceeded the maximum safe operating limit. This is a critical condition that can cause severe engine damage.

Engine Over Speed Condition

The engine RPM has exceeded the maximum safe limit. This can cause severe internal engine damage.

Intake Air Temperature Circuit Malfunction

General fault in the intake air temperature (IAT) sensor circuit.

Intake Air Temperature Circuit Range/Performance

IAT sensor reading is outside expected range for current conditions.

Intake Air Temperature Circuit Low Input

IAT sensor voltage is lower than expected — ECM thinks air is very cold.

Intake Air Temperature Circuit High Input

IAT sensor voltage is higher than expected — ECM thinks air is very hot.

Mass Air Flow Circuit Malfunction

The MAF sensor circuit has a general fault. The ECM cannot reliably read airflow into the engine.

Mass Air Flow Sensor Range/Performance

The MAF sensor is reading airflow outside of expected range for current engine conditions.

Mass Air Flow Circuit Low Input

MAF sensor signal voltage is lower than expected. The ECM thinks less air is entering than actually is.

Mass Air Flow Circuit Intermittent

MAF sensor signal drops in and out intermittently.

Engine Coolant Temperature Circuit Malfunction

General fault in the engine coolant temperature (ECT) sensor circuit.

Engine Coolant Temperature Range/Performance

ECT sensor reading does not match expected values for current engine operating conditions.

Engine Coolant Temperature Circuit Low Input

ECT sensor voltage is lower than expected — ECM thinks engine is overheating.

Engine Coolant Temperature Circuit High Input

ECT sensor voltage is higher than expected — ECM thinks engine is very cold.

Engine Coolant Temperature Circuit Intermittent

ECT sensor signal is dropping in and out.

Coolant Temperature Below Thermostat Regulating Temperature

The engine coolant temperature does not reach the expected operating temperature. Almost always caused by a stuck-open thermostat.

Mass Air Flow Circuit High Input

MAF sensor signal voltage is higher than expected.

Idle Air Control System Malfunction

The idle air control (IAC) system is not functioning properly. This affects idle speed control.

Idle Air Control System RPM Too Low

Idle speed is lower than commanded target.

Idle Air Control System RPM Too High

Idle speed is higher than commanded target.

Knock Sensor 1 Circuit Bank 1

Fault in the knock sensor circuit on bank 1. The knock sensor detects engine detonation (pinging) and signals the ECU to retard ignition timing to prevent engine damage.

Knock Sensor 1 Range/Performance Bank 1

The knock sensor signal is outside expected parameters. The sensor may be picking up excessive vibration or failing to detect actual knock.

Knock Sensor 1 Circuit Low Bank 1

The knock sensor signal voltage is below the minimum expected level.

Knock Sensor 1 Circuit High Bank 1

The knock sensor signal is above the maximum expected voltage.

Knock Sensor 2 Circuit Bank 2

Fault in the knock sensor circuit on bank 2 of a V6 or V8 engine.

Cooling Fan 1 Control Circuit

Fault in the primary cooling fan control circuit. The ECU cannot properly control the engine cooling fan.

Cooling Fan 2 Control Circuit

Fault in the secondary cooling fan circuit. Many vehicles have two-speed fans or two separate fans.

Cooling Fan 3 Control Circuit

Fault in the tertiary cooling fan circuit on vehicles equipped with three cooling fans.