Error code
OBD2 P0012
OBD2P0012
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.
What it means
'A' Camshaft Position - Timing Over-Retarded.
Severity
moderateCan be driven, but performance may suffer and there is a risk of engine failure if not addressed.
Summary
P0012 indicates that the camshaft position on bank 1 (intake/left/front) is timing over-retarded, which usually points to issues with valve timing or mechanical faults in the engine.
Symptoms
- Loss of gas mileage
- Engine stalling
- Check engine light appears
Common Causes
- Poor oil maintenance leading to carbon buildup and filter blockage
- Failure of the VVT/VCT solenoid due to lack of lubrication
- Electrical issues with wiring harness or connections
Diagnosis
- Use a multimeter to check resistance in the solenoid terminals (7-12 ohms)
- Pin test continuity between the valve solenoid and PCM/ECM
- Check all engine grounds and clean/tighten harness terminals
Fixes
- Replace the VVT/VCT solenoid and perform an engine cleaning with high-quality oil
FAQ
What is causing my P0012 code?
The most common cause is poor maintenance, leading to carbon buildup in the VVT/VCT system and failure of the solenoid due to lack of lubrication.
Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.
More OBD2 codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0005Fuel Shutoff Valve 'A' Control Circuit/Open
- P0006Fuel Shutoff Valve 'A' Control Circuit Low
- P0007Fuel Shutoff Valve 'A' Control Circuit High
- P0008Engine Position System Performance
- P0009Engine Position System Performance
- P0010'A' Camshaft Position Actuator Circuit
- P0011'A' Camshaft Position - Timing Over-Advanced or System Performance
- P0013'B' Camshaft Position - Actuator Circuit