Refer to vehicle specific repair manual to perform component tests for the VCT unit. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. The main thing to check is to verify the operation of the VCT solenoid. * Failed timing valve control solenoid (stuck open) * Continuous oil flow to VCT piston chamber ![]() * Wiring problems (harness/wiring) in intake timing control valve control solenoid system Other details mentioned a P0012 DTC trouble code may be caused by one or more of the following: Remember to refer to an appropriate manual for specific instructions. You may also use the "Get Help" link if you need specifications or have any other related questions. Refer to manufacturer specific component tests for the VCT unit. Possible symptoms may include rough idle, stall or hard start. This check engine light code is caused by a mechanical fault of the VCT unit or related components, so there is no need for electrical diagnosis. VCT solenoid valve stuck open or continuous oil flow to piston chamberĬamshaft advance mechanism binding, or faulty VCT unit If the cam timing exceeds a maximum calibrated limit or is stuck in a retarded position, the check engine light will come on and set this trouble code. ![]() * The comprehensive component monitor, referred to as the CCM, monitors the Variable Camshaft Timing (VCT) position for over-retarded cam timing. How does a P0012 code trigger the check engine light? This code will trigger the check engine light under the following condition: ![]() SOURCE: P0012 Intake camshaft position timing overĬode P0012 - Variable Camshaft Timing Over Retarded - Bank 1
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