OBD-II Trouble Code Description for P0012 GMC

“A” Camshaft Position – Timing Over-Retarded

What does this mean?

OBD2 Code P0012 GM definition:
A code P0012 GM definition:the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car’s PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0012 GM DTC specifically definition:the camshaft (cam) timing. In this case, if the cam timing is over-retarded, the engine light will be illluminated and the code will be set. The “A” camshaft is either the intake, left, or front camshaft.

Symptoms

Possible sumptoms of OBD code P0012 GM
Most likely a P0012 GM DTC will result in one of the following: P0012 GM hard starting poor idle and/or stalling There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.

Causes

Possible causes of OBD code P0012 GM
A P0012 GM DTC trouble code may be caused by one or more of the following: Incorrect camshaft timing Wiring problems (harness/wiring) in intake timing control valve control solenoid system Continuous oil flow to VCT piston chamber Failed timing valve control solenoid (stuck open)

Possible Solutions

The main thing to check is to verify the operation of the VCT solenoid. You’re looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.

Related Codes

P0010 GM P0011 GM P0020 GM P0021 GM P0022 GM