P0012 - "A" Camshaft Position - Timing Over-Retarded (Bank 1)

OBD-II DTC Trouble Code Description

"A" Camshaft Position - Timing Over-Retarded (Bank 1)

What does that mean?

A code P0012 refers to 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 DTC specifically refers to 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.

Potential Symptoms

Most likely a P0012 DTC will result in one of the following:

• 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

A P0012 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.

Other related DTCs: P0010 - P0011 - P0020 - P0021 - P0022

Need more help?

If you still need help regarding the P0012 trouble code, please post your question in our auto repair forums.

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