P0012 Code- Camshaft Position 'A' Timing Over-Retarded Bank 1

What Does Code P0012 Mean

P0012 is the OBD-II generic code indicating the engine control module (ECM) has determined that the intake camshaft timing for bank 1 is more retarded than what the ECM has commanded it be. This over-retarded timing condition could be during the advancing or retarding phase of the camshaft timing.

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Possible symptoms

• Engine Light ON (or Service Engine Soon Warning Light)

Possible causes

• Dirty or low engine oil
• Faulty variable valve timing (VVT)
• Faulty oil control valve (OCV)
• Variable Valve Timing (VVT) harness is open or shorted
• Oil Control Valve (OCV) harness circuit is open or shorted
• Damaged ECM

Troubleshooting P0012

• Use a multi meter and take resistance
• As a general rule- every terminal needs to be checked for a solenoid failure. If it does not have a 7-12 ohm on the multi meter, it is most likely failed. Always pin test from the valve solenoid to PCM or ECM.
• Pin test means you must check continuity in the wiring harness between the actual valve solenoid and the brain (computer pcm/ecm)
• While pin testing in back probe, wiggle test all related harnesses and observe readings on vault meter/multi meter
• Check all engine grounds
• Also, clean and tighten every harness terminals from the valve solenoid to the pcm. The integrity of those contacts must be tightly mated and lubricated with grease to make sure full electric contact is present. The misdiagnosed problem is engine vibration which will loosen the harness connecters because most variable cam shaft timing systems rely on high revolution engines. So, any loose wiring or connections may cause this code. It does not mean the actual valve is a problem.
  • First check the resistance of the actual valve. Most only have two terminals, will likely present 7-12 oms.
  • Often the exhaust camshaft valve solenoid will be the issue, so interchange the two valves one for another and clearing codes.
  • If the code changes to the exhaust then it is P0015
  • The intake and the exhaust solenoid will have the same type of connection and are interchangeable. Try interchanging one solenoid for the other. If after erasing all present codes, a different code comes back, then you have essentially eliminated the actual valve solenoid and have saved hours of diagnostic work. By interchanging most times if one code changes to the other, you can got your parts guy and ask for the valve solenoid.
• The failure of the solenoid VVC or VCT is usually due to oil blockage from the screen/filter.

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