![]() The ECM will turn on the Check Engine Light if the timing cannot be commanded to move. Oil flow problems to the VCT piston and phaser.The camshaft phaser is damaged and stuck in the retarded position.The variable camshaft timing (VCT) oil control valve (OCV) stuck in the open position.This over-retarded timing condition could be during the advancing or retarding phase of the camshaft timing. 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. The use of the wrong kind of oil can trigger code P0012, as well as various other related error codes.Camshaft Position “A” - Timing Over-Retarded (Bank 1) What the P0012 code means It can also cause various issues with the engine. If the oil is too thick the system can malfunction and trigger a number of error codes. Due to the nature of these components, the oil needs to be the right viscosity in order for it to function as intended. The timing of the advance and retard is controlled by camshaft phaser controls using oil and oil pressure. Visual inspections should be performed to correct any obvious issues, while a pinpoint diagnosis will ensure that the correct fault is repaired. ![]() When attempting to repair the P0012 error code it’s important to verify the exact cause of the error.
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