Diagnostic Aids

Inspect for any of the following conditions:

• Inspect for any recent engine mechanical repairs. An incorrectly timed or incorrectly installed camshaft can cause a DTC P0012 to set.
• Inspect the CMP sensor reluctor for a damaged tooth. A damaged reluctor can cause an incorrect CMP sensor reading that may set a false DTC P0012.
• If a DTC P0012 and P0011 are both present, inspect for a malfunctioning CMP solenoid valve. Observe that the Cam Phase Angle and Cam Phase Angle Desired parameters on a scan tool are approximately equal. A difference in the two parameters indicates that the CMP solenoid may be sticking.
• An intermittent DTC P0012 can be caused by a loss in the oil supply to the CMP solenoid valve or the CMP actuator assembly. Inspect the oil passages for foreign material and blockage. Inspect the oil filter of the CMP actuator solenoid valve for dirt or restrictions. Refer to Camshaft Position (CMP) Actuator Solenoid Valve Filter Replacement .

An intermittent malfunction may be caused by a fault in the electrical circuit of the CMP actuator valve. Inspect the wiring harness and components for an intermittent condition. Refer to Intermittent Conditions .

The information included in the Freeze Frame data can be useful in determining the vehicle operating conditions when the DTC first set.