P0021 - A Camshaft Position – Timing Over-Advanced or System Performance (Bank 2)

System Information

Variable Valve Timing systems are used to alter the camshaft angular position in relation to the Crankshaft.
The ECM will control some form of actuator which is used to alter the valve timing.

Fault Code Explained

This fault code indicates that the ECM has detected the actuator movement requested for Camshaft ‘A’ Bank 2 does not correspond to the signal received from the Camshaft / Crankshaft sensors.
The signals are likely to be within their normal operating parameters but are providing conflicting information.

Recommended Tests

It is recommended to check the following systems and components