P0021 OBD II Trouble Code "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

Detailed information on troubleshooting and repairing a p0021 dtc diagnostic trouble code which refers to a camshaft position actuator circuit.

Symptoms of P0021 OBD II Trouble Code

    Most likely a P0021 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.

Common Causes of P0021 OBD II Trouble Code

  • 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)