OBD-II FAULT CODE
P0021

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

Meaning, symptoms, likely causes, diagnostic checks and repair guidance for P0021.

PowertrainSystem
Engine timing / positionCategory
HighSeverity
  • Check Engine light
  • Poor drivability or reduced fuel economy depending on fault
  • No-start, rough running, limp mode or poor power possible
  • Faulty cam/crank sensor
  • Oil level/quality issue
  • VVT solenoid fault
  • Timing chain/belt issue
  • Wiring fault
  • Scan all modules and record freeze-frame data before clearing codes
  • Check battery voltage and related fuses
  • Check oil level/condition
  • Inspect sensor/solenoid connectors
  • Compare cam/crank correlation with scan data
  • Repair wiring or replace confirmed failed sensor/solenoid
  • Investigate mechanical timing if correlation faults remain
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Disclaimer: Information is provided for general guidance only and may not apply to all vehicles. Always consult a qualified technician.