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Engine mechanicalSeverity Medium: diagnose soon

P0025"B" Camshaft Position – Timing Over-Retarded (Bank 2)

What it means

The exhaust (or right/rear) camshaft, bank 2, is more retarded than the ECU asked for. Often the phaser can't move because of oil pressure, or the timing is out.

Symptoms

  • Check engine light
  • Rough idle or stalling
  • Loss of power or poor fuel economy
  • Rattle on start-up (worn phaser)

Common causes

  • Low oil pressure or dirty oil
  • Sticking oil control valve
  • Worn cam phaser (often noisy on start-up)
  • Stretched timing chain or jumped tooth

What to check first

  1. Check oil level and pressure
  2. Compare desired and actual cam angle in live data
  3. Check the cam/crank correlation and the timing marks
Can I drive with P0025? Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.

Generic OBD-II meaning. Manufacturer-specific meanings and checks can differ; always check the service information for the car.

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P0025: questions and answers

What does P0025 mean?

P0025: "B" Camshaft Position – Timing Over-Retarded (Bank 2). The exhaust (or right/rear) camshaft, bank 2, is more retarded than the ECU asked for. Often the phaser can't move because of oil pressure, or the timing is out.

What are the symptoms of P0025?

Check engine light. Rough idle or stalling. Loss of power or poor fuel economy. Rattle on start-up (worn phaser).

What causes P0025?

Low oil pressure or dirty oil. Sticking oil control valve. Worn cam phaser (often noisy on start-up). Stretched timing chain or jumped tooth.

How do you diagnose P0025?

1. Check oil level and pressure 2. Compare desired and actual cam angle in live data 3. Check the cam/crank correlation and the timing marks

Can I drive with P0025?

Usually yes for a short distance, but performance or economy may suffer and the fault can get worse. Diagnose it soon.