P0025: Camshaft Position B — Timing Over-Retarded (Bank 2)
What to do
Check oil level and service interval. A brief rattle on startup alongside this code is worth reporting — it points at the phaser's locking mechanism.
What this code means
The bank 2 exhaust camshaft is retarded of its commanded position, completing the set of twelve camshaft codes that span P0010 to P0025. Read them as a group rather than individually: which banks and which camshafts are implicated tells you far more about the root cause than any single code does.
Likely causes
Start here
- Low or dirty engine oil · easy
- Clogged camshaft solenoid oil screen · easy
- Failed camshaft oil control solenoid · easy
- Worn camshaft phaser · specialist
Less common
- Stretched timing chain · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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