Valve timing · Fault code

P0011

Camshaft Position — Timing Over-Advanced (Bank 1)

The variable valve timing on bank 1 is further advanced than the ECU commanded, or will not return. VVT runs on oil pressure, so this is an oil story far more often than a hardware one.

Severity EXPERT Moderate — diagnose before it gets worse
Driveability EXPERT Drive with caution — the ECU is already protecting itself
Tuning EXPERT Do not tune a car storing this — fix it first

Check first — in this order

The order is the product. A list of "possible causes" is what every parts site publishes, and it is why people replace parts blindly.

  1. Check oil level and condition first. The overwhelming majority of these are a low level, the wrong grade, or an overdue change — not a failed part. EXPERT
  2. Read commanded against actual cam angle. A solenoid obeying a wrong command is a different fault from a mechanism that cannot move. EXPERT
  3. Check the oil-control valve (VVT solenoid) for sticking and its filter screen for debris. EXPERT
  4. Only then the cam phaser / actuator itself. EXPERT

What this code does not license you to replace

  • That the phaser has failed. Dirty oil, a low level, or a stuck oil-control valve produce this far more often.
  • That it is a timing-chain fault without evidence from the cam-angle data.

Companion codes

Codes whose presence alongside P0011 changes the path.

P0300
No workshop sign-off yet. The diagnostic order on this page has had a technical review of the knowledge model, performed by a model — not a manufacturer certification and not a mechanical inspection of any vehicle. No tuner has yet put their name to this ordering. Treat it as a reasoned starting point, confirm with measurement, and get a professional to sign off before you condemn a part.

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