P0011 — Camshaft Position Timing Over-Advanced (Bank 1)
High severityWhat it means
The actual camshaft timing on bank 1 is more advanced than the engine control unit commanded. This is a variable valve timing (VVT) fault, and in a large share of cases the root cause is low, dirty or wrong-viscosity engine oil starving the VVT system.
Common symptoms
- Rough idle and hard starting
- Loss of power
- Rattling noise from the engine
- Increased fuel consumption and check engine light
Likely causes
- Low, degraded or wrong-viscosity engine oil (very common)
- Faulty VVT/oil control solenoid
- Clogged oil passages or solenoid screen
- Stretched timing chain
- Failed camshaft phaser
What to check first
- Check the engine oil level and condition first — an oil change with the correct grade fixes many cases
- Inspect and test the VVT (oil control) solenoid and its screen
- Listen for timing chain rattle on cold start
- Compare commanded vs actual cam advance in live data
Can you keep driving?
Limit driving. Valve-timing faults can escalate into expensive engine damage — check the oil immediately and have the car inspected promptly.
Frequently asked questions
What is the most common cause of P0011?
The most likely cause is: Low, degraded or wrong-viscosity engine oil (very common). Several other faults can set P0011 as well, so confirm the real cause with live data and the checks above before replacing any parts.
Can I just clear P0011 and keep driving?
Clearing P0011 with an OBD2 scanner turns the warning light off, but if the underlying fault has not been repaired the code will usually come back within a few drive cycles. Fix the cause first, then clear the code to confirm the repair worked.
How serious is P0011?
P0011 is a high-severity code. Diagnose and repair it as soon as possible, because continuing to drive can cause further damage or leave you stranded.
Scan, log and diagnose with MechanicAI
Plug a Bluetooth OBD2 adapter into your car and let MechanicAI turn raw data into answers:
- Scan, read and clear fault codes in seconds
- Inspect every sensor with live data
- Create instant logs and automatic trip records
- And above all — analyze it all with AI for the most likely cause and clear next steps.
Related codes
All information, explanations and guidance on this page are general preliminary information only. They are estimates and may be entirely wrong, incomplete or inaccurate, or may not apply to your vehicle at all. Never take any action based on this content alone — do not decide to keep driving, clear codes, replace parts, repair or otherwise work on your vehicle based only on what you read here. In every case, and for any final decision, you must consult qualified technical personnel (a professional mechanic, an authorized service centre or an engineer) and obtain their approval before acting. MechanicAI accepts no liability or responsibility whatsoever for any damage, fault, injury, loss or outcome that may arise — directly or indirectly — from using or relying on this information, for any reason and under any circumstances. By using this page you acknowledge and accept these terms.