P0011: "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)

P0011 means the intake camshaft on bank 1 is positioned more advanced than the ECU commanded it to be. The variable valve timing system is not responding correctly, typically due to oil flow issues, a faulty VVT solenoid, or a stretched timing chain affecting cam position.

P0011 is a emissions-related diagnostic trouble code classified as moderate severity. When your vehicle's ECU detects this condition, it stores P0011 and illuminates the check engine light.

If your vehicle has triggered P0011, you may notice one or more of these symptoms:

• Check engine light on
• Rough or unstable idle, possible stalling
• Hard starting, especially when the engine is warm
• Rattling noise from the engine on startup
• Reduced fuel economy
• Failed emissions test

Here are the most common causes of P0011, ranked by how likely they are to be the culprit:

Generally yes, for short-term driving. Short trips to a garage are acceptable, but the engine may stall or run roughly. Do not ignore this code long-term as it can cause increased engine wear and potential timing chain damage.

Follow these steps to pinpoint the root cause of P0011:

1. Check engine oil level and condition. Low, dirty, or incorrect viscosity oil is the most common cause. Change oil if overdue and clear the code
2. Use a scan tool to monitor the camshaft position sensor data. Compare the actual camshaft advance angle to the target angle commanded by the ECU
3. Inspect and test the VVT solenoid. Measure resistance (typically 6-13 ohms) and check for clogged screens. Command the solenoid on/off with a scan tool
4. Listen for timing chain rattle on cold startup. A stretched chain will cause a brief rattle that fades as oil pressure builds
5. If the solenoid and oil are fine, inspect timing chain stretch with a scope or by checking timing marks alignment

Repair costs for P0011 vary depending on the root cause and your vehicle. Here are typical estimates:

P0011 behaves differently depending on your vehicle. Select your car below for model-specific causes, known issues, and adjusted cost estimates:

These codes are often seen alongside P0011 or indicate related issues: