OBD-II trouble code
P0011: Camshaft Position A — Timing Over-Advanced or System Performance (Bank 1)
The intake camshaft on Bank 1 is more advanced than the engine computer commanded. Most often caused by a stuck variable valve timing (VVT) solenoid or dirty engine oil. Address promptly — neglected timing issues can damage the engine.
Quick facts
- System
- Powertrain
- Category
- Variable Valve Timing
- Severity
- Medium severity
- Drivable
- Usually safe to drive short-term
- Repair cost range
- $150 – $1,500
- DIY difficulty
- Intermediate DIY
What does P0011 mean?
Modern engines use variable valve timing (VVT) to optimize camshaft position based on engine speed, load, and temperature. The engine control module (ECM) commands oil pressure to a VVT actuator on the camshaft via an oil control valve (also called a VVT solenoid). The actual cam position is monitored by the camshaft position sensor and compared to the commanded position.
P0011 is set when the actual intake camshaft position on Bank 1 is more advanced than the ECM commanded — that is, the cam is leading where it should be. The ECM gives the system several attempts to reach the target before it stores the code. "Camshaft Position A" refers to the intake camshaft on most engines. Bank 1 is the side of the engine containing cylinder 1.
The most common cause is a stuck VVT solenoid, often due to thick or dirty engine oil clogging the small passages inside. Low oil level, wrong oil viscosity, and a stretched timing chain on high-mileage engines are other common causes. P0011 won't strand you, but neglected VVT problems can cause performance loss, poor fuel economy, and accelerated wear.
Common causes
- Stuck VVT solenoid due to dirty or sludged engine oil (the most common cause)
- Low engine oil level reducing oil pressure to the VVT actuator
- Wrong oil viscosity for the engine specification
- Failed VVT solenoid (oil control valve)
- Stretched timing chain on high-mileage engines
- Failed camshaft position sensor reporting inaccurate position
- Worn VVT actuator on the camshaft itself
- Sludged oil passages in the cylinder head
Symptoms
- Check engine light is on
- Rough or unstable idle
- Hesitation under acceleration
- Reduced power and throttle response
- Poor fuel economy
- Occasional stalling or hard starting
- Engine noise during cold start (rattle or knock)
Diagnostic steps
- 1.Check engine oil level and condition first. Severely dirty or low oil is the most common cause. Change the oil and filter with the manufacturer's specified viscosity and rescan after 50 to 100 miles.
- 2.Use a scan tool to monitor commanded versus actual cam position during a drive. The actual position should track the commanded position closely.
- 3.Test the VVT solenoid resistance and inspect the screen filter on the solenoid for debris.
- 4.On high-mileage engines, inspect the timing chain for stretch using the ECM's cam-to-crank correlation data.
- 5.Check the camshaft position sensor signal pattern.
Repair cost
$150 – $1,500
An oil change and rescan is $50 to $150 and resolves a meaningful share of P0011 cases on neglected engines. VVT solenoid replacement runs $200 to $700 in parts and labor. Timing chain replacement is the most expensive likely outcome at $1,000 to $2,500 depending on the engine.
Estimate your repair
Run the numbers for your vehicle
Open the Repair Cost Estimator with vvt solenoid replacement preselected. Adjust labor rate and vehicle category to fit your situation.
DIY vs shop
This is an intermediate DIY job. It usually involves diagnostic steps, specialty parts, and some careful work in tight spaces. If you have the tools and a service manual or trustworthy video for your specific vehicle, it is achievable in a weekend. Otherwise, a competent independent shop will be faster.