P0011: “A Camshaft Position – Timing Over-Advanced or System Performance (Bank 1)”.

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🔧 Meaning

The P0011 code indicates that the intake camshaft timing (Bank 1) is more advanced than the ECU (Engine Control Unit) expects.

This usually involves the Variable Valve Timing (VVT) or VVT-i system, often controlled by an Oil Control Valve (OCV) or camshaft actuator.

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⚙️ Common Causes

1. Dirty or low engine oil (very common cause).

2. Faulty Camshaft Position Actuator (VVT solenoid/OCV).

3. Camshaft Phaser (actuator gear) stuck in advanced position.

4. Oil passages clogged in VVT system.

5. Incorrect timing chain or belt alignment.

6. Faulty camshaft or crankshaft position sensor.

7. Wiring issues — open or short circuit in VVT or cam sensor circuit.

8. ECU fault (rare).

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🧰 Step-by-Step Diagnostic Process

1. Check Engine Oil

Ensure correct oil level and use manufacturer-specified viscosity (e.g. 5W-30).

Replace oil and filter if dirty or old.

2. Inspect Oil Control Valve (VVT Solenoid)

Disconnect connector and check for power supply.

Apply 12V and ground to see if the solenoid clicks.

Remove and clean the solenoid with carb cleaner — sludge often blocks oil flow.

.3 Check Camshaft Phaser (Actuator Gear)

With the valve cover off, check if the actuator is stuck in the advanced position.

Replace if movement is restricted.

4.Scan Live Data

Look at Camshaft Actual vs Commanded Angle.

If actual stays advanced even when the ECU commands retard, actuator or OCV is likely faulty.

5. Check Timing Chain Alignment

If timing marks are off, reset timing — stretched chains are common in higher mileage vehicles.

6. Inspect Wiring & Connectors

Look for corrosion, damaged insulation, or oil in connectors (especially OCV and cam sensor).

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🧩 Quick Repair Tips

Clean or replace the VVT solenoid (cheap and often solves it).

Perform engine oil and filter change before deeper repairs.

If code resets after cleaning, check the cam phaser and timing chain.

Always clear the code and test drive to confirm the fix.

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⚠️ If Ignored

Engine may idle rough.

Poor fuel economy.

Increased emissions.

Risk of engine damage from mistimed valves.

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