The P0011 diagnostic trouble code (DTC) indicates that the timing of the "A" camshaft (intake camshaft) on Bank 1 is more advanced than the engine control module (ECM) expects. This condition can occur due to a malfunction in the variable valve timing (VVT) system, which adjusts the camshaft timing to improve performance and efficiency.

1. Faulty or clogged Variable Valve Timing (VVT) solenoid.
2. Low or contaminated engine oil affecting VVT operation.
3. Stuck or worn camshaft timing components.
4. Incorrectly installed timing chain/belt.
5. Engine Control Module (ECM) malfunction.

• Check Engine Light (CEL) illuminated.
• Rough idling or stalling.
• Reduced engine power or performance.
• Increased fuel consumption.

1. Verify the engine oil level and condition; replace the oil if contaminated.
2. Inspect and replace the Variable Valve Timing (VVT) solenoid if faulty.
3. Check for debris or blockages in the oil passages leading to the VVT system.
4. Inspect the timing chain, belt, and tensioners for wear or misalignment.
5. Test the ECM for proper control of the camshaft timing.
6. Replacing a faulty VVT solenoid often resolves this issue, but additional diagnostics may be necessary to ensure all related components are functioning correctly.