Fix P0011: Mechanic’s solutions that WORKED

The code P0011, termed “Intake Camshaft Position Timing – Over-Advanced on Cylinder Bank 1,” indicates a fault in the timing of the camshaft in relation to the crankshaft. This code is often associated with issues related to the Variable Valve Timing (VVT) system or oil flow to the camshaft. If not addressed, it can lead to reduced engine performance, poor fuel efficiency, and possible engine damage.

P0011 quick overview

Meaning	P0011: Intake Camshaft Position Timing – Over-Advanced on Cylinder Bank 1.
Is it serious?	Yes, it can be serious. If left untreated, it can result in reduced engine performance, poor fuel efficiency, and in extreme cases, engine damage.
Possible causes	– Faulty or clogged VVT oil control solenoid. – Low engine oil level or old, degraded oil. – Faulty camshaft or crankshaft position sensors. – Timing chain/belt issues. – Engine oil system clog leading to reduced oil flow. – Faulty VVT controller or related components.
How to diagnose?	– Scan the vehicle to confirm P0011 and check for other related codes. – Inspect engine oil level and quality. Consider an oil change if the oil is old or degraded. – Test the VVT oil control solenoid for proper operation. – Inspect the camshaft and crankshaft position sensors for faults. – Check the timing chain/belt for any signs of wear or misalignment. – Use a quality scanner to assess the cam and crank alignment, if possible. – Perform an engine oil system flush if oil flow restrictions are suspected. – Check related wiring and connections for damages or disconnections.
What is VVT solenoid?	– The VVT (Variable Valve Timing) solenoid – Contains a spool inside a cylinder, actuated by electromagnetic coils based on engine control module signals – Controls oil flow to the VVT system, adjusting camshaft position and valve timing.

How to fix P0011 – learn from mechanics

I looked into P0011 service cases at iatn.com website where in the private forums the mechanics seek advice from other mechanics. I looked up a bunch of cases to help you decide how to fix your issue and see what would a real mechanic do to solve it.

Case #1: Cadillac

Vehicle Information:
2010 Cadillac CTS Luxury 3.0L

Issue + Repair History:

• Vehicle experienced a cutout issue with a P0011 code (“A” Camshaft Position – Timing Over-Advanced).
• The customer noted that the car died once while driving, but no engine light was displayed.
• No previous repair history was mentioned for this specific code.

Suggestions from the Community:

• Mechanic 1 identified the P0011 code as likely related to a faulty cam position actuator and suggested replacing specific parts.
• Mechanic 2 recommended checking oil change records for irregularities.
• Mechanic 3 suggested checking the oil level first, as P0011 typically indicates an issue with the intake cam position (VVT system).
• Mechanic 4 shared a similar experience with a Chevy, where the issue was the bank 1 intake cam actuator solenoid.
• Mechanic 5 pointed out a potential issue with the camshaft position sensor on the intake valves.

Final Fix:
The vehicle’s oil level was found to be 2 quarts low. After changing the oil, the P0011 code went away, and the vehicle’s performance improved.

Case #2: Chevrolet

Vehicle Information:
2007 Chevrolet Silverado 2500 HD LT 6.0L

Issue + Repair History:

• Vehicle intermittently cuts off when coming to a stop or turning at slow speed. Occasionally, it doesn’t start for 2-3 minutes.
• Experienced codes: P0011 and P0016.
• The cam sensor was replaced, and CMP/CKP relearned, but the issue persisted. After replacing the magnet/VCT control, the phaser seemed to be getting stuck.

Suggestions from the Community:

• Mechanic 1 emphasized the importance of using the correct oil and timely maintenance, suggesting that sticking phasers might be related to maintenance issues.
• Mechanic 2 suggested checking for a loose cam sensor magnet.
• Mechanic 3 pointed out that the issue might be related to oil condition or a faulty phaser and stressed the importance of maintenance.

Final Fix:
The cam phaser and actuator valve were replaced, resolving the issue, and the vehicle is now functioning properly.

Case #3: Nissan

Vehicle Information:
2014 Nissan Altima S 2.5L

Issue + Repair History:

• The customer reported a P0011 code, with the car occasionally stalling or running poorly.
• During a test, the car died while idling in the shop but generally runs well when operational.
• The oil level and condition were satisfactory.
• The technician believed the vehicle required an intake camshaft solenoid replacement.

Suggestions from the Community:

• A question was raised about which solenoid on the intake side is responsible for causing the P0011 code.
• The mechanic commented that there are three solenoids at the passenger rear. The center one, an intake solenoid, was replaced to address the issues.

Final Fix:
The intake camshaft solenoid was replaced. No subsequent issues were observed, and the mechanic mentioned they would monitor the vehicle’s performance for the customer.

Case #4: Subaru

Vehicle Information:
2006 Subaru B9 Tribeca Limited 3.0L

Issue + Repair History:

• Intermittent MIL, which reoccurred after 20,000 miles.
• Initially attributed to low oil level, but the oil level was not low this time.
• Both cam sensors showed the same resistance values.

Suggestions from the Community:

• Possible oil flow condition due to clogging was mentioned, with a recommendation for an engine oil flush.
• Suggested switching the oil control valve from left to right to verify its function.
• A potential issue due to extended intervals using poor quality oil was noted, with a suggestion to use a specific engine oil flush.
• Queries were raised regarding the number of oil changes in the last 20,000 miles and whether 5W-30 oil was consistently used.
• A similar issue was resolved previously with an engine flush and oil change, even when the oil level was full.

Final Fix:
An engine oil flush was performed, and an OEM filter was used. After these actions, the camshaft position and sensors showed improved performance, and the MIL did not reappear.

Case #5: Toyota

Vehicle Information:
2009 Toyota Sienna LE 3.5L

Issue + Repair History:

• The vehicle displayed a CEL Lamp and was diagnosed with P0011, potentially related to the VVT oil control solenoid on bank 1 (intake).
• Despite various checks and replacements, the vehicle continued to show the same issue. After initial checks, the vehicle began idling up to 1200 RPM, then gradually declined and stalled.
• The main concern was thought to be an idle control or PCM issue.

Suggestions from the Community:

• Consider performing a cam/crank correlation procedure.
• Force the vehicle to run and actuate the VVT using a good scanner; if the vehicle slows down, it might be out of time.
• Consider replacing the oil filter and resetting the computer, and performing an idle relearn procedure.
• Check for a separate OCV filter and investigate if the OCV oil supply pipe has a screen inside its holes.
• Ensure no vacuum leaks are present and check the plenum gasket bolts’ sealing.
• Ensure all grounds are connected, especially the two crucial for function.
• Verify if the PCV hose is correctly plugged in, and consider using a smoke machine for further checks.

Final Fix:
The issue was traced back to a faulty ‘Fuel Pump Speed Relay’. After replacing this component, the problem was resolved.