P0011: Your engine's variable valve timing is stuck too far advanced
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
Keep any driving brief and gentle, but check your oil first. Low oil often causes this, and that risks bigger engine damage. If you hear knocking or rattling from the front of the engine, or it stalls or runs badly, stop and get it towed.
What it means
Modern engines rotate the camshaft to adjust valve timing. Engine oil pushes on a phaser, and an oil control solenoid controls it. P0011 means the intake ("A") camshaft on Bank 1 stayed more advanced than the computer commanded. Because oil drives the whole system, this is a performance and mechanical fault, not an electrical sensor problem. Most of the time it is an oil issue, not a broken part. The classic mistake is throwing a camshaft sensor or solenoid at it before checking the oil. Check the oil level, condition, and viscosity before anyone replaces a single part.
Common causes
- Low, dirty, or wrong-viscosity engine oil starving the timing systemThe most common real fix. Forums show cases cured by topping up oil (one was 2 quarts low) or switching to the correct spec oil.
- Stuck or clogged oil control solenoid (intake cam, Bank 1)Sludge clogs the solenoid's filter screen so the plunger can't move. Often the fix when fresh oil alone doesn't clear it.
- Camshaft phaser stuck in the advanced positionLess common than oil or solenoid issues, but real on high-mileage engines and known-problem platforms like the Ford 5.4.
- Stretched timing chain or worn tensioner and guidesNotorious on GM 2.4L Ecotec engines, where oil burning drops the level and stretches the chain.
- Faulty camshaft position sensor or wiringFrequently replaced but rarely the true cause. A bad sensor usually sets a P0340-series circuit code instead of this one.
What it costs
- Oil and filter change with correct-spec oil$58 to $235
- Oil control solenoid replacement$150 to $450
- Camshaft position sensor replacement$120 to $350
- Camshaft phaser replacement$500 to $900
- Timing chain replacement$900 to $2,500
Symptoms
- Check engine light
- Hard starting or long cranking
- Rough idle, hesitation, or stalling
- Less power and worse fuel economy
- Rattling or ticking from the front of the engine
- Failed emissions test
What to do next
Do not buy parts yet. Check the oil level, condition, and viscosity first. If it is low, dirty, or the wrong type, do a fresh oil and filter change with the exact manufacturer spec ($58 to $235). If the code stays, pull and inspect the intake oil control solenoid and clean its filter screen of sludge ($150 to $450). Only after that should you look at the phaser ($500 to $900) or timing chain ($900 to $2,500). Check for a technical service bulletin first, since GM, Nissan, and Ford have known P0011 bulletins.
Lewis reads this code plus the live camshaft timing and oil-related data, so you can see whether the cam is truly stuck advanced. Download Lewis.
Related codes
FAQ
- Will an oil change fix P0011?
- Often, yes. Low, dirty, or wrong-viscosity oil is the top cause, and this system runs on oil pressure. Forums document cases cured by topping up oil or switching to the exact manufacturer-spec oil. Start with an oil and filter change before replacing any parts.
- Can I keep driving with a P0011 code?
- Keep any driving brief and gentle, and check the oil right away. If low oil caused it, you also risk broader engine damage. Prolonged driving can harm the valve train. Stop and get it towed if you hear knocking or rattling, or if it stalls or runs badly.
- How much does it cost to fix P0011?
- An oil and filter change runs $58 to $235. An oil control solenoid is $150 to $450. A camshaft phaser is $500 to $900. A stretched timing chain is $900 to $2,500. Most cases are fixed at the cheap end with oil.