P0011: Camshaft Position A - Timing Over-Advanced (Bank 1)
P0011 means the intake camshaft on Bank 1 is more advanced than the engine computer commanded. Variable valve timing uses oil pressure to rotate the camshaft; when the actual position does not match the target, this code is set. Oil condition is very often the root cause.
Can I still drive with P0011?
Only if it runs smoothly, and not far
Incorrect valve timing can cause valves and pistons to contact each other on some engines, which is catastrophic. If the engine is rattling loudly, running very roughly or losing significant power, stop and have it towed. A rattle from the front of the engine on start-up deserves immediate attention.
What you will actually notice
- Rough idle, sometimes stalling
- Noticeable loss of power
- Rattling from the front of the engine, especially on start-up
- Check engine light
- Worse fuel economy
Causes, ordered by how often they turn out to be the fault
1.Dirty, degraded or wrong-viscosity engine oil
Very commonVariable valve timing runs on oil pressure. An overdue oil change is a genuine and cheap cause.
2.Clogged variable valve timing oil control screen or passage
Very commonSludge blocks the control circuit.
3.Faulty oil control valve or solenoid
CommonSticks and holds the camshaft advanced.
4.Failing camshaft phaser or actuator
CommonRattle on start-up is the classic sign.
5.Low oil level or low oil pressure
CommonCheck the dipstick before anything else.
6.Timing chain stretch or jumped timing
Less commonUsually joined by correlation codes.
7.Wiring fault at the oil control valve
RareInspect the connector.
How to diagnose it, cheapest test first
Work down this list in order. The most expensive mistake with this code is replacing a costly part before ruling out a cheap one.
- 1
Check oil level and condition
FreeBlack, thick or low oil is a genuine cause of this code, not a formality.
- 2
Change the oil and filter with the correct specification and viscosity
LowUsing the wrong viscosity alone can set this code. On many engines this is the whole repair.
- 3
Inspect and clean the variable valve timing oil control screen
Low to moderateA blocked filter screen is common and cheap to address if reachable.
- 4
Test the oil control valve electrically and for free movement
ModerateSticking valves can sometimes be cleaned.
- 5
Verify actual camshaft timing against commanded on a scan tool
ModerateShows how far off the phaser really is.
- 6
Inspect the timing chain and phaser
HighThe expensive outcome, and the reason the cheap oil checks come first.
What the repairs typically cost
| Repair | Estimated range |
|---|---|
| Oil and filter change with correct specificationFrequently the entire fix. Always the first thing to do. | $50 – $150 |
| Oil control valve or solenoid replacementAccess varies by engine. | $150 – $500 |
| Variable valve timing screen cleaning or replacementDepends heavily on how buried it is. | $150 – $600 |
| Camshaft phaser replacementSubstantial labour on most engines. | $600 – $2,000 |
| Timing chain replacementThe worst case for this code. | $1,000 – $3,000 |
Estimate only. Ranges vary widely by region, vehicle and shop rate, and are not quotes. Always get a written estimate before authorising work.
Notes for specific makes
Nissan / Infiniti
A well-known code on several engines, where the oil control valve and timing chain components are common causes.
Hyundai / Kia
Oil maintenance history matters greatly here. Check service records before assuming mechanical failure.
Toyota
The variable valve timing filter screen is a known blockage point and comparatively cheap to service.
General Motors
Timing chain stretch on some four-cylinder engines produces this code alongside correlation codes.
Common questions
Can an oil change really fix P0011?
Yes, more often than drivers expect. Variable valve timing is controlled hydraulically by engine oil, so dirty, low or wrong-viscosity oil genuinely causes this code. Always try this first.
Is P0011 serious?
It can be. Valve timing that is significantly out can cause internal engine damage on some designs, and a start-up rattle suggests worn phaser components. Do not leave it for months.
What does "Bank 1" mean here?
Bank 1 is the cylinder bank containing cylinder number one. On an inline engine there is only one bank.
Why is there a rattle when I start the engine?
The phaser relies on oil pressure to stay locked. When it or the tensioner is worn, it rattles for a second or two on start-up before pressure builds.
Not sure which of these applies to your car?
Describe what the car is actually doing and get a diagnosis narrowed to your vehicle, or find a shop near you.
AI-generated and informational only. This is not a diagnosis of your specific vehicle and does not replace inspection by a qualified technician.