P0012 Code: Meaning, Causes and Repair Cost

The intake camshaft on bank 1 is lagging behind where the computer wants it (retarded). The part that turns the camshaft relies on engine oil pressure, so low, old or wrong oil is the first suspect. A sticking oil control valve, a worn cam phaser or a stretched timing chain are the others.

How the engine computer detects it

The engine control module compares the commanded position of the intake camshaft on bank 1 with the actual position from the camshaft and crankshaft sensors. This code is set when the camshaft stays further retarded than commanded for longer than a calibrated time. Usually the phaser does not move far enough out of its rest position, because oil pressure is too low to release the locking pin, the oil control valve does not open, or the oil screen is blocked. A stretched timing chain also shifts the camshaft towards retarded. Bank 1 is the cylinder bank that contains cylinder 1.

Written from public technical sources and not yet checked by a mechanic. How we write these pages

Symptoms

Check engine light on
Noticeably less torque and pulling power
Higher fuel consumption
Harder starting in some cases
Rattle from the timing drive if the chain is stretched

Common causes

Oil pressure or oil level too low, oil worn out Most likely
Oil control valve sticking closed or its screen blocked Most likely
Cam phaser defective or seized in its rest position Possible
Timing chain stretched or jumped a tooth Possible
Wear debris in the oil circuit, e.g. from a thrust bearing Less likely

How to diagnose P0012

Check the oil level right away and top up if needed. If an oil change is due, change oil and filter using the viscosity in your owner's manual.
Clear the code and drive for a few days. If it doesn't come back, the oil was likely the cause.
Remove the bank 1 intake oil control valve and check its screen for sludge or debris. Metal particles mean something inside the engine is wearing, so have a shop look further.
If the code persists, have oil pressure measured with a gauge. Low pressure can't move the cam phaser.
Listen for a rattle at cold start and check for P0008 or P0016. Either points toward the timing chain.
If the phaser is stuck, it needs replacing, often together with the timing chain.

Vehicles that report P0012 most

Vehicle	Years	Reports	Median miles
Ford Escape	2009–2019	16	63k
Nissan Rogue	2022–2023	6	76k
Ford F-150	2004–2016	3	—
Ford Ecosport	2018–2021	3	—

Counts of owner complaints to the NHTSA that mention P0012 (46 in total), not failure rates: popular models get more complaints simply because more of them are on the road. Models with fewer than 3 complaints are left out.

Reading the code

P: Powertrain
0: Generic (SAE) code
0: Fuel and air metering, auxiliary emission controls
12: Specific fault

Questions drivers ask

Can I drive with code P0012?

Yes, for short trips, but check the oil level before you go. The engine will feel weaker and use more fuel. If the oil pressure light comes on or you hear loud rattling or knocking, stop the engine and don't drive further.

Will my car pass an emissions inspection with P0012?

Probably not in states that test vehicles with an OBD-II scan: an emissions-related code that keeps the check engine light on is usually an automatic fail. Rules differ by state and county, so check yours.

Will P0012 clear by itself?

The light can go off after several drive cycles without the fault, but the code returns if the cause is still there. After a repair, the readiness monitors need a full drive cycle before an inspection.

Can I fix P0012 myself?

Often yes, with an OBD-II scanner and basic tools. Difficulty: medium. Start with the cheapest checks before replacing expensive parts.

Often reported together

Codes that owners mention in the same NHTSA complaints as P0012. They can point to a shared cause, so it's worth checking them together.

P0012 "A" Camshaft Position - Timing Over-Retarded (Bank 1)

What P0012 means