What is the difference between P0011 and P0012?

P0011 means the camshaft is too far advanced; P0012 means it is too far retarded compared with the ECU's command.

Will P0012 clear by itself?

Only if the cause was temporary, such as dirty oil that was changed. If the cause remains, the code returns.

Variable valve timing and engine timing

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

The camshaft on bank 1 is more retarded (later) than the angle the ECU commanded. Valve timing is late, which hurts idle quality, power and emissions.

Severity: Medium

Common causes

Low or dirty engine oil
Faulty or sticking VVT solenoid
Clogged oil passage or solenoid screen
Worn camshaft phaser
Stretched timing chain or slipped timing belt

Symptoms

Rough idle
Loss of power
Poor fuel economy
Check engine light

How to check

Check oil level and quality, and change oil if needed
Test the VVT solenoid and its wiring and connector
Clean the solenoid screen and inspect oil passages
Check cam-to-crank correlation on a scan tool and inspect chain or belt condition

Can you keep driving?

Usually drivable for a short time, but the cause (oil flow or timing drive wear) can become expensive if ignored, so have it checked soon.

Frequently asked questions

What is the difference between P0011 and P0012?: P0011 means the camshaft is too far advanced; P0012 means it is too far retarded compared with the ECU's command.
Will P0012 clear by itself?: Only if the cause was temporary, such as dirty oil that was changed. If the cause remains, the code returns.

General reference information. It does not replace a diagnosis on your own vehicle. The same code can have different causes depending on make, model year and engine; check the manufacturer's documentation or ask a technician with a scan tool.