P0012 — "A" Camshaft Position – Timing Over-Retarded (Bank 1)
Category: Powertrain Severity: Medium
Updated:
DTC code P0012 means: "A" Camshaft Position – Timing Over-Retarded (Bank 1). It falls under the "Powertrain" category, with an estimated severity of Medium. Common causes include vVT solenoid stuck open, wrong oil viscosity or low oil level and seized camshaft phaser; it's worth confirming the diagnosis before replacing parts.
Possible causes
- VVT solenoid stuck open
- Wrong oil viscosity or low oil level
- Seized camshaft phaser
- Timing chain out of time
Symptoms
- Hard starting
- Rough idle
- Lack of power
- Check engine light
How to diagnose it step by step
- Check the oil (level, viscosity, age).
- Clean or replace the VVT solenoid.
- Compare actual vs desired cam position on the scan tool.
- Check the timing marks.
How to fix it
Same approach as P0011: correct oil first, then the VVT solenoid. If timing remains retarded, check chain timing.
Estimated repair cost
VVT solenoid: $120–300 installed. Phaser or chain: $600–2,000.
Frequently asked questions
What does DTC code P0012 mean?
"A" Camshaft Position – Timing Over-Retarded (Bank 1).
Is code P0012 serious?
Severity Medium. Not urgent, but worth diagnosing to avoid bigger damage.
Can I keep driving with code P0012?
Drive only as needed until it is checked, especially if you hear chain noise.
Related codes
P0011 P0013 P0010 P0014 P0016 P0017 P0018 P0019 P0008 P0021
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