P0012
Medium SeverityIntake Camshaft Position Timing Over-Retarded (Bank 1)
Engine System
P0012 — Instant Answer
Intake Camshaft Position Timing Over-Retarded (Bank 1)
Severity: MEDIUM SEVERITY
Meaning: The intake camshaft on bank 1 is more retarded than commanded by the ECM. This reduces engine performance and efficiency. Often related to oil viscosity issues or a failing VVT actuator.
Safe to drive? Usually yes with caution, but confirm root cause before long trips.
Estimated repair cost: $30 - $150
Most common causes:
- 1. Low or dirty engine oil (35-45% of cases)
- 2. Faulty VVT solenoid (35-45% of cases)
- 3. Worn timing chain (10-25% of cases)
- 4. Incorrect oil viscosity (10-25% of cases)
Symptoms
- ⚠️Loss of power
- ⚠️Poor fuel economy
- ⚠️Rough idle
- ⚠️Failed emissions test
Related Symptoms
Common Causes
How to Diagnose P0012
- 1Verify oil level and condition
- 2Check VVT solenoid operation
- 3Inspect timing chain for stretch
- 4Verify correct oil viscosity is being used
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Related Codes
The engine computer cannot control the variable valve timing solenoid on bank 1. This affects engine performance and fuel economy. Usually caused by a faulty VVT solenoid or wiring issue.
The intake camshaft on bank 1 is more advanced than the ECM commanded. This typically means the VVT system is stuck or the oil flow is restricted. Often caused by dirty oil or a stuck VVT solenoid.
The ECM detected a fault in the exhaust camshaft VVT solenoid circuit on bank 1. This solenoid controls exhaust valve timing for optimal performance and emissions.
Frequently Asked Questions
- What causes P0012?
- P0012 is most commonly caused by dirty or low engine oil, a failing VVT solenoid, or a stretched timing chain.
- Can I drive with P0012?
- You can drive but expect reduced power and worse fuel economy. Fix it promptly to avoid potential timing chain issues.
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Author & Review
Written by AllOEMManuals Editorial Team. Reviewed by ASE-certified technicians and updated with factory-reference checks for fitment-sensitive steps.
This guide was drafted with AI assistance and reviewed for accuracy by a human editor.
Last updated: 2026-05-07