P0012
Medium SeverityIntake Camshaft Position Timing Over-Retarded (Bank 1)
Engine System
What Does P0012 Mean?
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.
Common Fix
Replace VVT solenoid and change oil
Estimated Cost (DIY)
$30 - $150
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
OEM Diagnostic Flowchart
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Related Resources
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OEM Manual Evidence
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Related Symptoms
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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.
Related Repair Guides
If your vehicle has triggered P0012, these DIY repair guides may help: