P0012 Intake Camshaft Position Timing Over Retarded Bank 1

Definition: The P0012 code indicates that the Engine Control Module (ECM) has detected a problem with the variable valve timing (VVT) system. Specifically, it means that the intake camshaft in bank 1 is not advancing as it should be.

P0012 – Intake Camshaft Position Timing Over Retarded Bank 1

Typical Severity: Moderate

Common Causes

P0012 – Intake Camshaft Position Timing Over Retarded Bank 1

Common causes:

• Incorrect camshaft timing due to a faulty timing chain or belt
• Malfunctioning camshaft phaser or actuator
• Low engine oil level or dirty oil causing poor lubrication
• Faulty camshaft position sensor
• Engine mechanical problems such as a stuck open EGR valve or low compression in the affected cylinder

 

Common Misdiagnosis

OBD2 Code: P0012

Description: Intake Camshaft Position Timing Over-Retarded Bank 1

Common Misdiagnosis: Replacing the camshaft position sensor without checking for issues with the variable valve timing (VVT) system or oil flow problems.

 

Common Diagnostic Steps

OBD2 Code: P0012

Description: Intake Camshaft Position Timing Over-Retarded (Bank 1)

• Check the engine oil level and condition. Ensure it is at the correct level and not contaminated.
• Inspect the camshaft timing solenoid valve for proper operation. Test or replace if necessary.
• Examine the camshaft position sensor for damage or faults. Replace if needed.
• Verify that the timing chain or belt is properly aligned and tensioned.
• Use a scan tool to clear the code and perform a road test to see if it returns.
• If applicable, update the vehicle’s ECU software to the latest version provided by the manufacturer.
• If all else fails, consult with a professional mechanic for further diagnosis as internal engine issues may be present.