P0012 - Camshaft Position 'B' Timing Over-Retarded (Bank 1)
Plain-English meaning
The engine control module (ECM) has detected that the camshaft timing for the exhaust camshaft on bank 1 is more retarded than expected.
What to check first
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What not to replace yet
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Stop driving when
If the engine runs very rough, stalls frequently, or if there is a noticeable loss of power that compromises safety, stop driving and seek professional inspection.
Related symptoms
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Owner steps
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Likely causes
Faulty variable valve timing (VVT) solenoid or actuator (medium)
Low or dirty engine oil affecting VVT operation (medium)
Faulty camshaft position sensor (medium)
Timing chain or belt issues (medium)
Wiring problems or poor electrical connections to the VVT solenoid (medium)
ECM software or hardware faults (medium)
Shop steps
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Follow-up questions
Has there been recent engine oil changes or maintenance?
Are there any unusual engine noises or performance issues?
Is the check engine light steady or flashing?
Have any repairs been attempted related to the timing system?