Staff Answer
Jun 26, 2026 - 07:34 AM
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Code P0021 refers to "Camshaft Position 'A' Timing Over-Advanced" for Bank 2. This suggests an issue with the Variable Valve Timing (VVT) system controlling the intake camshaft.
Common causes include:
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Contaminated Engine Oil: Sludge buildup can clog the oil passages to the VVT solenoid.
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Faulty Oil Control Valve (OCV): The solenoid may be stuck or electrically failed.
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Timing Chain/Phaser Issues: Worn components affecting mechanical timing.
Quick Steps: First, check your engine oil level and quality; perform an oil change if necessary. If the oil is clean, inspect the Bank 2 VVT oil control valve for debris or damage. Testing the solenoid's electrical resistance is the next logical step.
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