DTC code
P0021
A Camshaft Position - Timing Over-Advanced or System Performance Bank 2
Technical guide
Symptoms
- Check Engine Light
- Hard start of the engine
- Rough running engine
- Stalling
- Rattling/Knocking from engine
- Decreased fuel economy
- Failed emissions test
Probable causes
- Engine oil is dirty
- Engine oil is too low
- Engine oil is incorrect viscosity
- Camshaft variable valve timing control solenoid failure
- Camshaft phaser is seized in the advanced position
- Continuous oil flow to Variable Camshaft Timing chamber
Diagnostic steps
- Use FIXD to check if there are any other codes along with P0021.
- Check the engine oil level and condition. If it's low, adjust to spec and test drive.
- Remove the oil cap and/or the valve cover and inspect the valve train for sludge.
- Consider checking the Bank 2 Intake Camshaft Oil Control Valve for proper function by testing solenoid response.
- If the vehicle is still setting the same code, bring the vehicle to a certified shop.
Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.
Models most reported with this code (NHTSA)
Count of distinct owner complaints mentioning the code. US data — same engines, same failures.
AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.
0 confirmed cases on P0021
Nothing confirmed yet for this code. No guess is offered on purpose.
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