P0021 A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)
What does P0021 mean?
P0021 — A Camshaft Position - Timing Over-Advanced or System Performance (Bank 2) (bank 2). This is an OBD-II diagnostic trouble code a scanner retrieves when your vehicle's computer detects a camshaft position - timing over-advanced or system performance (bank 2) on bank 2. The level of risk depends on how the vehicle is currently running and how long you've been driving with the light on.
Common causes of P0021
- Stuck or sluggish bank 2 VVT oil control valve
- Gummed-up intake phaser
- Low or dirty engine oil
- Timing chain stretch
How to fix P0021
- Verify oil level, condition, and pressure
- Compare commanded vs actual bank 2 cam position
- Clean or replace the oil control valve
- Inspect the phaser and timing chain
- Replace worn components and retest