Question 1

What does P0021 mean?

Accepted Answer

P0021 - Camshaft Position — Timing Over-Advanced (Bank 2). Intake camshaft on bank 2 is more advanced than commanded.

Question 2

What are the symptoms of P0021?

Accepted Answer

Check engine light, Rattle on cold start, Rough idle

Question 3

What causes P0021?

Accepted Answer

Worn cam phaser bank 2, Low oil level, Dirty oil, Stuck VVT solenoid, Timing chain stretch

Question 4

How much does it cost to fix P0021?

Accepted Answer

Typical repair cost: $100-$2,000. If P0011 and P0021 appear together (both banks), suspect low oil level or timing chain issues.

P0021 — Camshaft Position — Timing Over-Advanced (Bank 2)

Don't guess — diagnose P0021 the right way