OBD-II code · Powertrain (generic)
P0021 "A" Camshaft Position - Timing Over-Advanced (Bank 2)
The bank 2 intake camshaft is more advanced than commanded, or the actuator does not respond as expected. Often caused by stuck-open oil control valves, sludge in VVT passages, or low oil pressure.
Is it safe to drive with P0021?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOil control valve stuck (advance)
- PossibleSludge in VVT passages
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–4 h
- Emissions test
- Likely to fail
- After the fix
- A drive cycle is needed before the light stays off
- Parts involved
- Camshaft Position Actuator, Oil Control Valve
Related codes
- P0011"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
- P0014"B" Camshaft Position - Timing Over-Advanced (Bank 1)
- P0024"B" Camshaft Position - Timing Over-Advanced (Bank 2)
- P001EA Camshaft Profile Actuator A Control Circuit Low Bank 2
- P001FA Camshaft Profile Actuator A Control Circuit High Bank 2
- P0020"A" Camshaft Position Actuator Circuit (Bank 2)
- P0022"A" Camshaft Position - Timing Over-Retarded (Bank 2)
- P0023"B" Camshaft Position Actuator Circuit (Bank 2)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.