P0022: 'A' Camshaft Position - Timing Over-Retarded (Bank 2)
Severity: medium
What it means: The engine computer sees the bank 2 intake (A) camshaft running later than it commanded, so the variable cam timing isn't doing what it's told.
Safe to drive? Usually drivable short term, but get it checked. Ignoring cam timing faults can lead to bigger engine damage.
Common symptoms
- Check-engine light
- Rough idle
- Ticking or knocking from the top of the engine
- Poor power or fuel economy
Likely causes, ranked
- Low or dirty oilDIY
- Sticking variable cam timing (VCT) solenoidDIY
- Worn cam phaserShop
- Stretched timing chainShop
Vehicle-specific notes
- 2005–2014 Ford Expedition: 5.4L 3V cam phaser tick; Ford's erratic cam timing bulletin replaces both VCT solenoids. Read the full answer · Source
What it means: The engine computer sees the bank 2 intake (A) camshaft running later than it commanded, so the variable cam timing isn't doing what it's told.
Severity: Medium. Safe to drive? Usually drivable short term, but get it checked. Ignoring cam timing faults can lead to bigger engine damage.
DIY or shop?
Oil changes and solenoid swaps are DIY on many engines. Phaser and chain work is a shop job.
Before you replace parts
- Check the oil level and make sure it is the correct oil.
- Read all stored codes; P0021 and P0022 often appear together.
- Test the bank 2 VCT solenoid and its wiring.
- Have a shop check for phaser noise or chain stretch before replacing big parts.
Safety / mechanic note
Verify with a mechanic. A loud knock or rough running means stop and get it checked. A code points to a circuit or system, not always a specific part.