OBD-II code · Powertrain (generic)
P0012 "A" Camshaft Position - Timing Over-Retarded (Bank 1)
The bank 1 intake camshaft remains retarded compared to commanded position. Common causes include a stuck-closed oil control valve, blocked oil passages, or a worn cam phaser.
Is it safe to drive with P0012?
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 (retard position)
- PossibleCam phaser internally worn
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
- 0.5–5 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, Cam Phaser
Related codes
- P0011"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
- P0015"B" Camshaft Position - Timing Over-Retarded (Bank 1)
- P0022"A" Camshaft Position - Timing Over-Retarded (Bank 2)
- P0025"B" Camshaft Position - Timing Over-Retarded (Bank 2)
- P000FFuel System Over Pressure Relief Valve Activated
- P0010"A" Camshaft Position Actuator Circuit (Bank 1)
- P0013"B" Camshaft Position Actuator Circuit (Bank 1)
- P0014"B" Camshaft Position - Timing Over-Advanced (Bank 1)
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.