P03EF
A Camshaft Profile Actuator C Control Performance/Stuck Off Bank 1
Generic OBD-II
Common symptoms
What you'll notice
- Clean or replace the camshaft profile actuator
- Inspect and clean the camshaft position sensor
Common causes
Most likely first
- Faulty camshaft position sensor
- Engine oil sludge or debris blocking the actuator
- Stuck or malfunctioning camshaft position actuator solenoid
- Timing chain or belt issues
- Electrical wiring or connector problems
How to diagnose & fix
Work through it in order
- Decreased engine performance and power
- Engine misfires or stumbles
- Rough idling or stalling
- Poor fuel economy
- Check engine light illumination
Read & clear P03EF yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.