P03FC
Ignition K Control Signal Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace faulty ignition coil or ignition control module
- Inspect and repair damaged or loose wiring connections in the ignition system
- Clean or replace spark plugs
- Verify and adjust ignition timing
Common causes
Most likely first
- Faulty ignition coil
- Malfunctioning ignition control module
- Damaged or worn spark plugs
- Issues with the ignition switch or wiring
- Faulty engine control module (ECM)
How to diagnose & fix
Work through it in order
- Engine misfire
- Poor acceleration
- Difficulty starting the vehicle
- Stalling or intermittent loss of power
- Illumination of the check engine light
Read & clear P03FC yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.