P03FA
Ignition K Control Signal Circuit/Open
Generic OBD-II
Real-world scan data
Seen in
39
scans in the past year
Found in
<0.1%
of scans
<0.1%
of scans that found faults
Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.
Common symptoms
What you'll notice
- Check the wiring and connectors for any loose or damaged connections in the ignition system.
- Inspect the ignition coil for any signs of wear or damage, and replace if necessary.
- Test the ignition control module for proper functioning and replace if faulty.
- Ensure that the ignition switch is functioning correctly and replace if needed.
Common causes
Most likely first
- Faulty ignition coil
- Malfunctioning ignition control module
- Damaged or loose ignition wiring harness
- Faulty ignition switch
- Defective engine control module (ECM)
How to diagnose & fix
Work through it in order
- Engine misfires or stalls
- Difficulty starting the engine
- Decreased fuel efficiency
- Loss of power or acceleration
- Check Engine Light illuminated
Read & clear P03FA yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.