P030A
Ignition A Control Signal Circuit/Open
Generic OBD-II
Common symptoms
What you'll notice
- Check for loose or damaged wiring connections in the ignition system
- Inspect and replace the ignition coil if necessary
- Clean or replace the spark plugs
- Verify the condition of the ignition control module and replace if needed
- Troubleshoot the Engine Control Unit (ECU) for any faults related to the ignition system
Common causes
Most likely first
- Faulty ignition coil
- Loose electrical connection in the ignition system
- Malfunctioning ignition control module
- Faulty ignition switch
- Defective ignition control relay
How to diagnose & fix
Work through it in order
- Engine misfire or hesitation
- Poor fuel economy
- Engine stalling
- Difficulty starting the vehicle
- Illuminated check engine light
Read & clear P030A yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.