P030C
Ignition A Control Signal Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace faulty ignition coil
- Inspect and repair damaged or loose wiring in the ignition system
- Clean or replace spark plugs
- Check and replace faulty ignition control module
Common causes
Most likely first
- Faulty ignition coil or spark plugs
- Issues with the ignition control module or ignition control unit
- Wiring or connection problems in the ignition system
- Malfunctioning Engine Control Unit (ECU) or Powertrain Control Module (PCM)
How to diagnose & fix
Work through it in order
- Engine misfires or runs rough
- Decreased fuel efficiency
- Difficulty starting the engine
- Illuminated check engine light
- Poor acceleration or lack of power
Read & clear P030C yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.