P030E
Ignition B Control Signal Circuit Low
Generic OBD-II
Common symptoms
What you'll notice
- Check and replace the ignition coil if necessary
- Inspect and repair the ignition wiring harness for any loose or damaged connections
- Clean or replace the spark plugs to ensure proper ignition
- Verify and adjust the ignition timing if required
Common causes
Most likely first
- Faulty ignition coil
- Shorted or open wiring in the ignition system
- Malfunctioning ignition module
- Issue with the ignition switch
- Problem with the engine control module (ECM)
How to diagnose & fix
Work through it in order
- Engine misfires or stumbles during acceleration.
- Difficulty starting the vehicle.
- Rough idle or fluctuations in engine RPM.
- Poor fuel efficiency.
- Engine hesitation or lack of power.
Read & clear P030E yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.