P030B
Ignition A Control Signal Circuit Low
Generic OBD-II
Common symptoms
What you'll notice
- Check the wiring and connections of the Ignition A Control Signal Circuit.
- Inspect and test the Ignition A Control Module for any faults or malfunctions.
- Verify the condition of the ignition coil and replace if necessary.
- Ensure that the ignition spark plugs are in proper working condition and clean or replace if needed.
Common causes
Most likely first
- Faulty ignition coil
- Problem with ignition control module
- Wiring issue in the ignition system
- Faulty ignition switch
- Malfunctioning engine control unit
How to diagnose & fix
Work through it in order
- Engine misfire or hesitation
- Reduced power or loss of power
- Rough idling or stalling
- Difficulty starting the engine
- Decreased fuel efficiency
Read & clear P030B yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.