P030D
Ignition B Control Signal Circuit/Open
Generic OBD-II
Common symptoms
What you'll notice
- Check the ignition coil for any signs of damage or malfunctions.
- Inspect the ignition control module for any loose connections or faulty wiring.
- Verify the spark plug wires for any signs of wear or damage, and replace if necessary.
Common causes
Most likely first
- Faulty ignition coil or ignition control module
- Loose or corroded wiring connections in the ignition system
- Defective ignition switch
- Faulty Engine Control Unit (ECU) or Powertrain Control Module (PCM)
- Incorrect ignition timing or misfiring spark plugs
How to diagnose & fix
Work through it in order
- Engine misfire or hesitation
- Reduced engine power or performance
- Difficulty starting the engine
- Stalling or engine cut
- off while driving
- Illumination of the check engine light
Read & clear P030D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.