P038F
Ignition J Control Signal Circuit High
Generic OBD-II
Common symptoms
What you'll notice
- Check the ignition coil for any loose connections or damage.
- Inspect the ignition control module for any faults or malfunctions.
- Test and replace the ignition switch if necessary.
- Check the wiring harness for any breaks or shorts in the ignition circuit.
- Replace the Engine Control Module (ECM) if all other components are functioning properly.
Common causes
Most likely first
- Problem with the ignition coil
- Faulty ignition control module
- Issue with the ignition switch
- Problem with the ignition timing
- Faulty spark plugs
How to diagnose & fix
Work through it in order
- Engine misfire or stuttering
- Poor acceleration or sluggish response
- Difficulty starting the vehicle
- Poor fuel efficiency
- Illumination of the Check Engine Light
Read & clear P038F yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.