Ignition F Control Signal Circuit/Open

Common symptoms

What you'll notice

• Check the ignition fuse and replace if necessary.
• Inspect the ignition coil for any signs of damage or corrosion and replace if needed.
• Test the ignition control module for proper functioning and replace if it fails the test.
• Check the wiring and connections in the ignition system for any breaks or loose connections and repair as needed.
• In rare cases, the engine control module (ECM) may need to be replaced if all other solutions have been exhausted.

Common causes

Most likely first

1. Faulty ignition coil
2. Malfunctioning ignition control module
3. Loose or corroded wiring connections in the ignition system
4. Defective ignition switch

How to diagnose & fix

Work through it in order

1. Engine misfires or stutters during acceleration or idle
2. Decreased engine performance and power
3. Rough or uneven engine idling
4. Difficulty starting the engine
5. Illumination of the check engine light