Ignition F Control Signal Circuit High

Common symptoms

What you'll notice

• Check the ignition coil for any damage or malfunction.
• Inspect and clean the spark plugs, and replace them if necessary.
• Test the ignition control module for any faults and replace if needed.
• Check the wiring and connectors in the ignition system for any loose or damaged connections.
• If all else fails, consider replacing the engine's electronic control unit (ECU).

Common causes

Most likely first

1. Faulty ignition coil
2. Malfunctioning ignition control module
3. Defective ignition switch
4. Damaged or loose wiring connection in the ignition system
5. Faulty engine control module (ECM)

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Loss of power or acceleration
3. Increased fuel consumption
4. Rough idling or stalling
5. Difficulty starting the engine or intermittent starting issues