Ignition B Control Signal Circuit High

Common symptoms

What you'll notice

• Check for any loose or damaged wiring connections in the ignition system.
• Inspect the ignition coil and replace if necessary.
• Test the ignition control module and replace if malfunctioning.
• Check the spark plugs and replace if worn or fouled.
• If all else fails, consider replacing the engine control module (ECM).

Common causes

Most likely first

1. Faulty ignition coil
2. Wiring or connector issues in the ignition system
3. Malfunctioning ignition control module
4. Defective ignition switch
5. Faulty engine control module (ECM)

How to diagnose & fix

Work through it in order

1. Engine misfiring or hesitation during acceleration
2. Rough idling or stalling of the engine
3. Difficulty starting the vehicle
4. Poor fuel efficiency
5. Illuminated check engine light