Ignition C Control Signal Circuit/Open

Common symptoms

What you'll notice

• Check and replace any damaged or worn ignition control module or ignition coil.
• Inspect and repair any loose or corroded electrical connections in the ignition control circuit.
• Verify and fix any damaged or faulty wiring or harness in the ignition control signal circuit.
• Test and replace the engine control module (ECM) if all other possible causes have been ruled out.

Common causes

Most likely first

1. Faulty ignition coil
2. Malfunctioning ignition control module
3. Damaged or loose ignition control circuit wiring
4. Defective ignition control module power relay
5. Faulty ignition control module ground connection

How to diagnose & fix

Work through it in order

1. Engine misfires or runs rough
2. Poor fuel efficiency
3. Difficulty starting the engine
4. Engine stalls or shuts off unexpectedly
5. Decreased engine performance or power