Glow Plug Control Module 2 Control Circuit Low

Common symptoms

What you'll notice

• Check the glow plug control module wiring for any loose or damaged connections.
• Inspect the glow plug control module for any signs of moisture or corrosion and clean or replace if necessary.
• Test the glow plug control module voltage with a multimeter to ensure it is within the proper range.
• Check the glow plugs themselves for any damage or wear and replace as needed.
• If all else fails, consider replacing the entire glow plug control module.

Common causes

Most likely first

1. Faulty glow plug control module
2. Loose or corroded electrical connections
3. Faulty glow plugs
4. Defective engine control unit (ECU)
5. Low battery voltage

How to diagnose & fix

Work through it in order

1. Difficult or slow engine start
2. Illuminated glow plug warning light on the dashboard
3. Poor engine performance or reduced power
4. Increased black smoke from the exhaust
5. Increased fuel consumption