Glow Plug Control Module 2 System Voltage

Common symptoms

What you'll notice

• Check the glow plug control module for any loose or damaged connections
• Test the system voltage to ensure it is within the specified range
• Replace the glow plug control module if it is determined to be faulty
• Inspect the glow plugs for any signs of damage or wear and replace if necessary
• Verify the wiring harness and connections for any faults or damage, and repair as needed

Common causes

Most likely first

1. Weak or malfunctioning glow plugs
2. Faulty glow plug control module
3. Electrical issues or low voltage in the system
4. Malfunctioning engine control unit (ECU) or engine management system
5. Faulty wiring or connectors in the glow plug control circuit

How to diagnose & fix

Work through it in order

1. Difficult or slow engine start
2. Engine misfires or runs rough
3. Decreased fuel efficiency
4. Illuminated or flashing check engine light
5. Potential loss of engine power