Glow Plug Control Module 1 System Voltage
Glow Plug Control Module 1 System Voltage: the control module has detected this fault condition. This affects diesel cold-start preheating.
Affected components
- Glow plug control module 1
- Glow plug supply relay
Common causes
- High likelihood: Supply voltage low
- Medium likelihood: Supply relay contact high resistance
Possible symptoms
- Glow plug warning light on (often orange coil symbol)
- Hard cold start or no start in cold weather
- White smoke from exhaust during warm-up
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.