Glow Plug Module Control Module Power Circuit Low
The diesel glow plug control module reports a power-supply voltage below the operating threshold. Glow plug heating may be partially or fully disabled, causing hard cold start.
Affected components
- Glow plug control module
- Glow plug relay
- Battery
Common causes
- High likelihood: Weak battery / poor charging
- Medium likelihood: Voltage drop in module supply
- Low likelihood: Connector pins corroded - high contact 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
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.