Exhaust Aftertreatment Glow Plug Control Circuit / Open
The control line for the aftertreatment glow plug (used on some diesels to ignite injected HC during DPF regeneration) is open. Active regeneration cannot start.
Affected components
- Aftertreatment glow plug
- Control module
- Wiring harness
Common causes
- High likelihood: Open coil in glow plug control relay
- Medium likelihood: Broken control wire
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
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.