Cylinder 12 Glow Plug Circuit Open
The glow plug circuit on cylinder 12 is open - usually a broken connection or burnt-out heater element.
Affected components
- Glow plug cyl 12
Common causes
- High likelihood: Plug element burnt out
- Low likelihood: Pin pushed back out of connector body
- Low likelihood: Cracked solder joint inside the module or sensor
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.