Exhaust Aftertreatment Glow Plug Circuit High
The aftertreatment glow plug current is above expected. Internal short reduces resistance. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Affected components
- Aftertreatment glow plug
Common causes
- High likelihood: Internal short in the glow plug element
- Low likelihood: Supply voltage above specification
- 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
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.