Powertrain
generic / SAE
P06F8
Glow Plug Control Module 2 Control Circuit High
Same as P06F6 with the control line shorted to supply. 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.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number6 / F8
Possible causes
- Control line shorted to supply high
- Connector pins corroded - high contact resistance low
- Supply wire pinched against B+ source low
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
Inspection / repair
- Difficulty: medium
- DIY: possible
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References
sae:J2012