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P06F6

Glow Plug Control Module 2 Control Circuit Open

The control circuit driving glow plug control module 2 is open. 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.

  • Check engine light: Yes
  • Emissions related: Yes
  • Repair difficulty: medium

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

Common causes

Ordered by how often each turns out to be the cause.

  • Open in control wiringCommon
  • Pin pushed back out of connector bodyLess likely
  • Cracked solder joint inside the module or sensorLess likely

Parts involved

  • Glow Plug Control Module 2

P06F6 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.