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Diagnose/P0686
P0686Medium SeverityElectrical

Glow Plug Control Module Circuit Malfunction

What This Means

The glow plug control module circuit has a malfunction. This component is part of the engine management system and affects electronic control operations.

Common Symptoms

  • Check engine light on
  • Reduced performance
  • System malfunction
  • Warning lights

Common Causes

  • Failed actuator or module
  • Wiring damage
  • Connector corrosion
  • PCM driver failure
  • Internal component failure

Estimated Repair Cost

$100 – $700
Parts and labor (varies by vehicle and location)
Difficulty:Moderate

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For informational purposes only. Diagnostic trouble codes are starting points for diagnosis, not definitive answers. Always consult a certified mechanic for proper diagnosis and repair. Estimated costs vary by vehicle, location, and shop rates.