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Diagnose/P0689
P0689Medium SeverityElectrical

Glow Plug Control Module Circuit High Input

What This Means

The glow plug control module voltage is above maximum threshold. 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.