Glow Plug/Heater Circuit A Malfunction

What This Means

The glow plug heating circuit A has malfunctioned. This affects cold-start performance on diesel engines.

Common Symptoms

Hard cold starting
White smoke
Rough cold idle
Glow plug warning light

Common Causes

Burned out glow plug
Relay failure
Wiring issue
Controller failure
Connector corrosion

Estimated Repair Cost

$100 – $600

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.