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Diagnose/B0402
B0402Medium SeverityBody

Exterior Lighting Circuit Circuit Low C

What This Means

The exterior lighting circuit circuit low has been detected. This body control module code affects the body system component operation.

Common Symptoms

  • System malfunction
  • Exterior Lighting Circuit not working
  • Warning light on
  • Reduced functionality

Common Causes

  • Failed exterior lighting circuit component
  • Wiring damage
  • Connector corrosion
  • BCM circuit failure
  • Mechanical obstruction

Estimated Repair Cost

$50 – $300
Parts and labor (varies by vehicle and location)
Difficulty:Easy

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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.