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U1178 Code – Invalid or Missing Data For Climate Control

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What are the Possible Causes of the Code U1178?
  • Faulty Heating, Ventilation, and Air-Conditioning (HVAC) Module
    • Heating, Ventilation, and Air-Conditioning (HVAC) Module harness is open or shorted
  • Heating, Ventilation, and Air-Conditioning (HVAC) Module circuit poor electrical connection

  • Need help with this OBD II code? Our mechanics are available within west Michigan to help. Outside of our service area? Visit our Car Help Section where you can ask questions and get answers.

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