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U1525 Code – HVAC Control Module Lost Communication With Coolant Heater Control Module On LIN Bus

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What are the Possible Causes of the Code U1525?
  • Faulty Coolant Heater Control Module
    • Coolant Heater Control Module harness is open or shorted
  • Coolant Heater Control Module circuit poor electrical connection
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module

    • 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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