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U1890 Code – Hybrid Control Module Lost Communication With HVAC Control Module

What are the Possible Causes of the Code U1890?
  • Faulty Heating, Ventilation, and Air Conditioning (HVAC) Control Module
  • HVAC Control Module harness is open or shorted
  • HVAC Control Module circuit poor electrical connection
  • Faulty Hybrid Control Module (HCM)
  • 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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