U1299 Code – Door Multiplex Control Unit Lost Communication With Climate Control Unit

What are the Possible Causes of the Code U1299?
  • Faulty Climate Control Unit
  • Climate Control Unit harness is open or shorted
  • Climate Control Unit circuit poor electrical connection
  • Faulty Door Multiplex Control Unit
  • 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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