B0408 Code – Main Temperature Control Circuit

What are the Possible Causes of the Code B0408?
  • Faulty Air Temperature Actuator
  • Air Temperature Actuator harness is open or shorted
  • Air Temperature Actuator 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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