B2791 Code – Communication Condition Failure Between ECM

What are the Possible Causes of the Code B2791?
  • Faulty ID Code Box
  • ID Code Box harness is open or shorted
  • ID Code Box circuit poor electrical connection
  • Faulty Engine Control Module (ECM)
  • 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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