B2104 Code – Door Passenger Key Cylinder Switch Failure

What are the Possible Causes of the Code B2104?
  • Faulty Door Passenger Key Cylinder Switch
  • Door Passenger Key Cylinder Switch harness is open or shorted
  • Door Passenger Key Cylinder Switch circuit poor electrical connection
  • Faulty Body Control Module (BCM)
  • 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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