B1128 – Driver Side Door Lock Switch Signal Error

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What are the Possible Causes of the Code B1128?
  • Faulty Driver Side Door Lock Switch
    • Driver Side Door Lock Switch harness is open or shorted
  • Driver Side Door Lock Switch 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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