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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Body & Frame >> Ignition Switch/Steering Lock >> Immobilizer System >> Diagnostic Information and Procedures >> DTC B3935: Transponder Authentication Error >> Circuit/System Verification

Circuit/System Verification

  1. Replace the suspected inoperative or malfunctioning transmitter.
  2. Verify DTC B3935 is not set as current.
    • If the DTC is set as current 

      Replace the K9 Body Control Module.

    • If the DTC is set as history 
  3. All OK.
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