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Home >> Chevrolet >> 2018 >> Spark LT, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B3935: Transponder Authentication >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2017 Chevrolet Spark. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition ON.
  2. Verify the scan tool Immobilizer Allows Engine to Start parameter is Valid when using each vehicle key.
    • If Authentication Error 
      NOTE:

      Perform the appropriate key procedures for this vehicle. Not all vehicle models and years are the same.

      Replace the keys.

    • If Valid 
  3. Verify DTC B3935 does not set while operating the vehicle under the conditions for running the DTC.
    • If the DTC is set 

      Replace the K9 Body Control Module.

    • If the DTC is not set 
  4. All OK.
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