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HOMESERVICE MANUALSCHEVROLET2018TAHOE LT, 4WD, GASREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B3031: SECURITY CONTROLLER IN LEARN MODE (WITH BTM)CIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Tahoe LT, 4WD, Gas

Circuit/System Verification

2018 Chevrolet Tahoe LT, 4WD, GasSECTION Circuit/System Verification
  1. Verify all available keyless entry transmitters are correct for the vehicle. This can be accomplished by comparing the part number that is laser etched on the transmitter to the part number listed in the parts catalog.
    NOTE:

    On some model year vehicles two learned keys are required to add additional keys. If only one learned key is used, this DTC will set. If only one learned key is available then Replacing Keys must be performed.

    • If a transmitter is not correct 

      Replace the transmitter

    • Go to next step: If all transmitters are correct 
  2. Verify the scan tool Immobilizer data displays two or more keys learned to the vehicle.
    • If not 

      Add one additional key

    • If two or more keys are learned to the vehicle 
  3. Perform the Transmitter Programming procedure. Refer to Remote Control Door Lock Transmitter Learn (with BTM) .
  4. Verify the K9 Body Control Module learns the vehicle key and exits learn mode. The scan tool Master Keys Learned parameter should increment to 1.
    • If the K9 Body Control Module does not exit learn mode after the programming attempt 

      Replace the K9 Body Control Module

    • Go to next step: If the K9 Body Control Module exits learn mode after the programming attempt 
  5. All OK.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.