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HOMESERVICE MANUALSCHEVROLET2018TAHOE LT, 4WD, GASREPAIR AND DIAGNOSISBODY & FRAMEIGNITION SWITCH/STEERING LOCKIMMOBILIZER SYSTEMDIAGNOSTIC INFORMATION AND PROCEDURESDTC B389A: ENVIRONMENT IDENTIFICATIONCIRCUIT/SYSTEM VERIFICATION
2018 Chevrolet Tahoe LT, 4WD, Gas

Circuit/System Verification

2018 Chevrolet Tahoe LT, 4WD, GasSECTION Circuit/System Verification
  1. Verify DTC B389A did not set immediately following the replacement and programming of the K9 Body Control Module.
    • Go to next step: If the DTC did not set immediately after the replacement and programming of the K9 Body Control Module 
  2. Perform the K9 Body Control Module immobilizer learn using body control module IMMO Function with Existing Transponder or Remote Key in SPS. Refer to Immobilizer System Component Programming (without BTM) , or Immobilizer System Component Programming (with BTM) .
  3. Verify DTC B389A does not set after programming.
    • If the DTC sets after programming 

      Replace the K9 Body Control Module.

    • Go to next step: If the DTC does not set after programming 
  4. All OK.
RENDER: 1.0x

NO RELATED

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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.