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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 214 (Electronic Transmission Range Select) >> Diagnostic Information and Procedures >> DTC B2B9B >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.
  1. Verify there are no communication DTCs set.
    • Go to next step: If there are no communication DTCs set 
  2. Check for updated software in K212 Gear Shift Control Module.
    • If software is not current 

      Perform the programming for the K212 Gear Shift Control Module.

    • Go to next step: If software is up to date 
  3. Replace the K212 Gear Shift Control Module.
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