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Home >> Chevrolet >> 2024 >> Tahoe Commercial, 4WD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Transfer Case - Mp 3025 (NQH) - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC P188B >> Circuit/System Verification

Circuit/System Verification

  1. Ignition/Vehicle in Service Mode.
  2. Verify there are no DTCs set related to the following component/system:Serial Data
    • Go to next step: If a related DTC is not set 
  3. Clear the DTCs.
  4. Operate the vehicle within the Conditions for Running the DTC.

    Verify the DTC does not set.

    • If the DTC sets 
    1. Ignition/Vehicle - Off
    2. Replace the component:The control module or component that is sending the error message to the control module K69.
    3. Operate the vehicle within the Conditions for Running the DTC.

      Verify the DTC does not set.

      • If the DTC sets

        Replace the component: K69 Transfer Case Control Module

      • Go to next step: If the DTC does not set
    4. All OK.
    • Go to next step: If the DTC does not set 
  5. All OK.
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