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Home >> Cadillac >> 2021 >> XT5 Sport >> Repair and Diagnosis >> External Pages >> Different car >> Section 707 (Automatic Transmission - 10L1000 (MGM MGU) - Diagnostic Information And Procedures (2 Of 2)) >> Diagnostic Information and Procedures >> Tow/Haul Switch/Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2023 GMC Sierra 3500 HD and 2023 GMC Sierra 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition - On/Vehicle - In Service Mode
  2. Verify there are no related DTCs set in the following system:Serial Data
    • Go to next step: If a related DTC is not set 
  3. Operate the component:Tow/Haul@S171R Instrument Panel Center Accessory Function Switch - Right - On and Off

    Verify the scan tool parameter:Tow/Haul Mode@K71 Transmission Control Module = Active & Inactive

    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  4. Perform the scan tool control function:All Indicators@P16 Instrument Cluster

    Verify the indicator status:Tow/Haul Mode = On

    • If the indicator is Off 

      Replace the component:P16 Instrument Cluster

    • Go to next step: If the indicator is On 
  5. All OK.
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