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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Tow/Haul Switch/Indicator Malfunction >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. 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. 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 
  4. Operate the component: S18 Exhaust Brake Switch - On and Off

    Verify the indicator status: Tow/Haul Mode = On and Off

    • If not the specified state 

      Refer to: Circuit/System Testing

    • Go to next step: If the specified state 
  5. All OK.
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