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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 102 (Engine Controls And Fuel - 6.0L (L96 LC8) - Diagnostic Information And Procedures (1 Of 2)) >> Diagnostic Information and Procedures >> DTC P0128 >> 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. Verify the condition does not exist: Incorrect fluid level or condition - Refer to: Loss of Coolant
    • If a condition exists 

      Repair or replace as necessary.

    • Go to next step: If no condition exists 
  2. Verify there are no DTCs set related to the following system/component: B34 Engine Coolant Temperature Sensor
    • Go to next step: If a related DTC is not set 
  3. Engine - Running @ 1, 800 to 2, 200 RPM

    Verify the scan tool parameter: ECT Sensor = Greater than 80°C (176°F) - Within 15 min

    • If 80°C (176°F) or colder 

      Test or replace the component: Engine Coolant Thermostat

    • Go to next step: If warmer than 80°C (176°F) 
  4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

    Verify the DTC does not set.

    • If the DTC sets 

      Refer to: Circuit/System Testing

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