LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 92 (Engine Controls And Fuel - 2.8L (LWN) Diesel - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC P0128 or P01F0 >> 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 there are no DTCs set related to the following system/component:
    • {P0117, P0118, P0119}B34 Engine Coolant Temperature Sensor
    • B75C Multifunction Intake Air Sensor
    • Go to next step: If a related DTC is not set 
  2. 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 
  3. Engine - Running @ 3000 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.
scientia non olet · About LEMON Manuals