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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 121 (Engine Controls And Fuel - 1.5L (LFV) - DTC P0010-DTC P0366) >> Diagnostic Information and Procedures >> DTC P0128 or P01F0 >> Circuit/System Verification

Circuit/System Verification

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  1. Verify the condition does not exist:Incorrect fluid level or condition - Refer to:Loss of Coolant , & Cooling System Draining and Filling (GE-47716) , or Cooling System Draining and Filling (Static)
    • 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
    • { If equipped } B203 Radiator Coolant Temperature Sensor
    • { If equipped } Q74 Engine Coolant Bypass Valve
    • 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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