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Home >> Chevrolet >> 2014 >> Spark LS, Standard Trans >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.2L - DTC P0010 To DTC P0446 >> Diagnostic Information and Procedures >> DTC P0128 >> Circuit/System Verification

Circuit/System Verification

  1. Verify the cooling system is filled to the correct coolant level. Refer to Cooling System Leak Testing and Cooling System Draining and Filling .
    • If the coolant level is not correct 

      Repair as necessary

    • If the coolant level is correct 
  2. Verify the DTC P00B7, P0116, P0117, P0118, P0597, P0598 or P0599 is not set.
    • If a DTC is not set 
  3. Engine running for 15 min with the A/C OFF, increase the engine speed to 3, 000 RPM.
  4. Verify the scan tool ECT Sensor parameter is greater than 79°C (174°F) when commanding the Engine Coolant Thermostat Heater to 0%.
    • If less than 79°C (174°F) 

      Replace the E41 Engine Coolant Thermostat Heater.

    • If greater than 79°C (174°F) 
  5. 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.
  6. Verify the DTC does not set.
    • If the DTC sets 

      Refer to Step 1.

    • If the DTC does not set 
  7. All OK.
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