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Home >> Chevrolet >> 2012 >> Cruze Eco, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 5 (Engine Controls/Fuel - 1.8L - DTC Diagnostics, Troubleshooting & Diagnosis) >> Diagnostic Information and Procedures >> DTC P0128 >> Circuit/System Verification

Circuit/System Verification

WARNING: This page is about a different variant/trim than selected.
  1. Verify the cooling system is filled to the correct coolant level. Refer to Cooling System Leak Testing , and Cooling System Draining and Filling (GE-47716 Fill) , Cooling System Draining and Filling (Static Fill) .
    • 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 to verify the DTC does not reset. 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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