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Home >> Chevrolet >> 2011 >> Volt >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls And Fuel - 1.4L (LUU) - DTC P0010 Through DTC P0328 >> DTC P0128 >> Circuit/System Verification
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Circuit/System Verification

  1. Ignition OFF, inspect the cooling system surge tank for the proper coolant level. Refer to Loss of Coolant and Cooling System Draining and Filling .
  2. Service Mode active, observe the DTC information with a scan tool. DTC P00B7, P0597, P0598, P0599, or P2181 should not be set.
  3. Ignition ON, engine running for 15 min with the A/C OFF.
    4. NOTE: Depending on ambient temperature, it may take up to 4 min for the temperatures to equalize.
  5. Command the Engine Coolant Thermostat Heater to 0% with a scan tool. Increase the engine speed to wide open throttle. Observe the scan tool ECT Sensor parameter. The temperature should increase to greater than 102°C (215°F).
    • If less than the specified value, replace the E41 Engine Coolant Thermostat Heater.
  6. Command the Engine Coolant Thermostat Heater to 100% with a scan tool. Increase the engine speed to wide open throttle. Observe the scan tool Radiator Coolant Temperature Sensor and the ECT Sensor parameters. The Radiator Coolant Temperature Sensor and the ECT Sensor parameters should be within 20°C (68°F).
  7. Engine idling, observe the DTC information with a scan tool. DTC P0128 should not set.
  8. 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.
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