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Circuit/System Verification

WARNING: This page is about a different car, the 2011 Chevrolet Volt. However, it is still accessible from the selected car via links, so may be relevant.
  1. Service Mode active, observe the DTC information with a scan tool. DTC P00B3, P00B4, P00B6, P0117, P0118, P0480, P0481, P0597, P0598, and P0599 should not be set.
  2. Verify the coolant in the radiator surge tank is at the correct level and there are no engine coolant leaks. Refer to Cooling System Draining and Filling  and Loss of Coolant .
  3. Verify the engine cooling fan operates. Refer to Cooling Fan Malfunction - DTC P148A-P148C .
  4. Engine idling for 15 minutes with the A/C OFF.
    5. NOTE: Depending on ambient temperature, it may take up to 4 minutes for the temperature to decrease less than the specified value.
  5. Command the Engine Coolant Thermostat Heater to 100 percent with a scan tool. Increase the engine speed to wide open throttle.Observe the scan tool ECT sensor parameter. The temperature should decrease to less than 85°C (185°F).
  6. 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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