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Home >> Buick >> 2013 >> Encore Base, AWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P2181 >> Circuit/System Verification

Circuit/System Verification

  1. Engine running, observe the DTC information with a scan tool. DTC P00B3, P00B4, P00B6, P0117, or P0118 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. NOTE:

    Depending on ambient temperature, it may take up to 4 min for the temperature to increase greater than the specified value.

  3. Engine idling for 15 min with the A/C OFF. Verify the engine cooling fan is not ON at all times.
  4. Command the Engine Coolant Thermostat Heater to 0 % with a scan tool. Increase the engine speed to 3, 000 RPM. 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.
  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.
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