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Home >> Buick >> 2012 >> Enclave FWD >> Repair and Diagnosis >> Engine Mechanical >> Cooling System (Mechanical) >> Engine Cooling System >> Diagnostic Information and Procedures >> DTC P1258 >> Circuit/System Verification

Circuit/System Verification

NOTE:

If DTC P0480, P0481, P0691, P0692, P0693, or P0694 is set, diagnose that DTC first.

  1. Observe the engine coolant level. The engine coolant level should be within the operating range. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac N Fill) .
  2. Ensure that the vehicle has the correct engine coolant with correct concentration and is not old, contaminated, or contains additives. Refer to Cooling System Draining and Filling (Static Fill) , Cooling System Draining and Filling (Vac N Fill) .
  3. Inspect the cooling system for the following:
    • Leaks
    • Kinked or pinched hoses, especially at the radiator
    • Loose, missing, or damaged radiator air seals or deflectors
    • Air flow obstructions or bent fins at the radiator or the A/C condenser-Refer to Symptoms - Engine Cooling .
    4. NOTE:

    A short delay occurs before the ECM changes the cooling fan speed.

  4. Command the cooling fans ON and OFF, low and high speed. The engine cooling fans should turn ON and OFF with each command.
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