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Home >> Hyundai >> 2017 >> Sonata Base >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 34 (Engine Control System Diagnosis - 1.6L (1 Of 3) (Except HEV)) >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Component Inspection

Component Inspection

WARNING: This page is about a different variant/trim than selected.
  1. Remove the thermostat and check the following information:
    1. Stuck or damaged
    2. Verify the temperature at which the valve is open
      • Valve opening temperature: 82°C (177°F)
      • Full opening temperature: 95°C (205°F)
  2. Is the thermostat normal?

    YES 

    • Clear DTC and Test-drive under enable conditions above-mentioned. After the test, If this DTC is set, recheck it thoroughly. If not, it is intermittent fault, go to "VERIFICATION OF VEHICLE REPAIR " procedure.

    NO 

    • Substitute with a known - good Thermostat and check for proper operation. If the problem is corrected, Go to "VERIFICATION OF VEHICLE REPAIR " procedure.
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