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HOMESERVICE MANUALSHYUNDAI2013GENESIS COUPE 2.0T PREMIUMREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROL SYSTEM (DTC TROUBLESHOOTING) (1 OF 3) - 2.0LDTC P0128: COOLANT THERMOSTAT (COOLANT TEMPERATURE BELOW THERMOSTAT REGULATING TEMPERATURE)SYSTEM INSPECTION
2013 Hyundai Genesis Coupe 2.0T Premium

System Inspection

2013 Hyundai Genesis Coupe 2.0T PremiumSECTION System Inspection
  1. Coolant Level Inspection
    1. Check the cooling system coolant level.
    2. Is the coolant in the reservoir at the proper level?

      YES 

      • Go to next step.

      NO 

  2. Thermostat Inspection
    1. Check if the thermostat bypass valve is stuck in the open position or if the correct type of thermostat was installed. Replace thermostat as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure
    2. Check the valve opening temperature of the thermostat

      Specification (Valve opening temperature):  80~84°C (176~183°F)

    3. If the opening temperature is not as specified, Replace thermostat as necessary and go to "VERIFICATION OF VEHICLE REPAIR " procedure.

      If OK, Go to next step.

  3. ECT Sensor Inspection
    1. Ignition "OFF"
    2. Disconnect ECTS connector
    3. Measure resistance between terminals 1 and 3 of the sensor connector (Component side)

      Specification: 

      TEMPERATURE AND RESISTANCE CHART

      Temp. (°C) Resistance (kΩ)
      -20 14.1 ~ 16.8
      0 Approx. 5.8
      20 2.3 ~ 2.6
      40 Approx. 1.2
      60 Approx. 0.6
      80 Approx. 0.3
    4. Is resistance within the specification?

      YES 

      • Go to the next Inspection procedure.

      NO 

      • Check ECTS for contamination, deterioration, or damage. Substitute with a known-good ECTS and check for proper operation. If the problem is corrected, replace ECTS and then go to "VERIFICATION OF VEHICLE REPAIR " procedure
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.