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Home >> Genesis >> 2019 >> G70 3.3T Dynamic, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 32 (Engine Control System Diagnosis - 2.0L (1 Of 4)) >> DTC P0128-00: Thermostat (Temp. Below Thermostat Regulating Temp.) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

WARNING: This page is about a different variant/trim than selected.
Item Detecting Condition Possible Cause
Main Action
  • Measure engine coolant temperature
  1. Thermostat open stuck
  2. Poor connection or harness damage
Prerequisite condition
  • The portion of fuel cut-off phase and low load phase is lower than 20% and 50% respectively.
  • The percentage of high vehicle speed phase over 140Kph (87 Mph) is lower than 90%.
  • No engine speed higher than 4800 rpm with vehicle stopped.
  • Intake air temperature (IAT) compared to starting IAT is dropped by over-20°C (68°F).
  • Battery voltage is between 11V and 16V.
  • Engine coolant temperature at the time of starting is lower than 54.8°C (130.6°F).
  • Ambient air temperature is higher than -10°C (50°F).
Threshold Value
  • Measured engine coolant temperature (ECT) is lower than 74°C (165.2°F). (When modeled ECT is higher than 85°C (185°F).
Diagnostic Time
  • 10 to 30 Minutes
Mil On Condition
  • 3rd Driving Cycle
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