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Home >> Genesis >> 2021 >> G90 5.0 Ultimate, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Control System Diagnosis - 3.3L (2 Of 9)) >> DTC P0128-00: Coolant Thermostat (Coolant Temperature below Thermostat Regulating Temperature) >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

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Item Detecting Condition Possible cause
DTC Strategy
  • Coolant temperature is not reached warm up state
  1. Thermostat open stuck
  2. Poor connection or damaged harness
Enable Conditions
  • Fuel-cut off phase is less than 20%
  • Low load phase is less than 50%
  • High vehicle speed phase is less than 90.2%. (vehicle speed is greater than 87 mph)
  • Engine speed is less than 4800 RPM
  • ECT change is greater than -2.25°C (27.95°F) during 15 seconds
  • Intake air temperature is 20.3°C (68.54°F) greater than IAT at engine start
  • Battery voltage is between 11V and 16V
  • Engine Coolant Temperature at start between -9.8°C (14°F) and 54.8°C (131°F)
  • Intake air temperature at engine start is greater than -9.8°C (14°F)
  • Ambient Air Temperature (AAT) is greater than -9.8°C (14°F)
Threshold Value
  • Measured coolant temperature is less than 69~79°C (156.2~174.2°F) when modeled coolant temperature is greater than 80~90°C (176~194°F)
Diagnosis Time
  • 10~30 min. depending on coolant temperature at start and driving pattern
MIL On Condition
  • 2 driving cycles