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Home >> Hyundai >> 2018 >> Kona Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 146 (Engine Control System Diagnosis - 1.6L (1 Of 3)) >> DTC P0128-00: Coolant Thermostat (Coolant Temp. Below Thermostat Regulating Temp.) >> DTC Information And Inspection >> DTC Detecting Condition

DTC Information And Inspection: DTC Detecting Condition

WARNING: This page is about a different car, the 2021 Hyundai Kona. However, it is still accessible from the selected car via links, so may be relevant.
TroubleShooting Condition Possible Cause
Main Action
  • Thermostat open stuck monitor
  1. Thermostat stuck
Prerequisite Condition
  • IAT temp is between -7.0°C (19.4°F) and 57°C (134.6°F)
  • ECT at start is between -7.0°C (19.4°F) and 63°C (145.4°F)
  • Difference between IAT at start and IAT is higher then 5°C (41°F)
  • Vehicle speed is less than 25 mph
  • When model ECT is higher than 82°C (179.6°F)
Threshold Value
  • Actual ECT is lower then 76°C (168°F)
Diagnostic Time
  • 3~15 min
MIL
  • 2 Drive Cycle
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