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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) >> 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
DTC Strategy
  • Thermostat open stuck monitor
  1. Thermostat stuck
Enable Conditions
  • 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 On Condition
  • 2 Drive Cycle
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