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Home >> Lexus >> 2010 >> GS 350 AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 158 (Engine Control (SFI) (2GR-FSE) System (DTCS P0010 - P0354)) >> SFI System >> DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) >> Description

DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): Description

WARNING: This page is about a different car, the 2009 Lexus IS 350. However, it is still accessible from the selected car via links, so may be relevant.

This DTC is set when the Engine Coolant Temperature (ECT) does not reach 75°C (167°F) despite sufficient engine warm-up time.

DTC No. DTC Detection Condition Trouble Area
P0128
  • Conditions (a), (b) and (c) are met for 5 seconds (2 trip detection logic):
  • (a) Cold start
  • (b) Engine warmed up
  • (c) ECT less than 75°C (167°F)
  • Thermostat
  • Cooling system
  • ECT sensor
  • ECM
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