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Home >> Lexus >> 2024 >> RC 350 Base, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 24 (Engine Control System (8AR-FTS) - Diagnostic Codes (02 Of 10)) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [08/2016 - 09/2020] >> Description

DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [08/2016 - 09/2020]: Description

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This DTC is stored when the engine coolant temperature does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P0128-00 Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) All of the following conditions are met for 5 seconds or more (2 trip detection logic):
  1. Cold start.
  2. The engine is warmed up.
  3. The engine coolant temperature is less than 75°C (167°F).
  • Thermostat
  • Engine cooling system
  • Engine coolant temperature sensor
  • ECM
 Comes on DTC stored SAE Code: P0128
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