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Home >> Toyota >> 2017 >> Highlander Limited, FWD >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> SFI System [2GR-FKS] - Diagnostic Codes - (Except Hybrid) (1 Of 4) >> SFI System >> DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [11/2016 - ] >> Description

DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [11/2016 - ]: Description

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).
  • Water inlet with thermostat sub-assembly
  • Engine cooling system
  • Engine coolant temperature sensor
  • ECM
 Comes on DTC stored SAE Code: P0128
DTC for Mexico Models:
- Does not apply
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