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Home >> Toyota >> 2009 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 18 (Engine Control System (1AR-FE) - DTC P0125 - P0500) >> 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 variant/trim than selected.

HINT:

This DTC relates to the thermostat.

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 DETECTION CONDITION CHART

DTC No. DTC Detection Condition Trouble Area
P0128 All of the following conditions are met for 5 seconds (2 trip detection logic):
  1. Cold start.
  2. The engine is warmed up.
  3. The engine coolant temperature is below 75°C (167°F).
  • Thermostat
  • Cooling system
  • Engine coolant temperature sensor
  • ECM