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DTC P0128 Thermostat Malfunction: Description

WARNING: This page is about a different car, the 2007 Toyota Land Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

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

DTC TROUBLE DETECTION CONDITION

DTC No. DTC Detection Condition Trouble Area
P0128  Conditions (a), (b) and (c) are met:
  1. Cold start
  2. After sufficient warm-up time has elapsed
  3. ECT is less than 75°C (167°F)
  • Thermostat
  • Cooling system
  • Engine Coolant Temperature (ECT) sensor
  • ECM
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