DTC P0128: Thermostat [09/2014 - 11/2017]: Description
WARNING: This page is about a different car, the 2017 Lexus RC 350, 2017 Lexus RC 300, 2016 Lexus RC 350, 2016 Lexus RC 300, and 2015 Lexus RC 350. However, it is still accessible from the selected car via links, so may be relevant.
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 |
|---|---|---|---|---|---|
| P0128 | Thermostat | All of the following conditions are met for 5 seconds (2 trip detection logic): (a) Cold start (b) The engine is warmed up (c) The engine coolant temperature is less than 75°C (167°F) |
|
Comes on | DTC stored |