DTC P0128: Thermostat [11/2016 - ]: 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
P0128	Thermostat	All of the following conditions are met for 5 seconds or more (2 trip detection logic): Cold start The engine is warmed up The engine coolant temperature is less than 75°C (167°F)	Water inlet with thermostat sub-assembly (thermostat) Engine cooling system Engine coolant temperature sensor ECM	Comes on	DTC stored