DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): Description

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This DTC is set when the engine coolant temperature does not reach 75°C (167°F) despite sufficient engine warm-up time having elapsed.

DTC No.	DTC Detection Condition	Trouble Area
P0128	Conditions (a), (b) and (c) are met for 5 seconds (2 trip detection logic): (a) Cold start (b) Engine warmed up (c) Engine coolant temperature less than 75°C (167°F)	Thermostat Cooling system Engine coolant temperature sensor ECM