DTC P0116: Engine Coolant Temperature (ECT) Sensor 1 Circuit Range/Performance Failure

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P0116 - ENGINE COOLANT TEMPERATURE (ECT) SENSOR 1 CIRCUIT RANGE/PERFORMANCE FAILURE

Description:	Indicates the engine coolant temperature rationality test has failed. The powertrain control module (PCM) logic that sets this DTC indicates that ECT or cylinder head temperature (CHT) drifted higher than the nominal sensor calibration curve and could prevent 1 or more on-board diagnostic (OBD) monitors from executing. The PCM runs this logic after an engine off and a calibrated soak period (typically 6 hours). This soak period allows the intake air temperature (IAT) and engine coolant temperature (CHT or ECT) to stabilize and not differ by more than a calibrated value. DTC P0116 is set when all of the following conditions are met: The engine coolant temperature at engine start exceeds the IAT at engine start by more than a calibrated value, typically 17°C (30°F). The engine coolant temperature exceeds a calibrated value, typically 107°C (225 °F). The fuel system, heated oxygen and misfire monitors have not completed. The calibrated timer to set DTC P0116 has expired.
Possible Causes:	Engine coolant temperature (ECT) or cylinder head temperature (CHT) sensor Coolant system concern
Diagnostic Aids:	Make sure the IAT and the engine coolant temperature are similar when the engine is cold. Also make sure the ECT or CHT sensor and the actual engine operating temperatures are the same.
Application	Key On Engine Off	Key On Engine Running	Continuous Memory
Vehicles with only a cylinder head temperature (CHT) sensor	-	-	GO to DL: Cylinder Head Temperature (CHT) Sensor STEP DL23.
Vehicles with only an engine coolant temperature (ECT) sensor	-	-	GO to DX: Engine Coolant Temperature (ECT) Sensor STEP DX13.
Vehicles with both a CHT and an ECT sensor	-	-	GO to DX: Engine Coolant Temperature (ECT) Sensor STEP DX13.