DTC P0116: Engine Coolant Temperature (ECT) Sensor Range/Performance Problem

NOTE: If DTCs P0117 and/or P0118 are also set, trouble shoot those DTCs before DTC P0116.

Start engine and run at 3000 RPM with no loads and transmission in Park or Neutral, until radiator cooling fan comes on. Allow engine to idle. Using scan tool, check ECT data. If indicated temperature is 176-194°F (80-90°C), problem is intermittent, system is okay at this time. Check cooling system. If indicated temperature is not 176-194°F (80-90°C), check cooling system. If cooling system is okay, replace ECT sensor.