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. Let engine idle. Using scan tool, check ECT data. If temperature is 176-194°F (80-90°C), problem is intermittent, system is okay at this time. Check cooling system. If temperature is not 176-194°F (80-90°C), check cooling system. If cooling system is okay, replace ECT sensor.