DTC P0116: ECT Sensor Range/Performance Problem

NOTE: Trouble shoot DTC P0117 or P0118, if set, before proceeding.

NOTE: As engine coolant temperature increases, ECT sensor resistance decreases.

If DTC P0116 is present, check for ECT sensor deterioration or cooling system malfunction. Repair as necessary. If no problems are found, go to next step.
Start engine and run at 3000 RPM, with no load and transmission in Park or Neutral, until radiator fan comes on. Allow engine to idle. Using scan tool, check ECT sensor data. If indicated temperature is not 176-200°F (80-93°C), go to next step. If indicated temperature is as specified, problem is intermittent. System is okay at this time. Check cooling system. Repair as necessary. If cooling system is okay, replace ECT sensor.