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

NOTE: Trouble shoot DTC P0117 or P0118, if set, before proceeding.
NOTE: As engine coolant temperature increases, ECT sensor resistance decreases.
  1. 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 thermostat and cooling system. Repair as necessary.
  2. Check thermostat and cooling system. Repair as necessary. If cooling system is okay, replace ECT sensor.
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