DTC P0116: ECT Circuit Problem: Condition

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After vehicle has been cold soaked (turned off) for 6 hours, PCM monitors ECT sensor maximum and minimum value when engine is started and 5 minutes after starting engine. If ECT sensor maximum and minimum values vary less than 10°F, DTC is set. Causes may include the following:

Faulty ECT sensor.
Faulty connector.
PCM malfunction.