The short definition of the engine P0116 Code is Engine Coolant Temperature (ECT) sensor circuit range recital problem. The cause of the engine code is When a cold engine is happening and take to up the ECT sensor worth does not change. Another possible cause of the engine problem is the warmed up engine ECT sensor worth does not modify when the engine is turned off auto and the next cold engine start achieved. Based on some symptoms, it is possible to identify the reason of the car engine problem. Proper verification is necessary for fixing the car engine problem and solution.