P0116 - Engine Coolant Temperature Sensor 1 Circuit Range/Performance
Engine Coolant Temperature is monitored to allow the ECM to accurately adjust fueling and emission control systems, it will also normally be used to control cooling fan operation
Fault Code Explained
The sensor output signal is likely to be within it’s normal operating parameters but is not as expected for the current operating conditions. The ECM may have detected the sensor output is incorrect when compared with other sensor values.
If possible use a diagnostic computer to view live data readings for the sensor and compare to actual coolant temperature. Test sensor supply Voltage and output signal