Coolant Temperature Sensor Location

Hello here are two locations for you please check the diagrams below.

My info showed the above picture. For the 4.7L see the diagram below. Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

When idling, after driving and being warmed up, engine begins to rev up a few RPM's not alot but probably like 200 or so from idling RPM's. Then my coolant light will go down as if it is cold and the check engine light illuminates. After scanning my truck it reads code that coolant temp sensor too high of voltage. What does this mean and how should I go about fixing it?

Most likely the sensor is either unplugged or needs replacing. Here's a pic of the location.

Thank you. I will check today