Looks like you may have corrected it. Be on the lookout for the coolant level to go down. If you have to add anymore, pull the truck up on a slight incline, and add the coolant slowly while the engine is running and the heater on max. This will burp the air bubble if there is one. Will cause the gage to register accurately too. I have had good luck running mine slightly above to Full coolant line.Just wanted to follow up on my post. I have not encountered the symptoms since I cleared the code. I also seem to be operating at normal temps, I would guess the line is at the 195-200 degree mark.
And to clarify my topping off of the coolant comment, i probably put in about 8-10 oz, it was sitting about 1/2-3/4" below the line. Not sure if that helps determine the cause or not.