I have a 2005 Dodge Ram 2500 CTD. When doing the on/off 3 time key check on codes I get the code P0483. There is no check engine light on and all temps are either in the green or below (which has always been since I bought the vehicle.) so all things are normal. Reading a few posts here it seems this pops up one in a while and people are told to clear it and see if it comes back. So I went out and bought a code reader. Followed the instructions and it comes up with "No Codes." I did the on/off key test again and it still shows the code. What can I do to clear it, since the code reader (actron) didn't find any codes???? Thanks in advance for anything advice you can give me.