Need help with DD15 diagnosis!!

I have a 2013 Freightliner Cascadia with a DD15 EPA07. I noticed it was running a little warmer than usual. Fan used to kick on at about 220 and bring it back down to normal. Well lately fan wont kick until at least 230 if not more but still it back down to normal. Showed 1 fault code, took it to Freightliner and they couldnt find anything wrong with it. Said it might be the gauge or a sensor. Few days later check engine light comes while starting, but then shut off and no code ever shown. After that run light comes back on and hasnt shut off since. The temp hasnt gone over 145-150 in idle (which is not normal) and dont warm up until actually start driving. Took it to Loves just because i didnt want to pay the dealer AGAIN. They ran a quick diagnostics attached is the print out they gave me. Now its giving me code EnC1 1451 647 Fail SPN 5. The dealer says Loves diagnostics cannot be trusted but I think they just trying to get more money out of me. Does anyone have any clue as to whats going on with my truck or why shes flashing these codes and acting a bit funny. Any help is much appreciated. (The Loves attachment is 2 pages long.)

 

that is my guess as well. But now a days,so much extra BS added to theses engines . im not sure were the problem is and is it something i can Do myself or do i HAVE to take it to those theiving Freightliner shops.

yea it kicks on,

 

i did notice some of the wires have the covers detereorating a bit , i went ahead and covered them up again. while i was at it, also took time to check plug-ins and watched for any bare wires. nothing unusal