I've owned my truck for 8 months now. Had some problems with 70 m.p.h. vibe but it's fixed now. It took 5 trips to the dealer and a lemon law threat. A bent drive shaft was the problem. It was .350 of and inch out in two places. Now it drives smooth as glass. Question on codes. When I checked them today this is what it said.
C-CODE
66 72
A4 13
00 00
CAN ANYBOUDY HELP WITH THESE?
THANKS....
WHAT A GREAT PLACE TO HANG OUT! (DIESEL TRUCK RESOURCE)
IT'S SO MUCH FUN I HAD TO BECOME A MEMBER....

 

those are not engine codes. You may want to check the "no drive train forum".

If you cycle the key 3 times, the odo will display P#### codes (called P-codes). Those are engine / powertrain fault codes.

Glad you got your truck fixed without hitting someone on the head with your driveshaft at the dealer.