Gone Ropin
New member
- Joined
- Jan 18, 2009
- Messages
- 28
2008 GMC 3500. 4x4 Sierra. Had the truck a month now every time I hook up to the horse trailer the engine light comes on power derates and it goes to 0% fuel filter life. Has new AC fuel filter and replaced both hoses on filter housing hoses by tranny and on top all look good and not linked. not running any tunes stock exhaust for now. It has a air dog 200 with new filters as well but I have it bypassed and still the same problem. It will also go to 0% filter life at 80MPH when passing with the truck empty but it won't derate unless the trailer is on. After a cool down it will clear and go back to running and clear itself. Stealer ships in area are clueless. Local diesel shops want me to leave it with them. I can fix it just gotta learn these junky systems. I'm really hating this truck. Can't wait till I get my 96 dodge 12 valve fixed from being in a wreck. Any help would be greatly appricated. :nail: