Well, I'm to this place for help as last resort . Tci/ fast support stinks .. this will be last product I ever buy from them . Was gonna add fast efi this summer I'll be going to another brand now . Anyway 3 weeks of unanswered emails to tci tech . Complete rerouting of harnesses 3 times now , hooking up all power sources direct to battery , still getting commloss error while coasting , if I'm on throttle I never get comm loss , about to tear this whole setup out of the truck . Ohh I have no error codes at all . 3 yrs of building this truck and $30k in parts now still can't drive it . Pretty fed up with low quality parts !!