Don't know if this will help, but I had problems with my 01' when towing. The SES light would come on, the truck would power down hard and go into limp mode (2k rpm max and no power). Code set was an over boost code. Tracked problem to the intake I was running, not so much a specific mfg, just a less restrictive intake. As kennedy said there a phantom problems with the 01' programming. My dealer reflashed or upgraded to the latest program and all seems to be fixed. I never did have any fuel system codes though so I am not sure if this is the same problem. Hope this maybe helps. Shed
01' LB7 2500 HD ext.cab, auto, 4" magnaflow, airaid intake, Mag-Hytec tranny pan, all Amsoil, Bilsteins.
In pusuit of the perfect camper pulling rig....
05'-30' Pilgrim 5th wheel
Always on the road headin for a campsite!