That code is thrown when the fuel pressure relief valve is popped. When rail pressure exceeds what the relief valve is set for, the valve opens to relieve excess pressure from the rail. Sometimes the relief valve spring gets weak and will open sooner and the more it opens, the weaker it will get. You can either get a shim kit for it or get a rail plug. I just shimmed mine this weekend and solved that issue.
Check out Rollin Smoke Diesel for either of these. James will hook you up
'08 3500 Mega SRW, Laramie, Auto, 6" lift, 37" Toyo OC MT's on 20" Moto Metal 961's .
Minimaxx, Deleted, B&G tuned TCM
'12 3500 CC LB DRW
Laramie, Max tow. It's the wife's