having trouble with my 05 Chevy 3500 4x4, 60,000 mile on it, 6.6 with the PO090 code and no start. dealer fixed frayed wire that went from the FICM to Regulator and the problem seemed to go away. 1 month later the same problem with the same code, dealer could find nothing wrong the placed a call to TAC, they recommended that restring new wire from FICM to Regulator which they did and it seemed fine no more code. let it set for 2 days and went to go Christmas shopping this morning and a no start problem again, had neighbor come over with code scanner and low and be hold the Code PO090 shows up again, this has cost me almost $800 so far and I need an answer can anyone help?? thanks