0549 code when trying to reflash

[skneeland]

Did you try disabling the "SKIM Key Stored in ECM" diag using EFILive?

If you have and also tried disabling all of the other SKIM parameters in EFILive, then you most certainly have an issue with the Key FOB or the truck side sSKIM equipment. Reason I say this is because when doing a 04+ Cummins swap, there are few LD truck O/S's or tunes that will actually allow EFILive to disable the SKIM and let it run past 3 seconds after starting. I recommend downloading a C&C tune from tunefiledepot.com and flashing it to your ECU for testing purposes. I bet that it runs. If so, it pretty much tells me that you have SKIM equipment issues. If not that, your ECU could be suspect.

I have set E6510, F2102, and F2145 all to "Disabled" and it still does the 3 second run time and dies. Am i missing any other "switches"?

or should i return E6510 (VATS) back to enabled and set F2102 & F2145 to disabled? ive been reading that shutting off the VATS on a factory setup can cause problems?
the crappy thing is that once its in this state it wont let me communicate with the ecm, so i cant just keep trying things and reflashing. i have to unhook the batteries and wait an hour , then hope that when i reconnect them that im able to communicate