These year models are a major PITFA when it comes to flashing. You already have to pull the radio fuse if there's an aftermarket radio in the truck or it won't complete the flash, but I am constantly having failed boot loader issues on these particular year models and ONLY these year models. Any reason as to why? Any way around it? I'm not talking just a couple. This has been throughout 10 years of tuning and 3 different cables.
I've got one I'm tuning now that's failed bootloader and now I can't even communicate with the PCM at all. Not even through the scanner. I cringe when someone calls asking for a tune for a truck or SUV around this year because they're almost always a pain.
Any help or pointers is appreciated. Thanks.