MrHalfSack

I have a 2008 GSR and I am getting the SES light and I get code U0121, and can bus timeout. When I start the car, everything seems fine, after I drive for about 30 seconds, this pops up. Once it does, I can't change between tarmac, snow and gravel. I get the awd service needed on the hud as well.

I have searched for possible causes for these issues. It I haven't found any concrete answers. Anyone have any ideas?

At this point all I have done is check all the fuses related to abs.

MrHalfSack

Had the battery unhooked to replace the amplifier and once I drove the car again, never had the code again. It's been roughly three weeks since.