guywino

I have a 2021 sierra 2500hd SLE, and usually shut down with the infotainment off. Sometimes when I start the radio is on at the last station medium volume. I have tried everything, mute, zero volume, totally off etc, and no change. If it is only off a short time, few minutes to hours, it will start the same as shutdown. But if off longer. like overnight, starts with radio on. I believe is is caused by a system RAM problem. My guess is that station presets are non volatile, but other data is volatile, and if it is lost, corrupted, or the computer thinks it is, it goes to the default software which is probably radio last station at medium volume. Pulling the infotainment fuses causes it to happen every time, which supports the RAM loss theory. I asked the dealer and they know nothing, so I am going to keep track of shutdown condition, time off, and start condition for a while, and then tell them to fix it, even if they have to replace the system.