Josalynn

Yes the left turn signal it just kind of does what it wants when it feels like it and we have searched for the e brake button and cannot find it and when I looked in the manual it said it was an automatic emergency brake system

So our signal light in the 2020 GMC Sierra goes on and off by itself even without the keys in the truck. Also was curious if there's a way manually control the emergency brake.

The right signal light in our 2020 GMC sierra company truck is turning on and off by itself and noticed well getting gas that it turned on and back off again when there was no one inside the truck and the keys were also outside of the truck