Hi there.
I have a 2013 GMC Sierra 1500 SLT
It has 165,000 km. Today I while I was out I came to a stop sign, and my traction control lights came on out of no where. I was puzzled. I came to a red light and shut off my truck to see if it would turn off and that wasn't the case. I proceeded home with no issues and I tried the button to see if maybe if some how that was the problem but I guess not. I get home and checking through my manual, it says try resetting the system by turning off the truck for 15 seconds. I did so but now my traction control light stays on but the other light for stabilitrak stays off. I went through the button check again, and it says it's on at my display, but the light is still on and my DIC still says service both systems. I don't have any reduced engine power nor a abs light or check engine light. I tried looking for people with similar issues but I don't have a reduced power problem. I have a levelling kit on it with 285/r20 on them and recently installed an air horn on it. Had to mess with some wiring but for the past month had no problems so I know that's not the issue, I didn't touch no wiring except my stock horn. Don't want to bring it to the dealer. Very mechanical inclined so I'm able to do myself. Any help is very appreciated