I have a 2011 Suburban LTZ (w/autoride) with 180k miles on it. I was intermittently getting the Service Traction Control and Service Stabilitrak warnings but the truck seems to run fine, no misfire or rough idling or anything like that. So I replaced the brake switch attached to the brake pedal and both front wheel speed sensors and none of those worked. Then I replaced the steering angle sensor and that seemed to take care of the problem for 2-3 months and now a couple of weeks ago it came back while I was sitting in line at a car wash. I turned the vehicle off and did not see any of the warnings for a couple of weeks. Now the other day the Service Traction Control and Service Stabilitrak warnings on the dash and now the ABS light is on as well. The lights are no longer intermittent, they come on when I start the vehicle and stay on. I have a cheap InCarDoc OBD scanner tool and it is showing that there are no codes in the vehicle. Also the weather has not been below freezing for at least a month or 2 and it has been around the 50's and 60's the last few weeks and not much rain either so cold temps and water shouldn't be factors. I replaced my front pads and rotors at the same time as the front wheel speed sensors, so I already had the problem before I did the brakes and the only other performance mod is a S&B intake that I installed 2-3 years ago, so well before the problems arose. Any help would be greatly appreciated as tracking this problem is getting annoying...