2009 silverado traction control and stabilitrak light keep coming on.

My guess is a bad wheel speed sensor or bad connection. The brake pedal vibrating is probably just the ABS working.

Guys have you checked your mass air flow sensor? Thats what it was for me been good ever since.

Did you ever find the answer? My 2016 GMC 2500 does the same thing! the light goes on and off going in a straight line, turning, on hills, on flat roads or just sitting still. Its becoming super annoying and affecting my braking. When I brake the truck yanks to the left.

I have a 2011 gmc sierra was doing exacly the same went to 3 mechanics and no one fixed i did some research,and I change the breaks switch and I fix the prblem now it starts on my 2014 Silverado ill do the same I hope it'll works too

This may sound crazy but I had a check engine light for the Mass Air Flow sensor on my 2009 Silverado LTZ 5.3. As soon as the check engine light came on, the service Stabiltrak and traction control disabled warning appeared. I changed the Mass Air Flow sensor and the Stabilitrak and Traction Control warnings went away. Its been fine for a few weeks now.

check engine light? scan for your code and go from there. period! advanced auto scans for FREE. - found PO307 code - means cylinder #7 plug fouled out. changed plug, problem solved. if you get a PO30? code of any kind? 301? cylinder #1, 302? cylinder #2, and #3 and so on and so forth... blah blah blah... just change ALL PLUGS/WIRES to eliminate ANY and ALL cylinder misfires, (your plugs, and wires, definitely need changed anyways if youre over 100K miles on your truck), change your air filter, clean your IAC MAF sensor with cleaner takes 2 minutes, and change your oil, or top-off with the recommended weighted synthetic oil. When your done, to clear all codes?..., pull your negative battery terminal off for an hour (time it), and reinstall later (an hour), and fire up truck, and codes cleared and gone. Done. A little maintenance goes a long way her folks. IF your NOT mechanically inclined do NOT attempt yourself, take to your local mechanic period. thats my experience, strength, and hope that you can solve your issues as well. **** (Changing your air filter with each oil change helps as well!!... go look at its probably in need of changing. I know how people are trying to just get by these days, but your vehicle will FAIL eventually (PO300 Code means FAILURE of internal engine parts) be in the junkyard if you dont do the regular maintenance.) **** Period. Thanks... Dantheman Johnson

"Steering Wheel Position Sensor" - (SWPS) - trouble code for this. mechanic replaced for me it is labor intensive - stabiltrak fixed!!... replace all your underhood fuses too!! no dummy lights!! gone!! use lots of dielectric grease when installing fuses and clean the "box' with electrical cleaner and let dry in sun. thanks - Dantheman