This posting really helped me out tonight. I have a 2014 Suburban and had the abs and traction control light come on after replacing the rear shocks. Sure enough after reading this article I found that the wheel speed sensor had become unplugged on the passenger side rear. It is located directly on top of the frame rail right where you struggle to get a socket into to remove the upper shock bolt. I plugged it back in and the lights went out as soon as I started it again.