My ABS light and TCS light are always on and engaged

@dragonofaz , Matthew, Check all fuses and relays. Could be faulty wheel bearing/bad/loose wires/plug to ABS sensor or could be faulty ABS sensor, ABS pump motor faulty, EBCM faulty, etc. To help diagnose the issue better, have the vehicle scanned for error/diagnostic codes which may pin point the issue. Some of the auto parts suppliers offer free code reading like Pepboys, Nappa, Advanced auto parts,etc and some of the guys are very knowledgeable and may have seen the issue often and put you on the right track. See technical service bulletins (TSB) link below and links to a couple forums that discuss your problem.

Good luck. I hope this helped you out, if so let me know by pressing the helpful button.

http://www.ehow.com/list_7635921_problem...

http://www.tahoeyukonforum.com/threads/a...

http://www.tahoeyukonforum.com/threads/h...