HI
I have autel maxisys 908 .I'm unable to diagnose Tahoe ltz 2015 and other GMC Yukon models in general. When I just plug the cable into the obd2 port the traction control light illuminates and disables, cruise control disables, and other features disabled.  I can read the VIN and read codes but the codes aren't true because when I unplug the cable everything goes back to working properly.