05 xb, 123k. Check engine, vsc, and trac off come on. Every time I have plugged into it to find out what the code is, it tells me no codes are present and the lights go out for a couple of days. I don't even reset the ecu. Help!

 

Correct. Those lights do not all come on all at once and have a problem with all three all at once. This is a wiring glitch or a short somewhere causing the lights to come on. It's not an actual problem with the systems themselves that's causing the lights.