I just put on aftermarket rims and tires,with new tpms sensors.I cannot get my tahoe to go into relearn mode...Need help !!@

 

what did you try?

 

I tried holding down lock and unlock buttons ..no horn beep..just locks synching. Tried turning key on and cycling headlights per.owners manual..still nothing

 

Theres nothing in my dic that says re learn mode..just tire pressure..than lf..rf..lr..rr
with - - - -

 

OK I just noticed that you have two topics going for your problem. Please only post ONCE. Not only is it forum rules, it's annoying that people have to open both your topics to read the history of your problem.

Here is the first web search results I found for your vehicle. Make sure that you are setting the parking brake. If that doesn't work, then I guess you have to take it to a shop.