I HAVE CODE P0502 AND P0742 WHAT DO YOU RECCOMMEND CHEVROLET

Question

what do you recommend I do first

Answer 1

P0502 Vehicle speed sensor low input

P0742 Torque convertor clutch circuit stuck on.

This depends if the engine is stalling , P0742 would be the result for P0502 when you have a low speed and a high  engine speed (RPM) , When the TCC sticks you can resolve this most time with a transmission fluid change.