What are some of the 2015 VW Passat push button start problems?

The push button start feature on the 2015 Volkswagen Passat is a great introduction and a cutting edge feature to have, but any time You introduce new technology, there exists the potential for more things to break or otherwise go wrong. In Your case, the big issues You'll be looking at are a dead key battery, a dead car battery, or a failed push button start switch. A bad key fob battery is preferable here, since You'll only be looking at a few dollars and a few minutes to replace. A car battery is pretty self explanatory, but the switch isn't too bad either. The replacement will set You back about $120, and You can typically complete the swap in an afternoon.