Last year I did some research with SDR (Software Defined Radios) I was able to start a 2015 Dodge Durango a quarter mile from its key.
The setup that I used cost about 4500$ dollars it is basicly one radio listening for 433/315MHZ messages from the keyfob and replaying the data untouched on the other end.
This attack worked on all vehicles that use key fobs under 700MHZ so pretty much all PKES passive key entry systems Push Button Start Cars ^Except Ford and BMW^ cause it uses above 700MHZ
It tricks the cars into thinking the key is at the second radio. The device I built last year they have made a smaller version of now and the entry point for the thief's is 11 Dollars !!!
https://www.wired.com/2017/04/just-pair-11-radio-gadgets-can-steal-car/
I will be Demoing a way to stop this attack at Defcon25 a hacker convention in Las Vegas I built an 11 dollar device that blocks the bad guys radio from talking until your cell phone is in range.
Cell phones use Bluetooth which is 2.4 GHZ and will not be affected by my 315/433 jammer.
The jammers power only covers about a 1 FT radius so it does not stop other cars from being started just the intended owner.
Let me know if you have any questions and please subscribe/follow for more information.