I have a 2005 roadster convertible with 79k miles on it that I just bought. I had to have it towed because it would not start and the transmission shifter wouldn't
come out of park ( locked up ? ). It has a pretty new battery that was dead, I took the battery to an auto zone and they charged it and checked it and found it to be OK. I reinstalled it and nothing !!! All the lights and radio come on but it still won't start and the transmission won't come out of park. I researched it and from what I can come up with is possible a bad security app. Anybody have this problem and what did you do to fix it? Any help would be very appreciated !!!!!

 

Id bet money you have the "Mystery No Start" which we've known about for over ten years, it is talked about here:
https://www.crossfireforum.org/forum...-no-start.html

I think you need a new RCM, but to be sure, do this:
Get in car, turn key to START. If dash comes alive but starter does not engage, release key to ON and wait 45 seconds.
If engine fan warps up to HIGH speed (it will be LOUD), your RCM is bad. Order a new one and have your bad one shipped to DJ for rebuild so you have a spare.
Many of us now carry spares.

If engine fan does not speed up in 45 seconds, post that information and we can look at other ideas. My first one is the battery is bad. The AUtozone test is almost meaningless.
Low terminal voltage when the key is 'ON" will prevent starter engagement. The battery can pass a capacity test and still have low terminal voltage. We've seen this many times.