Why won't my jeep start after shutting off driving and now shows key w

So it shut of while driving? The key with the slash indicates an issue with the immobilizer system. Try disconnecting the battery cable and after a minute or two reconnecting it. If this doesn't do it you may need a dealer (or someone with a code reader that can read those codes. Indications seem to be that normal obd2 readers won't read them all, but you can try!!)