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Hello and welcome to just answer. i am a shop foreman at a Jeep dealer and see this issue on these Jeeps. If you are certain there are no codes, then you have a failing PCM . Do you have a scan tool that will read OBD 2 I/M readiness monitors?
I asked that question because a quick way to confirm if a PCM shut down is to look at the OBD readiness monitors after the Jeep will restart. If the monitors reset to a "not ready" or incomplete" status, then that is proof that the PCM shut down when it got hot. If so, replace the PCM.
Sounds like it is the PCM. Thge only other test would be to have the scan tool connected when it acts up and see if the scan tool looses communication with the PCM. That would confirm it.
By the way, you are very welcome my friend!
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Well from what I see at the dealer I work at, I am pretty confident that this is the problem. Keep me posted.