Well, not quite the same issue...Sounds like an issue with your speed sensor or the wiring to the TCM, or the TCM itself. Low fluid level can trigger the same issue, however I have to "assume" that it was checked. As to the A/C issue, rodents can cause havoc with wiring issues at the PCM. Good place to start.

Probably not the same issue but the same symptoms and the same recommendations to solve them that never worked. If the problem was wiring, that was already carefully checked, it would not fix itself after stopping, shut off the car and just start it again w/o problems. I read it in multiples blogs about Chrysler 300 transaxale problems and how to solve them quickly after expending time with the dealers w/o solutions. Let me add that it is pretty common to change the PCM (by direct Dealer recommendation) and nothing is solved. Looking around for other blogs, you will find many 300 owners with the same problem... and no solution, at this point. Thanks

The codes I have issued in detail on my reply on 07-06-2014 04:28 PM
P0700
P2767

The car is a 2006 Chrysler 300 Touring 4dr Sedan (3.5L 6cyl 5A)

-Transmission standard at 125000 miles
-Speed sensors changed
-Fails mostly on summer (all the time)
-Drives up to 40 MPH w/o issues and then gas pedal does not respond and
keeps the speed (limp mode) until stop the car, swith off, switch on and it works properly again. No more fails after that (next start will fail for sure)
-Engine light on and off
-When entering to limp mode, jerk gear changes are issued
-Manual option (1-2... ) does not work during limp mode
-When fails, even R does not work, only D at 40 MPH

Apparently, the ECM or TCM could be the cause. I would liek to know if thee is a way to know for sure, before going to the dealer to listen that everything muts be replaced...

Thank you

2767 input speed sensor signal circuit PCM for this?
Have you not at least triad the speed sensor first?

Possible poor connection at speed sensor.
 

I have seen issues with the connector at the speed sensor cause this problem. Yes, shutting off and re-starting is a temp. fix, as the TCM re-sets before sending your speedo crazy and posting the code again. Remove the connector, clean with a throttle body cleaner, apply some contact "goo" and attach. You may also want to replace sensor to be sure. Good luck.