Chrysler Repair: electronic transmission codes 500,700,731, 2000 chrysler 300m, chrysler 300m

Question
Have a 2000 Chrysler 300m.  A week ago had a problem with car going into 2nd and staying there while drivinf "Limp-in mode"  went to Autozone and borrowed their scanner "for free I might add" and got the codes in this order P0731/P0700/P0500/P0700.  Yes P0700 twice. Any sugestions?  Thank you in advance.
Marc Raychard

Answer
Hi Marc,
The 500 means there is no signal from the output speed sensor. and that needs to reach the transmission controller. I would check the wiring and if no obvious wire damage is present then replace the output speed sensor. The sensor is on the left side of the trans, about midline height, all the way at the very rear of that side. There is a an input turbine sensor at the front end of the trans, same side, same level that is comparable in appearance. The dark blue/black wire should be continuous at pin 13 and the light green/white to pin 14 of the trans controller if you want to verify the wiring. The trans controller has a 60-way plug and is located on the left front side shield of the engine compartment, forward of the power distribution box and abs controller if you have that as well.
The 731 says there is a speed gear ratio error in 1st gear, but that may be due to the lack of the output speed sensor signal. So don't worry about that yet.
The two 700's just are notifications that the trans controller has found the previously noted fault codes.
You may be in luck. The output speed sensor when replaced may solve the limp-in. If not, let me know.
Roland