97 Chrysler LHS In Limp Mode! Help!

[Sammantha]

1997 Chrysler LHS - 3.5 Motor
On mother's day of all days the car went into limp mode. It seems to shift fine manually but obviously in limp mode it will not shift beyond the single gear allowed in order for me to limp home. I highly suspect that there is something electrical going on and not actual hard trans damage of any kind but I could of course be wrong. I had the system scanned with one of those heavy duty scanners and these are the codes that it tossed in my direction...

12 - Battery Power To Mod Disconnected
29 - TPS Signal
36 - Fault Immediate After Shift
53 - Gear Ratio Speed In 3rd
54 - Gear Ratio Speed In 4th
74 - Calculated Oil Temp In Use

I believe that 36,53,54 are the only codes that can send the trans into limp mode but not so sure about that so hoping someone might have some advice there too but what I mainly need to know is what I should be trying to do next to fix this issue so the car will safely come out of limp mode. I need to get the vehicle up and running without being ripped off and without wasting money trying to fix the wrong things, so any suggestions or advice would be greatly appreciated.

UPDATE: We replaced input and output speed sensors and that did not fix issue. Nor did trying another computer brain or EATX relay fuse. So now we are really lost and running out of options.

[troy1]

Wires rub thru behind the motor check that area for damage.

[thummmper]

this thread is a year old, but I wanted to say that "no voltage to module"
could be the father of all the other codes--
a transmission shop will scan the system for free and will know the trans situation better than a gas station.
the servo packs can go sideways in the 42le, as well as the torque converter and the clutch sensors on 3rd and 4th gears.
the servpack problem was a factory recall that was corrected in 1996. some of the mitsubishi subassemblies are of lesser quality, or used to be.
this is my second year studying the gen one kit- and I am quite impressed.