2002 neon tranny probs...spedo doesn't work..changed both input and output speed sensors, trans in limp mode obd2 codes 1698 and 500

Unfortunately, you should have gotten the diagnostic codes for the transmission before messing with the shift solenoid. Most of those dodge shift issues are caused by input and output speed sensors.

Wiring problems , worn parts in the transmission .

the output speed sensor is going bad,or may have a broken wire on the connector.repair r the wire if so,or replace the sensor.Transmission goes into limp mode to protect it'self,and engine,from internal damage. repair this,and you should be good

Check all the wiring to that sensor

P0455 = Evap leak monitor large leak detected.
This code usually means the gas cap may have been loose or needs the rubber gasket.

P0500 = No vehicle speed sensor signal.
Vehicle speed sensor is located on the transmission near one of the axle shafts (it may need replacing).

P0700 = EATX controller DTC present.
This simply means you have transmission related codes.

P0732 = Gear ratio error in 2nd gear.
This code is of some concern, it means the transmission is slipping in 2nd gear. However the trans may be in limp mode due to the speed sensor code (limp mode means the trans starts out in second gear in order to at least get to a mechanic). The first thing I would do is have these codes cleared as there may be absolutely nothing wrong with the transmission (especially if you pull the trans dip stick and the fluid does not have a burnt smell. The vehicle should drive normally after that. If the check engine light comes back, have the codes scanned ASAP (before any other unrelated code sets). Chances are it may be the output speed sensor if this happens (easy fix). Hope this helps

Regards

it may, ive seen them throw codes like that on the neon. i would clear the codes and see if it comes back, if u havnt already. i have changed the solenoid packs before for that code as well. mounted up front above the tranny pan. expensive part, easy to change. hope this was helpful

your truck is in limp mode,
have someone check the output and input sensors on the transmission

It's neither. That trans does not have a band. If you had only one gear ratio error it could possibly be speed sensor but not 2. Sounds like either shaft broke inside or sun gear.

Check the speed sensor on the tranny cause if the speedometer is not working the tranny will not shift.The computer will not recognize that the transmission is in motion so will not shift.

more than likely it is a trans speed sensor..you didnt say if the check engine light is on but i am assuming it is. the input or output sensor failing will put the trans into limp in mode