1998 dodge stratus trans trouble code but everything is shifting right and gauges are all working

P0920 Gear shift pos circuit range/perf
P0921 gear shift pos circuit low
P0999 trans fluid press send/switch f circuit low

First p0700 is only a generic information code. If you haven't received another code you probably have one pending, have it scanned again. I would start by checking trans fluid level. I believe with the stratus you check you transmission with the car in neutral, at operating temp and on flat level ground with wheel chocks to make sure car doesn't move. fluid should be a nice red color and clean. If orange its probably burnt or in need of service, if black probably needs repairs. If that looks good depending on your code I would say a trans shift solenoid went bad. Keep me updated with that other code.

watch this video Transmission No Shift Case Study P0888
other code is because the other code is still active.

if it doesn't have trans codes, have the fluid checked or changed if it has not been serviced recently.

Stuck is 2nd means it's in limp in mode. Get the trouble codes scanned to find out what's going on.

Had same problem with my 2000 dodge stratus 2.4 liter and transmission would not shift out of 1st gear. Solution was ignition fuse under the hood was blown, one side of fuse working, replaced 10 am fuse everything works, tach, speedometer, gas gauge and transmission started back to shifting.

Replace the gearbox.

Check the input shaft and output shaft speed sensors on the transmission. One is likely bad.

I have a 1999 Ram B 1500 Van, auto transmission, 5.9 L engine.
Same problem, trans hesitates in 2-3 upshift, sometimes 1-2
to 2-3 upshift. Posts trouble code P1756 - Transmission Govenor pressure too low at below 15 to 20 Psi. Transmission pump shot or valve body leak stops trans from reaching proper pressure to shift, which is minimum 15 Psi.
Either trans is leaking in valve body, valve is stuck, shift solenoid on valve body is sticking, or pump is shot.

Have you run a test for trans trouble codes, sounds like a shift solenoid has failed or a defective connection to the trans from the control module.