Flashing prnds with 17090 error code

You need a scanner to check for codes.

You seriously need to consider getting another vehicle.

It is entirely possible to suddenly lose reverse like this if a shift solenoid or shift valve fails.

I'd expect though that there would be a trouble code showing on the dash. Some cars do this by blinking the O/D indicator light, so check that the Check Engine and O/D dash warning lamps all work by observing them when the ignition is first turned on and in those few seconds when you hit the starter.

DOES THE INDICATION OF THE GEARS FLASH OR STAY LIT UP?

Sounds like a problem with the selector switch. It is unlikely to be gearbox issue. I suspect the gearbox is being "told" to go into neutral!

Back to the dealer with that one so they can do a can bus test on the selector lever...

this is the jeep obd codes
Jeep OBD Error Code ID Chart

hello. Here are some of the transmission slipping signs you should be looking for:

• A delay of more than a second in shifting from the neutral to drive or reverse gear, could mean that there is a problem with the transmission. If on changing from a neutral or park position to the drive or reverse gear, the car does not immediately catch the gear and move forward or backward, then it could mean a problem in the transmission.
• If you change gears, and you hear a sudden clunk or sudden jolt or shudder, then the shifting is not smooth and there could be a problem with the gearbox.
• If the engine rpm keeps increasing but there is no increase in the speed, then it could be a sign of the transmission slipping.
• Another one of the transmission slipping signs is oil or automatic transmission fluid (ATF) leakage. This could damage the transmission.
• If your car has suddenly started sounding noisy, then it could also be because of a problem in the gearbox.
• Most automatic transmission systems, nowadays, have a check engine light or an OD light, which flashes if there is a problem with the engine. You will need a code reader to diagnose the problem by reading the code.

you need to readjust your cable.

most likly the trans is just plain worn out you could have it rebuilt or replace it with a used one