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I'm not clear on what you mean by: "Mode Light".
there are dozens of indicators on the dash, and some of them have multiple functions.
on model year 2010 and up, there is an "Eco Mode" that displays on the left display, with tachometer.
there are also specific warning codes that flash across the odometer display, with the speedometer. A particularly lethal code is: "Hot Oil". I experience this code driving 8 mph in the soft sand dunes of the outer banks NC. Less than 3 minutes later I lost all forward and reverse gears. The automatic transmission had overheated, due,to the the fact that Wrangler JK's do not engage the torque converter in 4WD High range until 3rd gear. So use Low-Range with automatics 2007-2012. The 3.6L 8-speed automatics do not have this problem 2013-newer.
Can you describe the color, location, shape, and possibly provide a picture?
sounds like the gear box ecu has a fault. should have a light on the dash board flashing if not the bulb may have gone. is the speedo working as gear box faults can make it say you are not moving. some time can be fixed if you take the battery off give it a home charge. 2 - 3 hours then put back on but remember you will need the code to put back in the radio when the battery is put back on so would find that first before taking off the battery
Most modern day autos are all electronically controlled, Usually if it detects a fault it can go into limp mode which by default is 3rd gear. The fact your speedo is not working which too is most likely sensor driven then that may be a clue to what is wrong. No speed sensor, no speedo and the transmission control unit is not getting the vehicle speed sense either. So it has no way of knowing what gear to be in or any shift points. I'm thinking it's a sensor issue would be my best guess.
Sounds like inside the gearbox
As its 2gears i would be looking at these problems first. Fifth and reverse are on same shaft
1) clutch fault
2) lay shaft broken or bearing carrier. Collapsed
3)synchro blocker rings worn
Friend, start the engine and let it run a few minutes to warm the trans fluid, set the park brake or block the front of the wheels, put the car in drive position and check the transmission fluid. Sounds like it's just too low for the pump to pick up enough for a forward engagement. Reverse doesn't take much to activate the servo. Most automatics are this way. I'm sure you'll find the fluid is way low and needs the proper fluid added. This may mean you have a slight trans fluid leak.
These transmissions are computer controlled, and this sounds like you have electronic problems coupled with mechanical transmission problems. I suggest you consult a transmission specialist to diagnose your problems.