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This could have something to do with humming noise, you could drain and refill fluid with full synthetic. If that does not help you would want to bring vehicle to shop where a mechanic with seasoned ear can listen to problem. Here are instructions to change fluid. Let me know if you have questions. Thanks
REPLACEMENT OF TRANSAXLE GEAR OIL
You will see drain plug lower rear of transmission. The fill plug is on upper front transmission it is a rubber plug. I would personally recommend using AMS OIL 75-85 just so you have the exact same specifications your manufacture recommends. You may have to order this off the internet if you do not have a local ams-oil dealer. Let me know if you have questions. Thanks
If the fluid was not working it would cause problems in all gears instead of just the 2.3. If you are having shifting problems you would want to bring your vehicle to the dealership so they can access transmissio codes "cheap scan tools cant" if they pull a code you would want to replace whatever part code says. You could try to get some AMS-OIl Transmission fluid and have it flushed with that to see if it helps. If not you likely have a internal transmission problem. Here is a copy of that tsb. Thanks
2003 Jetta left rear window blue plastic part of the