BMW X3 transmission

Read out the error Codes ( poss. 2750 and/or 2751 ?).
It could well be that the throttlebody or maybe cables/plug connection is causing this problem and the 4x4 as the dsc may also be disrupted (error Code 5f1d ?) if the throttlebody function is defective. Try cleaning it & check all its electricals are good. Clear the faults and test drive. If you're still getting transferbox problems, check the actuator/plastic gear and maybe change the transferbox oil AND reset the adaptions.
Hope this helps

Just a guess, but your transmission might be throwing out a code that there is an issue with it shifting into 3rd gear. I would suggest taking it to a repair shop that is capable of scanning the computer to figure out what the issue is...

BMW has been using electronically controlled automatic transmissions in most models since the late '80s. These transmission systems employ a transmission control unit which controls electrical solenoids to manipulate the various control and shift valves and functions in the transmission valve-body. When the transmission control unit detects a problem that it "thinks" could be damaging to the transmission or engine, it goes into a fail-safe or "limp" mode. In this mode, the transmission will function in reverse normally, but in forward it will operate in only one gear (whether you have the shifter in D, or any of the lower gears). This will typically be 3rd or 4th gear, depending on the model. It will start in this gear and stay in this gear with no shifting. You would experience this as sluggish acceleration and higher than normal engine speed at about 40-mph and above.
If you must drive the vehicle when the transmission is in the fail-safe mode, accelerate gently and keep the road speed lower than full highway speed.
Earlier models do not employ fault codes and must be diagnosed manually. Late models do employ fault codes and a diagnostic/scan machine can be used to check and read the faults to assist in diagnostics. Note that this is not your common OBD-II engine management fault code tool. This is what A BMW dealer or a properly equipped independent shop would have for full vehicle system diagnostics and coding operations.

Hi my name is Stanton I have a problem with my bmw x3 2004 model when it is in 2 gear and when it must change to 3 gear it go into limp mode

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BMW has been using electronically controlled automatic transmissions in most models since the late 80s. These transmission systems employ a transmission control unit which controls electrical solenoids to manipulate the various control and shift valves and functions in the transmission valve body. When the transmission control unit detects a problem that it thinks could be damaging to the transmission or engine, it goes into a fail-safe or limp mode. In this mode, the transmission will function in reverse normally, but in forward it will operate in only one gear (whether you have the shifter in D, or any of the lower gears). This will typically be 3rd or 4th gear, depending on the model. It will start in this gear and stay in this gear with no shifting. You would experience this as sluggish acceleration and higher than normal engine speed at about 40 mph and above.

If you must drive the vehicle when the transmission is in the fail safe mode, accelerate gently and keep the road speed lower than full highway speed.

Earlier models do not employ fault codes and must be diagnosed manually. Late models do employ fault codes and a diagnostic/scan machine can be used to check and read the faults to assist in diagnostics. Note that this is not your common OBDII engine management fault code tool. This is what A BMW dealer or a properly equipped independent shop would have for full vehicle system diagnostics and coding operations.

Does it have a funny clicking noise that you can hear underneath the car? If so , then the transfer case motor plastic gear is stripped. You can buy a new one at the dealer for a mere $1300 , or one on ebay for about $900, or if you are handy, you can buy just the gear on ebay for about $25 bucks, take the motor out and change the gear. There are good youtube videos of how to do this. I did this on a 2007 x3 and it wasn't too painful.

I have a bmw x3 that is making a banging noise when slowing down or crawling in traffic. it has just passed its mot had new front brakes and handbrake.
has any one experienced this or can help me to solve this problem.

good day, you may try replacing your automatic transmission fluid, a good run will be noticeable, hope this helps, have a nice day

Hello.

My first solution would be to change the transmission oil.