I have an issue with my bmw x5 e53 regarding pixel loss on the radio and instrument cluster. Its begining to be a safety issue because I need to read data of the screen but makes it impossible sometimes taking your concentration of the road. Regards, Bill

If you take your registration ducument to a BMW dealership they will tell you the code for free, based on the VIN number.

Or look in the Glovebox for a small white sticker, or in the Owner's manual.

But, I found this

BMW hasn't used a "radio code" since the beginning of the e38/e39/e53/e46 generation of BMWs. That technology ended with the anti-theft radios used in BMWs prior to the aforementioned e series.

The code you see appearing on your nav screen or MID (you didn't indicate which radio setup you have)...is an anomaly of the OBC's immobilizing code probably brought on by the low voltage issues you were having. There have been many threads on this topic across multiple BMW forums in that usually a simple use of "0000" or "1234" works to get past the lockout once the battery issue or low voltage issue is fixed...or initiating the emergency deactivation of the CODE found in the owner's manual.

and this confirms it is the immobilizer code

https://www.bimmerforums.com/forum/showthread.php?2270312-radio-code

..

Fuse box is located behind glove box and check fuses No. 26, 32 and 33

https://www.youtube.com/watch?v=rQn5J47ElwU

Check online BMW Workshop Manuals for X Series E53 X5 3.0d (M57) in the attachment: http://workshop-manuals.com/bmw/x_series_e53/x5_3.0d_m57_offrd/2_repair_instructions/12__engine_electrical_system_(m57)/21__preheating_relay/1_ra__removing_and_installing_replacing_relay_for_glow_plugs_(m57)/

Diffen Gunari

The lights are all on because of a loss of power. If you test drive the car, once you reach 15 mph, the lights should reset. Matching the cluster will set the odometer to the CPU odometer (actual miles).

not sure on X5 but on 5 series it meant -
U112B - No message from instrument cluster, could instrument cluster fuse. Could try disconnecting and reconnecting battery to see if that clears it. (Make sure you have radio code before disconnecting)

check if your radio ground wire is tight

NO! Filter is not in the tank!
As the car underneath the plastic cover under the driver's side. The cover is long after the left rear wheel! Filter at the beginning of the cover in place as a diagonal.
!!!!!!!!Beware, very badly off her!!!!!!
Placement of the filter is the same for all X5 E53

BMW has a free fix for that! It's a factory recall with the pixels. Check with your dealer.