e53 hard downshift is killin me
 

dear all
first of all let me say hi to all of you members
i have can replicate my problem whenever i want since ive rounded it up:
the car downshift extremely hard (i always think ill leave my tranny on the road behind me whenever the car downshifts ON LOW RPMs, when i ask for some extra power) .
it does not do that when i drive on sport mode or when i keep RPMs high
tranny security mode is always on when the bang occcurs.
any toughts anyone?

i ve had a garagist update the gearbox software

could it be a bad version?
could it be a transferbox failure? FYI the gearbox is new
tkx in advance

how old is your X? How many miles? Your tranny might be heading south, have it checked by a dealer or an indy shop.

tkx for ur reply
its a 2001 4.4i with 100k miles - new gearbox tho

Hi, your problem is the program and need a specail tool to reprogram such as the GT1. dealer can do it or special caragist but don't worry your gearbox is fine and will not be effected by this error.

Reprogramming didn't help mine unfortunately. I still have that dreaded 5 mph rolling stop downshift bang. I can live with it for normal driving, but when it happes with the 5,000 LB trailer in tow, the entire car jumps the bang is so severe. Thank heavens for 6/100 warranty, because there's no way this trans is going to survive. Dealer has had it three times and just keeps returning it to me saying "they all do that">

I just had my transmission software update with BMW b4 my warranty ran out. It drives even better than b4. More responsive accelrtn, and smoother downshifting down hills and to lights. I just hope its not temporary.

Im on my third tranny... gosh... im startin to miss my honda

I also have that harsh downshift and the dealer said the software update has already been done. But I think he is lieng. Trying to get it fixed or might have to live with it.

is there any way to know the latest version software available out there and compare it to the current car version from nav screen? maybe through hidden menu?

my invoice doesn't give any specific software version. Here's what is on the invoice...

J# 1 26BFZ AUTO TRANSMISSION HOURS: .75

OWNER STATES THAT TRANSMISSN STICKS
AT LOW GEARS WHEN DECENDING INCLINES...
WILL NOT UPSHIFT GOING DOWNHILL
SIB FOR SHIFTING CONCERN
REPROGRAMMED THE EGS PER SIB.

I told them that I wanted the latest software upgrade and they took care of it. No charge under warranty.