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Old 02-17-2013, 04:55 PM
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Location: Claremont California
Join Date: Mar 2010
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Mein Auto: 2005 545i
Originally Posted by chinesestunna View Post
Hi everyone!

I just bought a 2005 545i with 77K miles and noticed a strange behavior:
When I start accelerating from a light, under light throttle driving in D, the transmission would change from 1st into 2nd at around 1500-1600RPMs and I feel a slight slip before it fully locks up. If I accelerate harder the issue is less pronounced or outright gone. DS mode will stay in 1st longer and higher RPM so doesn't have the issue as much either. I have done the transmission 30 second reset already and it has lessened the issue a bit
I've done a good amount of searching and reading and it seems Bimmer owners say this is normal behavior? This is my first BMW so I'm just not sure. Should I do a transmission fluid change? Not a fan of BMW's "lifetime fluid" concept...

The previous owner had all records and it seems that all "prone to fail" items on this model has been changed out already such as mechatronic sleeve, valley coolant pipe, brake vacuum booster etc. All maintenance done on schedule as well pre-purchase mechanic (the shop a good friend's been using for 10 years) said everything is good and checks out.

Thanks in advance for your thoughts.
I had the exact problem that u described on my 05 545..
I had the tranny updated and the problem was solved ,, it's been close to four years now since I had it done ,,,, the tranny has never surged again,,
Ur getting good advice on a tranny fluid change , I just recently did my third tranny fluid change at 90,000 mi, and she shifts like new ,, I think it's crutial to maintain the tranny fluid clean,, due to the silinoids getting clogged when fluid is not changed frequently.

Hopefully a simple fluid change will do the trick,, but having been thru the same problem an update will defitnately fix the problem,,
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