2004 BMW 545i Q&A

2004 BMW 545i Question: how do you check transmission fluid

at 35 to 40 shifts in and out of overdrive -
Answer 1
at 35 to 40 shifts in and out of overdrive: Under normal excelleration, this is the normal speed for the converter to lock up...unless it does what I call "being busy". In and out and in and out, repeatedly. If this is what's happening, you have a bad torque converter pressure switch. -
Answer 2
I HAVE THE SAME PROBLEM ON MY 545I THE TRANSMISSION SOFTWARE NEED TO BE UPGRADE OR THE SHIFTRONIC INSIDE THE TRANSMISSION WILL COST OVER $4000... EASY -
Comment 1
I have the same problem in my 2005 545i. How do you upgrade the transmission software? -
Answer 3
I had the same issue until my transmission malfunction light came on...I took it to several Transmission shops only to find that my transmission oil pan was leaking and had been for sometime. The filter, pan, and transmission gasket come as an assembly so all of that was replaced. When the shop drained by transmission I had 2 quarts out of 2 gallons. I was lucky the transmission did not burn up. Anyway...I had new fluid, and the pan, filter, gasket assembly replaced for $650 and once the computer reprogrammed itself my car is good as new. -
Answer 4
where is the dip stock located to check transmission fluid located? -
Comment 1
It is not under the hood. Fluid must be checked on a lift. -
Comment 2
right hand side of the rear of the box an 8 mm haxgon key allen key inthe uk open and check really you do need a lift answer #3 look for that if you under the car -
Answer 5
A year late tot he party but i had the same issues with my 2004 545i. Really concerned me and mechanics could not recreate or pinpoint the cause. Along with this I was having massive electrial issues. Eventually(well over a year) it was determined that I had a faulty alternator. Once that was replaced the banging(transmission issues at 35/40mph) went away. Have your alternator replaced or checked. -