Steptronic downshift problem
I've had an odd and disturbing thing happen twice now with my 2004 coupe with Steptronic. While cruising on the interstate at 60 mph or so in moderate traffic, I've floored the accelerator to pass. After an initial downshift, the transmission shifted up again to the original gear while the accelerator was still floored. It's only happened twice in about a year, but this could be quite dangerous if you're aiming for a hole in traffic and the car responds in this unpredictable way.
Has anyone else had this happen? Anyone have a clue as to the cause?
Re: Steptronic downshift problem
That is a new symptom that I have never heard described before to my knowledge. And your right, could be dangerous. The only self diagnostic I could recommend would be to disconnect battery at both negative and positive terminals let them touch together for some time and let all the computers including the transmission EGS computer zeroize. This should be done for several hours to ensure this reset has happened. Then reconnect and start driving again to have the STEP EGS computer (the adaptive part of the STEP Tranny) start learning all over again and do some aggressive passing techniques.
The bad part in this is all the consequential resetting of everything else in the car including, but not limited to: NAV addresses (I think), date/time, other settings for entertainment, and even possibly CBS calculations (but here I am not sure as well)
Otherwise, and my first choice, would be to take it in to dealer, describe symptom and they will probably update software in hopes the EGS gets new programming and / or do something similar to what I described but able to save and restore your settings.
Dang this is a strange one. Keep us posted
US '05 645 Coupe, Silver Grey, Chateau, Sport, Logic 7, HUD, Cold Wx Pkg, SIRIUS Sat Radio, Aux Input, Bluetooth w/ snap in adapter, V1 CIP 20.02 w/MP3 enabled - Great, great BMW!!
Re: Steptronic downshift problem
Had a similar problem the last couple of months on an '06 650 with ~11,000 miles. A number of times when I was driving around 30-40 mph and punched the accelerator, very slow response, almost like a turbo lag. Service manager found the same problem, found no open bulletins and submitted a PUMA case. Was informed that they adjusted the valve clearance from .8mm to .3mm (if I got the info correct). I had suspected it was a software/transmission issue like my '04 645 had. Tried it in a number of different scenarios last couple of days and all seems good. Hope this info helps.2004 645CiC - Jet Black, Cream Beige, Sport, Step
2006 650i Conv. - Stratus Grey, Black, Sport, Step, HUD
Update -- Steptronic downshift problem
Car was in for service Monday. No error codes were found. Latest software upgrade (23.02) was loaded to fix an unrelated issue but, as the upgrade includes the entire car's controls, it may help the transmission's behavior. Time will tell -- I'm optimistic about it. Initial impression is that the car is livelier.
Re: Update -- Steptronic downshift problem
Too bad you did not get PROGMAN (CIP) 24.00.00 just released the first of the month. Fixed a couple of things they mada bad in 23.02.
Check your eyebrow lights (yellow). Many reports on e60s (no e63s yet that I know of) of these lights not working after upgrade to 23.02. Also hosed up working MOST iPod interfaces on several models.
US '05 645 Coupe, Silver Grey, Chateau, Sport, Logic 7, HUD, Cold Pkg, SIRIUS Sat Radio, Aux, BT w/ snap-in adapter, V1, CIP 21.03 w/MP3 enabled
Eyebrow lights not OK after all
Interesting, hadn't thought of possibility of showroom car (M6 conv.) being screwed-up. Can't really tell your inboard lights are on in daytime pic. Looking forward to seeing the nighttime one.