Manual Mode Unresponsive
Tap it once either way, no response. Try again, still nothing. Again but firmer.. nothing. Again, nothing. Again.. multiple downshifts or upshifts.. WTF.
Anyone had this happen before? I can't remember correctly but it seems I read somewhere that it could be due to the leaking pilot bushing but mine was inspected recently and found not to be currently leaking (replaced within the past 25k miles for the third time).

I suggest you try & use it for a few days with multiple reboots. If you never use it the micro switches might have got sticky with disuse.
The only thing that makes me think it is electronic & not the switches is that it remembered multiple taps & then gave you multiple downchanges etc.
People - we are talking 722.6 5 speed here. The 7G can go down & up multiple gears per tap left or right.
Glyn - in my car it has always been a bit dimwitted. Even from 25,000 miles sometimes it would take two inputs for anything to actually happen. I couldn't care less if it ever works again, it's a me-too feature that is poorly executed, I just don't want it to be a sign of something else I'm unaware of. No other shift problems - no problems out of park or anything like that ever.

Funny - I've always loved the manual tap change and use it often. In all three of my last Benzes it has worked perfectly as long as you don't try & anticipate it. You need to change at constant throttle opening even if that is WOT or over run.
If you try & anticipate the change by backing off just as the change takes place you will make a mess of it because the car is doing that anyway by retarding timing etc at the point of change.
I tried again yesterday with the same response (that is to say, very little response). I'll try again later today. If that feature dies, I won't lose sleep - as I say - I just thought I'd run it by you guys to see if it might be a symptom of something more sinister.
Trending Topics
With your previous leaking pilot bushings were there any oil in the electronic connectors? If so, it's possible that it triggered some transmission fault codes that are still stored in your car. These fault codes could be a bunch of minor ones that never trigger a malfunction message on your instrument cluster. And most OBD2 ScanTools can not pull transmission fault codes.
Next time you're car is hooked up to Mercedes-Benz STAR Diagnostic System, check for transmission fault codes. And don't forget to clear them. Best to clear fault codes using Mercedes-Benz STAR Diagnostic System.
A few tricks that might clear the bad memory is to disconnect then reconnect the battery (without using a memory saver) after a certain period of time, but you would also have to reset ESP, pano, window, radio, etc,... or disconnecting and reconnecting the TCU under the passenger kickplate might work too,..
If the memory get cleared, for the next 50km your car transmission will adapt to your driving style, again,... and hopefully, that manual shift mode feature will start working again.
The Best of Mercedes & AMG
With your previous leaking pilot bushings were there any oil in the electronic connectors? If so, it's possible that it triggered some transmission fault codes that are still stored in your car. These fault codes could be a bunch of minor ones that never trigger a malfunction message on your instrument cluster. And most OBD2 ScanTools can not pull transmission fault codes.
Next time you're car is hooked up to Mercedes-Benz STAR Diagnostic System, check for transmission fault codes. And don't forget to clear them. Best to clear fault codes using Mercedes-Benz STAR Diagnostic System.
A few tricks that might clear the bad memory is to disconnect then reconnect the battery (without using a memory saver) after a certain period of time, but you would also have to reset ESP, pano, window, radio, etc,... or disconnecting and reconnecting the TCU under the passenger kickplate might work too,..
If the memory get cleared, for the next 50km your car transmission will adapt to your driving style, again,... and hopefully, that manual shift mode feature will start working again.
I have replaced the battery a few months ago and even with no battery saver my car didn't require resetting anything but the windows - but it is a post-facelift car so they are less fussy like that.
I did try the feature again and again and it is not getting any better. It bugs me because I know it isn't functioning properly, but again I never use it so it's just one of those things. I did notice however that suddenly the light in the ashtray area AND the power outlet there have both stopped working as well, though I don't see how that could possibly be related.
I have replaced the battery a few months ago and even with no battery saver my car didn't require resetting anything but the windows - but it is a post-facelift car so they are less fussy like that.
I did try the feature again and again and it is not getting any better. It bugs me because I know it isn't functioning properly, but again I never use it so it's just one of those things. I did notice however that suddenly the light in the ashtray area AND the power outlet there have both stopped working as well, though I don't see how that could possibly be related.
kev




Probably just a setting in the ECU that could be set with SDS
but so far haven't heard of anyone doing it.
Yeah, it'a a pain. When I'm really hustling and using the gears
in a corner, I've gotten to know where the shift points are and hold the throttle to keep
it from downshifting in a corner.
Really sux when you're doing 70-75 in 3rd at 5000+ rpm and
brmmmmm....it drops to 4th and yikes!!!
Can be scary.
And yeah, if you are WOT it won't downshift if you have your foot on the floor.
Lift momentarily and then shift. Might take a couple tries.





