[Edo135]

Hi everyone,

In my m135i the transmission feels like it disengages when, for example, coming to a stop but not stopping completely to a stand-still and then going back on throttle; i can hear also a knock coming from the torque converter recoupling with the engine.
This happens in comfort mode and a little bit less in eco pro, not in sport because in sport you feel that the transmission is always engaged.

I would like to know if someone else is experiencing this. I've already took the car to the dealer to do a gearbox reset to see if that would have helped but no. It's very annoying and sometimes dangerous because when you have to react fast at a junction you think you have an immediate response from the engine when going back on the throttle but, instead, you have this delay of the transmission re-engaging.

I've experienced also a "lag" when you go from reverse to drive and you accelerate, you hit the gas and the car goes then happens this 1 second lag and then power comes again; this happens also sometimes when you're at a stop and you stay stopped for let's say 30 seconds and then you go back on the throttle.

In family we have also a mini countryman cooper sd all4, the last one after the restyling, and that, which has the same transmission, doesn't behave like this; yes, of course we're talking of a petrol vs diesel with totally different engines and gearbox setups, but just so you know.

I have to take the car back to the dealer for the clicking noise from the turbo/exhaust under load (see thread in the 2 series forum) and on that occasion i'll ask the techs to do a clutch calibration (if possible) to see if this works.

Appreciate your help. Thanks.

[Wing Co]

I can't say I have noticed it like you describe, but I have only done 600km. It is not as good as the 8 speed auto in my 8 Series was, but a step up from the 6 speed auto that was in my Mini. I think it will be a characteristic of this gearbox. All Audis, as well, appear to be like it according to YouTube - all must be emissions mapping for the gearboxes.

[dappercivility]

Originally Posted by Edo135

Hi everyone,

In my m135i the transmission feels like it disengages when, for example, coming to a stop but not stopping completely to a stand-still and then going back on throttle; i can hear also a knock coming from the torque converter recoupling with the engine.
This happens in comfort mode and a little bit less in eco pro, not in sport because in sport you feel that the transmission is always engaged.

I would like to know if someone else is experiencing this. I've already took the car to the dealer to do a gearbox reset to see if that would have helped but no. It's very annoying and sometimes dangerous because when you have to react fast at a junction you think you have an immediate response from the engine when going back on the throttle but, instead, you have this delay of the transmission re-engaging.

I've experienced also a "lag" when you go from reverse to drive and you accelerate, you hit the gas and the car goes then happens this 1 second lag and then power comes again; this happens also sometimes when you're at a stop and you stay stopped for let's say 30 seconds and then you go back on the throttle.

In family we have also a mini countryman cooper sd all4, the last one after the restyling, and that, which has the same transmission, doesn't behave like this; yes, of course we're talking of a petrol vs diesel with totally different engines and gearbox setups, but just so you know.

I have to take the car back to the dealer for the clicking noise from the turbo/exhaust under load (see thread in the 2 series forum) and on that occasion i'll ask the techs to do a clutch calibration (if possible) to see if this works.

Appreciate your help. Thanks.

I face the same exact issues issues. Have not brought it to the dealers attention yet. Had the car for almost a year now.

The part where it pisses me off is when accelerating hard from a stand still and you pull the paddles to shift up to 2nd gear, the car seems to cut power and come back on, albeit violently resulting in a jerk. Experienced this a couple of times, does not always happen but happens frequently enough for me to feel pissed about it.

[JOflatwhite]

Hi,

I'm new to the forum. I've had my M135i (2020) for over 12 months now and the transmission hesitation has been doing my head in. I've spoken to the Genius technicians at BMW a couple of times. In "D" the gearbox goes into hibernation mode at stop. This causes the slight delay when throttle engaged and transmission "comes to life". VERY annoying. It is unique to these Japanese gearboxes in the 1 & 2 series only. 3 series is not a problem I am told. Only fix is to get used to it (I have to some extent) and shift the gear select to Sport - where the gearbox remains activated at stop.

I've thought about selling the car as I hate this hesitation, however I love the car otherwise. I wish BMW could offer a remapping as I can't be the only amateur who believes this hesitation is not totally frustrating, if not dangerous. It also results in non linear power delivery. You get a surge of power after initial hesitation. Thanks all. Hope someone can offer a possible fix.

[cukeuk]

I set my car to sport individual with everything to comfort aside from the gearbox set to sport...

[Paia]

hello...
we have the same problem ,and more...
the car is tuned,first we had 2nd to 3d gear problem,slipping and then fault and safe mode and hard shifting from 2nd to 3d
4203A1 gear ratio monitoring , Gear 2 : Clutch C1 or B1 open incorrectly
4217E1 Transmission ratio monitoring ,reverce gear : clutch C3 or B2 Jammed
421809 electronic pressure control valve B1 : minimum pressure

replace the gearbox with used, use the old TCU and the problem is the same, so the problem was from TCU. then i use the used one from the used gearbox and had a problem from R to D the gearbox has hard shifting harder after a long drive. does any one have a note from the valvebody pressure valves?

do not tune the car , only a light 1st stage

[Erebor]

What are the torque figures of your tune? The gearbox is rated for 480Nm, so I wouldnt go far beyond 500.

[Soul_Glo]

Just seems like a clumsy transmission to me. I think it’s a feature of the box and it’s definitely not well matched to the car. Fumbling for gears at times. I’ve driven a few when I visited a friend and the engine notes weren’t even pleasant. They should have stuck with ZF.

[Erebor]

Originally Posted by Soul_Glo

Just seems like a clumsy transmission to me. I think it’s a feature of the box and it’s definitely not well matched to the car. Fumbling for gears at times. I’ve driven a few when I visited a friend and the engine notes weren’t even pleasant. They should have stuck with ZF.

Yes, they should have, but ZF didn't have a fitting gearbox to use at the time. There are rumors, that BMW will switch to the new ZF 9-speed for the F70.

[Soul_Glo]

Originally Posted by Erebor

Yes, they should have, but ZF didn't have a fitting gearbox to use at the time. There are rumors, that BMW will switch to the new ZF 9-speed for the F70.

That would be awesome if they do