Rough downshift when accelerating
Thread Starter
Newbie
Joined: Jul 2024
Posts: 3
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2015 ML 350
Rough downshift when accelerating
I have a 2015 ML350 and when accelerating up a hill the car will have a rough shift from 5th to 4th gear. At no other shift is it rough. Has anyone else experienced this?
Out Of Control!!
Joined: Apr 2019
Posts: 11,923
Likes: 6,776
From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
- Fresh tranny service
- 722.9 fresh adaptations
- Fresh engine oil service
Then you'll have to get creative.
These trannies shift extremely fast when the ECU let them.
Banging shifts are the opposite of best: delayed sloppy shifts ie. "best effort" shifts - Look outside of the box for solutions.
Do you recognize you gears are always shifted too early. Like 30mph in 5th gear ? That's the ECU throttle not tranny.
Member
Joined: Jun 2025
Posts: 163
Likes: 57
From: Australia
2014 ML63, 2018 GLC43, 1929 DB victory six sports roadster
Does it happen in all driving modes? Try a tranny adaption reset and then drive it how you normally would for a few days and it should re learn your driving habits. They learn very quickly, I can notice the difference in mine if someone else has been driving it. Mine downshifts pretty hard but it has the quick shift transmission.
MBWorld Fanatic!
Joined: Jan 2009
Posts: 3,829
Likes: 592
From: NY & FL
MB’s of all kinds.
Transmission fluid change is essential for keeping these gearboxes shifting correctly. Change the fluid often. Around every 40k miles or so for normal driving conditions.
