2-1 rough downshift
Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
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From: Nevada
2014 E63S, 2018 GLC 300
2-1 rough downshift
2018 GLC 300.
I notice coming up to a stop and just as the vehicle comes to a stop and when it shifts down to 1 from 2 the vehicle slightly lunges. Anyone have that "feature"?
Also, I have noticed the vehicle does not always downshift to 1st at a stop but stays in 2nd. Any ideas?
Will see the dealer next week.
I notice coming up to a stop and just as the vehicle comes to a stop and when it shifts down to 1 from 2 the vehicle slightly lunges. Anyone have that "feature"?
Also, I have noticed the vehicle does not always downshift to 1st at a stop but stays in 2nd. Any ideas?
Will see the dealer next week.
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From: Ireland
GLC 300d 4matic
I've had very occasional very rough downshift from 2 to 1.
Haven't done anything about it.
Mine always changes to 1st at a complete stop and also on start up....though others say theirs always starts in 2nd (dependant on drive mode selected )
Haven't done anything about it.
Mine always changes to 1st at a complete stop and also on start up....though others say theirs always starts in 2nd (dependant on drive mode selected )
Thread Starter
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From: Nevada
2014 E63S, 2018 GLC 300
I drive in "C". The first 1,000 miles I had it it always dropped down to 1st at a stop. Now in "C" it occasionally drops to 1st and occasionally drops to 2nd. 2nd does not seem correct even in "C" with this vehicle. My AMG does it in "C" but that makes sense with a large TTV8 and it is consistent.
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19 GLC300 4M (lunar blue/black/black ash aluminum),17 GLE350 4M (selenite grey/ espresso/eucalyptus)
I drive in "C". The first 1,000 miles I had it it always dropped down to 1st at a stop. Now in "C" it occasionally drops to 1st and occasionally drops to 2nd. 2nd does not seem correct even in "C" with this vehicle. My AMG does it in "C" but that makes sense with a large TTV8 and it is consistent.
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From: Palm Beach, Fl
2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
It does NOT go into first gear in comfort mode. It starts and stops in 2nd....for comfort. If you are in sport it will start and downshift back to 1st. I have a 2018 also and yes I notice it dropping down into 1st when in sport and sometimes a bit jerky. I leave it in comfort for the best comfortable ride and it shifts nicer and properly. If conditions need I then switch into sport to maneuver some traffic or nice roads, but comfort is the best ride and drivablity under normal conditions.
Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
Likes: 35
From: Nevada
2014 E63S, 2018 GLC 300
It does NOT go into first gear in comfort mode. It starts and stops in 2nd....for comfort. If you are in sport it will start and downshift back to 1st. I have a 2018 also and yes I notice it dropping down into 1st when in sport and sometimes a bit jerky. I leave it in comfort for the best comfortable ride and it shifts nicer and properly. If conditions need I then switch into sport to maneuver some traffic or nice roads, but comfort is the best ride and drivablity under normal conditions.
I guess we will see what happens at the dealer. Maybe they will do an adaptation of some sort. I know the adaptation greatly improved my E63S' transmission.
Last edited by Sugar_Mouth; Dec 13, 2020 at 06:40 PM.
Senior Member
Joined: Jan 2019
Posts: 497
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From: Palm Beach, Fl
2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
Interesting. Mine dropped to 1st on C every time up till a week ago when it would drop to 2 occasionally in C. Currently it might drop to 1st for a few stops then drop to 2nd for a few stops throughout the day. All in C.
I guess we will see what happens at the dealer. Maybe they will do an adaptation of some sort. I know the adaptation greatly improved my E63S' transmission.
I guess we will see what happens at the dealer. Maybe they will do an adaptation of some sort. I know the adaptation greatly improved my E63S' transmission.
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19 GLC300 4M (lunar blue/black/black ash aluminum),17 GLE350 4M (selenite grey/ espresso/eucalyptus)
Try switching out of Comfort and then back. Maybe your car thinks it is in sport. Just a suggestion, it may not work.
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Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
Likes: 35
From: Nevada
2014 E63S, 2018 GLC 300
Super Member
Joined: Apr 2020
Posts: 682
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19 GLC300 4M (lunar blue/black/black ash aluminum),17 GLE350 4M (selenite grey/ espresso/eucalyptus)
Hmm... Not sure then. Have a service coming up soon? Or take it to dealer. Looks like not many people have the issue.
Super Member
Joined: Apr 2020
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19 GLC300 4M (lunar blue/black/black ash aluminum),17 GLE350 4M (selenite grey/ espresso/eucalyptus)
Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
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From: Nevada
2014 E63S, 2018 GLC 300
Update: Did a tranny adaptation and fixed it. The trans shifts down to 1st in "C" as it did before. The dealer confirmed in "C" it should shift down to 1st. The lunge from 2nd to 1st on downshift is now gone and smooth.
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2020 GLC 300
Maybe different countries do it differently. My GLC never starts in 1st gear unless I'm in sports and my VW Tiguan does exactly the same thing with its DSG gearbox. All the Euro cars I driven in Australia do this for fuel efficiency and comfort reasons, but apparently not every country based on your experience and the forum here: https://mbworld.org/forums/glc-class...-1st-gear.html
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19 GLC300 4M (lunar blue/black/black ash aluminum),17 GLE350 4M (selenite grey/ espresso/eucalyptus)
Oof. If you are in US, then it means you should have the same as mine, which does not go to 1. The dealers don't know anything.
Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
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From: Nevada
2014 E63S, 2018 GLC 300
No there is more to it. The main issue is the 2-1 shift regardless in C or S. The other is there is an odd downshift behavior which feels like it will drag in a gear as it down shifts. Additionally, it will occasionally do a 2-1 slam into gear if on a hill.
Senior Member
Joined: Jan 2019
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From: Palm Beach, Fl
2016 S550 sport, 2018 GLC300, M3, Zo7, 2021 Sierra Denali
1st is a very short gear. Are you sure its going down to 1st. You would be coming to a stop, its so slow. Even if you started off in second to get 1st you would be flooring the car. Also if you were in sport it would not downshift to 1st unless you were coming to a stop. Sound like its flaring or hanging in gear also. That can happen on a hard acceleration then just let off the pedal, sometime a trans will hang?
Thread Starter
Senior Member
Joined: Mar 2014
Posts: 339
Likes: 35
From: Nevada
2014 E63S, 2018 GLC 300
Correction. I have found the issue in "C" not in "S" as I stated above. I found the downshift to 1st in "S" works well, the downshift to 1st in "C" does not. As others have stated it seems odd mine downshifts to 1st in "C" and might be the issue. The slight drag on higher gear downs shifts is odd and was eliminated after the tranny adaptation and has since come back. I will push the conversation regarding the shift to 1st in "C" Saturday.
