2017 CLS63S Issues
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CLS63S, Sprinter 2500
2017 CLS63S Issues
Hello, I have a 2017 CLS63S I have had for close to 2 years now. The car is still covered under CPO warranty, unfortunately I have had no luck with Mercedes diagnosing the problems I am having with the car. On two occasions now while driving, the area of my gauge cluster where it shows my gear has gone out and I can not accelerate. The engine revs but the car does not put the power down. I have this on video both times. Another issue I am having is when the car shifts from 3rd to 4th I notice a loss of power, each shift up until this feels smooth. I also have a video of this but not sure how evident it is in video. There is also a new issue that has risen, if I am at a dead stop and put my foot to the the floor, the car seems sluggish for the first 20mph. It revs up to about 2k rpm and holds it for a second before the power really kicks in. On top of all this there is also a whining noise I notice in lower gears at full throttle, sounds very similar to a supercharger. I have been trying to resolve the issues with this car since the day I bought it. If anyone has had a similar experience or has heard of these issues please let me know. Can PM videos if anyone is interested. Thank you
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Joined: Apr 2009
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'06 MB S55 AMG; '04 Audi Allroad 4.2; '05 BMW M3 Conv.; '92 MB 500E
This might be one of those "disconnect the negative terminal on the battery for an hour" things. Let the computers reset and see what warnings come back. Also, as indicated above, make sure the dealer has flashed all of the correct software updates to the car.
maw
maw
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2018 CLS63s 4Matic+
Same issue on my 2018, even after fresh transmission rebuild
Hello, I have a 2017 CLS63S I have had for close to 2 years now. The car is still covered under CPO warranty, unfortunately I have had no luck with Mercedes diagnosing the problems I am having with the car. On two occasions now while driving, the area of my gauge cluster where it shows my gear has gone out and I can not accelerate. The engine revs but the car does not put the power down. I have this on video both times. Another issue I am having is when the car shifts from 3rd to 4th I notice a loss of power, each shift up until this feels smooth. I also have a video of this but not sure how evident it is in video. There is also a new issue that has risen, if I am at a dead stop and put my foot to the the floor, the car seems sluggish for the first 20mph. It revs up to about 2k rpm and holds it for a second before the power really kicks in. On top of all this there is also a whining noise I notice in lower gears at full throttle, sounds very similar to a supercharger. I have been trying to resolve the issues with this car since the day I bought it. If anyone has had a similar experience or has heard of these issues please let me know. Can PM videos if anyone is interested. Thank you
Out Of Control!!
Joined: Apr 2019
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From: Silicon Valley
W212 MY'14 M276-3.5NA @75kMi
standard fare...
Hello, I have a 2017 CLS63S I have had for close to 2 years now. The car is still covered under CPO warranty, unfortunately I have had no luck with Mercedes diagnosing the problems I am having with the car. On two occasions now while driving, the area of my gauge cluster where it shows my gear has gone out and I can not accelerate. The engine revs but the car does not put the power down. I have this on video both times. Another issue I am having is when the car shifts from 3rd to 4th I notice a loss of power, each shift up until this feels smooth. I also have a video of this but not sure how evident it is in video. There is also a new issue that has risen, if I am at a dead stop and put my foot to the the floor, the car seems sluggish for the first 20mph. It revs up to about 2k rpm and holds it for a second before the power really kicks in. On top of all this there is also a whining noise I notice in lower gears at full throttle, sounds very similar to a supercharger. I have been trying to resolve the issues with this car since the day I bought it. If anyone has had a similar experience or has heard of these issues please let me know.
Can PM videos if anyone is interested. Thank you
Can PM videos if anyone is interested. Thank you
Where you should draw the line is with LIMP MODE: this can lead to fatality in rush hour traffic.
Get this worked on by your local MB experts:
- Start with a chassis comprehensive scan
- Focus on most unstable CAN Modules
- Deal with marginal voltage issues
When the warranty expires is when work stops regardless of known pre-existing defect.
Then you can experiment with your spongy throttle out of warranty.
Last edited by CaliBenzDriver; Mar 19, 2026 at 08:51 PM.
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2018 CLS63s 4Matic+
Could this code have something to do with it?
I read your documented feedback. A lot of these issues are standard built-in features, in particular "below 2,000.Rpm...".
Where you should draw the line is with LIMP MODE: this can lead to fatality in rush hour traffic.
Get this worked on by your local MB experts:
When the warranty expires is when work stops regardless of known pre-existing defect.
Then you can experiment with your spongy throttle out of warranty.
Where you should draw the line is with LIMP MODE: this can lead to fatality in rush hour traffic.
Get this worked on by your local MB experts:
- Start with a chassis comprehensive scan
- Focus on most unstable CAN Modules
- Deal with marginal voltage issues
When the warranty expires is when work stops regardless of known pre-existing defect.
Then you can experiment with your spongy throttle out of warranty.
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Newbie
Joined: Mar 2026
Posts: 3
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2018 CLS63s 4Matic+
Was the issue always there?
Hello, I have a 2017 CLS63S I have had for close to 2 years now. The car is still covered under CPO warranty, unfortunately I have had no luck with Mercedes diagnosing the problems I am having with the car. On two occasions now while driving, the area of my gauge cluster where it shows my gear has gone out and I can not accelerate. The engine revs but the car does not put the power down. I have this on video both times. Another issue I am having is when the car shifts from 3rd to 4th I notice a loss of power, each shift up until this feels smooth. I also have a video of this but not sure how evident it is in video. There is also a new issue that has risen, if I am at a dead stop and put my foot to the the floor, the car seems sluggish for the first 20mph. It revs up to about 2k rpm and holds it for a second before the power really kicks in. On top of all this there is also a whining noise I notice in lower gears at full throttle, sounds very similar to a supercharger. I have been trying to resolve the issues with this car since the day I bought it. If anyone has had a similar experience or has heard of these issues please let me know. Can PM videos if anyone is interested. Thank you
nother follow up from me, did this start happening at random for you or was it always there? Mine consistently happens under light load and right at 2k RPM
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