slight jolt when going into reverse gear on cold start?
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2017 C63s converitble
slight jolt when going into reverse gear on cold start?
I posted a few weeks ago about the car blipping the throttle a bit when going into reverse gear, but now im noticing that the car has a slight jolt when switching to reverse on a cold start, is that normal? its not entirely smooth
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Did you allow the vehicle to idle down a little (like after 15 seconds or so of starting) before reversing?
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Assuming you let the revs settle to idle first after a cold start, this can be caused if some of the adaptations haven't completed in the transmission. There are adaptations for changing from P to D, P to R and all the reverse. I had this issue early on in my ownership and it seemed to have been caused by me not manually putting the transmission in P when parking and instead just turning off the engine and letting the transmission go to P on its own. I stopped doing that and it went away. It can also occur if I forget to put the car in Comfort mode before going to P and turning off the engine. The higher idle in Sport+ seems to have an effect on this if it's parked that way. I came across an IL document from Mercedes outlining a procedure for how to train the transmission specifically for this case, but I can't find it anymore. It involved a series of going from P to D and P to R and repeating it several times. I didn't follow it as it went away on its own as soon as I started putting the transmission in P before shutting off the engine and ensuring that I was in Comfort mode, so it seems to correct the adaptations on its own when following the proper shutdown sequence.
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Assuming you let the revs settle to idle first after a cold start, this can be caused if some of the adaptations haven't completed in the transmission. There are adaptations for changing from P to D, P to R and all the reverse. I had this issue early on in my ownership and it seemed to have been caused by me not manually putting the transmission in P when parking and instead just turning off the engine and letting the transmission go to P on its own. I stopped doing that and it went away. It can also occur if I forget to put the car in Comfort mode before going to P and turning off the engine. The higher idle in Sport+ seems to have an effect on this if it's parked that way. I came across an IL document from Mercedes outlining a procedure for how to train the transmission specifically for this case, but I can't find it anymore. It involved a series of going from P to D and P to R and repeating it several times. I didn't follow it as it went away on its own as soon as I started putting the transmission in P before shutting off the engine and ensuring that I was in Comfort mode, so it seems to correct the adaptations on its own when following the proper shutdown sequence.
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Don't worry about the slight jolt, wait until you get the C63 on one of those bizarre steep angle driveways and your E-diff causes a wheel to spin in the air then the car rolls back, stalls and shuts off for a bit. That'll give you the ******* 😂
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That sounds more like a malfunction. The point of the e-diff locking up is to send power to the other wheel that has traction. I do encounter driveways like that where one wheel goes airborne. The diff locks and the other wheel moves the car up the driveway. There's a momentary hesitation as the diff realizes one wheel has zero traction, but then it immediately goes again. I guess there could be a moment that it rolls back before it realizes that it needs to lock, but FWIW, the FL does lock faster than the PFL as the 9-stage TC is better and faster at detecting wheel slip, so experience could be different between the FL and PFL.
Last edited by superswiss; Apr 15, 2025 at 08:53 PM.
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That sounds more like a malfunction. The point of the e-diff locking up is to send power to the other wheel that has traction. I do encounter driveways like that where one wheel goes airborne. The diff locks and the other wheel moves the car up the driveway. There's a momentary hesitation as the diff realizes one wheel has zero traction, but then it immediately goes again. I guess there could be a moment that it rolls back before it realizes that it needs to lock, but FWIW, the FL does lock faster than the PFL as the 9-stage TC is better and faster at detecting wheel slip, so experience could be different between the FL and PFL.
I swapped out the e-diff years ago and never had that happen again on mine.
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Out Of Control!!
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2019 C63CS
Last edited by superswiss; Apr 16, 2025 at 01:11 AM.
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2017 C63s converitble
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That's happened to me a few times over the last few years like @W205C43PFL said it was during a hasty reverse after a cold start and it went TUNK.
Don't worry about the slight jolt, wait until you get the C63 on one of those bizarre steep angle driveways and your E-diff causes a wheel to spin in the air then the car rolls back, stalls and shuts off for a bit. That'll give you the ******* 😂
Don't worry about the slight jolt, wait until you get the C63 on one of those bizarre steep angle driveways and your E-diff causes a wheel to spin in the air then the car rolls back, stalls and shuts off for a bit. That'll give you the ******* 😂
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As eluded, I suppose I can see how that can happen. As one of the wheels goes airborne, the diff is open and the car could start rolling backwards on the other wheel while the diff is realizing that one wheel has lost traction, but may not catch it in time to safely lock and instead protects itself seeing that the other wheel is turning backwards. I believe both of you have a PFL, so I do wonder if it's improved in the FL. As said, I've encountered situations with one wheel going airborne. Also I occasionally park on the side of the road on a hill with one wheel in sand and the other on the pavement and facing uphill. When I try to get out, the wheel in the sand starts spinning, but the car doesn't roll backwards and a moment later it transfers torque to the wheel on the pavement and drives out of the sand. First time I parked there with this car I didn't even think about it as I had an Audi RS5 before which pulled out of there with no fuss obviously.
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Just start driving immediately after idling down, cold starting and then leaving it to heat up is bad for the engine which you know that already.
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2017 C63s converitble
i mean, i wait at least 15-20 seconds before putting it into R
regarding @superswiss post earlier, the adaptations...thats an interesting take. I always put my car in P before turning it off, but I didnt consider that turning it off in S+ would have a difference vs C
regarding @superswiss post earlier, the adaptations...thats an interesting take. I always put my car in P before turning it off, but I didnt consider that turning it off in S+ would have a difference vs C
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2017 C63s converitble
update: let the car idle down and put it into reverse, the jolt was non-existant. will keep testing
will also try putting the car in C before turning it off
will also try putting the car in C before turning it off
Last edited by carzaddict; Apr 17, 2025 at 09:34 AM.
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Nice work man. Now don't forget it's good practice to reset the transmission every few months. And when it's due for a transmission service you'll find it better to drive once it's done 👍
