C300 2016 pushes back (jerks) when accelerating?
05-15-2017, 07:27 PM
#1
Junior Member
Thread Starter
C300 2016 pushes back (jerks) when accelerating?
Hey guys, just got my new c300 2016 last August and I've noticed something pretty annoying. It doesn't happen constantly but when I try to speed up at times my car pushes back and then starts speeding, very annoying. Sometimes even the RPM goes all the way until 3 but the car isn't speeding up yet. People told me this is completely normal. What do you guys think? My friends Lexus rx350 does the same so I thought maybe it's pretty normal lol
05-16-2017, 07:20 AM
#2
Senior Member
Are you in comfort mode when this happens? It shouldn't really happen in sport or sport+ but yes, in eco or comfort mode there is definitely some lag between shifting and the turbo spooling up. This is fairly intentional thought. If you feel like the transmission is just slipping then that's a different story.
05-16-2017, 02:47 PM
#3
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BMW e89 Z4 sDrive 35i & MB S205 C200 AMG Premium Plus
Crap gear logic programming, I have similar issues. Even the latest software hasn't fixed it. Sick of going to dealership now, they can just have it back at end of term, I'll write off a huge chunk of cash sadly but I've learned never to go MB again.
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Paul Bohmlander (08-06-2020)
05-16-2017, 10:25 PM
#5
Member
I had this happen a few times, always in C. I switched to full-time S+, and haven't had the problem so far. Is that the ideal answer to what seems like a shift point miscalc? probably not. I just figured such a rare situation would be hard for the MB techs to replicate, let alone fix. But maybe it's a known problem with an easy solution.
Doing a manual reset of the tranny adaptive system might help, btw. It did for me (for a while) after one of those early C mode "jerk" episodes. I followed this: http://www.mercedesmedic.com/reset-m...-instructions/
If you take it in and get a fix, it would be great to hear. Although, I gotta say, I am less and less likely to ever go back to Comfort regardless. Even in slow city driving, S+ rocks.
Doing a manual reset of the tranny adaptive system might help, btw. It did for me (for a while) after one of those early C mode "jerk" episodes. I followed this: http://www.mercedesmedic.com/reset-m...-instructions/
If you take it in and get a fix, it would be great to hear. Although, I gotta say, I am less and less likely to ever go back to Comfort regardless. Even in slow city driving, S+ rocks.
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05-17-2017, 07:34 PM
#7
Member
I recall another thread that arrived at the conclusion that full-time S vs C lowered mpg only by 1 or so, and i could argue that fuel efficiency didn't top my list when I bought this rig (probably like many other MB drivers, let's be real) or I would have been in a prius dealership.
But it's actually a moot point in this thread because I hit the jerking problem today on S+.
Not fun to be on a four-lane city street maneuvering in a low gear and feeling like the engine's about to stall. I'm going to use the TAS reset as a temporary fix and take it in soon.
But it's actually a moot point in this thread because I hit the jerking problem today on S+.
Not fun to be on a four-lane city street maneuvering in a low gear and feeling like the engine's about to stall. I'm going to use the TAS reset as a temporary fix and take it in soon.
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Paul Bohmlander (08-06-2020)
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05-17-2017, 11:07 PM
#8
I recall another thread that arrived at the conclusion that full-time S vs C lowered mpg only by 1 or so, and i could argue that fuel efficiency didn't top my list when I bought this rig (probably like many other MB drivers, let's be real) or I would have been in a prius dealership.
But it's actually a moot point in this thread because I hit the jerking problem today on S+. Not fun to be on a four-lane city street maneuvering in a low gear and feeling like the engine's about to stall. I'm going to use the TAS reset as a temporary fix and take it in soon.
But it's actually a moot point in this thread because I hit the jerking problem today on S+.
Not fun to be on a four-lane city street maneuvering in a low gear and feeling like the engine's about to stall. I'm going to use the TAS reset as a temporary fix and take it in soon.
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benzw205 (04-10-2023)
05-18-2017, 11:48 AM
#9
Junior Member
Thread Starter
I had this happen a few times, always in C. I switched to full-time S+, and haven't had the problem so far. Is that the ideal answer to what seems like a shift point miscalc? probably not. I just figured such a rare situation would be hard for the MB techs to replicate, let alone fix. But maybe it's a known problem with an easy solution.
Doing a manual reset of the tranny adaptive system might help, btw. It did for me (for a while) after one of those early C mode "jerk" episodes. I followed this: http://www.mercedesmedic.com/reset-m...-instructions/
If you take it in and get a fix, it would be great to hear. Although, I gotta say, I am less and less likely to ever go back to Comfort regardless. Even in slow city driving, S+ rocks.
Doing a manual reset of the tranny adaptive system might help, btw. It did for me (for a while) after one of those early C mode "jerk" episodes. I followed this: http://www.mercedesmedic.com/reset-m...-instructions/
If you take it in and get a fix, it would be great to hear. Although, I gotta say, I am less and less likely to ever go back to Comfort regardless. Even in slow city driving, S+ rocks.
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Paul Bohmlander (08-06-2020)
05-21-2017, 02:27 PM
#11
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Thread Starter
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Paul Bohmlander (08-06-2020)
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Paul Bohmlander (08-06-2020)
05-23-2017, 04:06 AM
#15
Gents,
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
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benzw205 (04-10-2023)
05-23-2017, 10:30 AM
#16
Gents,
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
Off topic, when I start my car in the morning the engine seem loud like a diesel then after maybe 3mins it kinda normalizes but still kinda noisy for a 4cyl. Not sure if this is a c300 issue. My precious car was 2015 accord v6 and that car is like a ninja quiet. Anyone knows about this noise? It's a 2017 8882 Miles. This car is a dealership loaner before and I bought it at 7850miles.
05-23-2017, 11:33 AM
#17
Im new to MB product but I asked my dad and he doesn't notice this on his E350 or GL450. I never had this in my previous japanese vehicles. It's almost like the car chokes then goes.
Off topic, when I start my car in the morning the engine seem loud like a diesel then after maybe 3mins it kinda normalizes but still kinda noisy for a 4cyl. Not sure if this is a c300 issue. My precious car was 2015 accord v6 and that car is like a ninja quiet. Anyone knows about this noise? It's a 2017 8882 Miles. This car is a dealership loaner before and I bought it at 7850miles.
Off topic, when I start my car in the morning the engine seem loud like a diesel then after maybe 3mins it kinda normalizes but still kinda noisy for a 4cyl. Not sure if this is a c300 issue. My precious car was 2015 accord v6 and that car is like a ninja quiet. Anyone knows about this noise? It's a 2017 8882 Miles. This car is a dealership loaner before and I bought it at 7850miles.
Somewhere on this forum is a method described that allows you to reset the gearbox. Maybe that helps.
05-23-2017, 09:35 PM
#18
Junior Member
Thread Starter
Gents,
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
When driving in highest gear and you are pushing the pedal in deep {no kick down yet) the gearbox might want to go down one gear to give the requested acelleration. Pushing it deeper (kick down) tequires the gearbox to shift down another 2 (or maybe even 3 gears) to give you the maximum torque you request. This second gear shift might occur when the 1st wasn't completely finished and therefore this might happen once and a while. It mostly happens in Eco or Comfort. In Sport and Sport+ this is less likely to happen. If you hit the pedal to the bottom in one go this should not happen. The self learning behavior of the gear box is looking at your historical drive behavior and anticipates on that. That might be a part of the issue too.
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Paul Bohmlander (08-06-2020)
05-23-2017, 10:21 PM
#19
Member
My experiences with the problem have been in low gears, either pulling from a stop/near-stop or accelerating from a slow speed. It's occurred in both Comfort and Sport+. I have heard this described as gear slipping, and it certainly reminds me of a handful of stick-shift situations I experienced where there really weren't enough RPMs to shift up, but someone tried anyway.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
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Paul Bohmlander (08-06-2020)
05-23-2017, 10:32 PM
#20
Junior Member
Thread Starter
My experiences with the problem have been in low gears, either pulling from a stop/near-stop or accelerating from a slow speed. It's occurred in both Comfort and Sport+. I have heard this described as gear slipping, and it certainly reminds me of a handful of stick-shift situations I experienced where there really weren't enough RPMs to shift up, but someone tried anyway.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
Hopefully they give me the same loaner, actually quite excited about that 😂. Just hope they don't say anything about my muffler delete 😕
05-23-2017, 11:33 PM
#21
My experiences with the problem have been in low gears, either pulling from a stop/near-stop or accelerating from a slow speed. It's occurred in both Comfort and Sport+. I have heard this described as gear slipping, and it certainly reminds me of a handful of stick-shift situations I experienced where there really weren't enough RPMs to shift up, but someone tried anyway.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
I dropped my car off tonight. They were kind enough to provide a '17 C300 loaner. And it feels (and sounds, and behaves) like a completely different car; just in Comfort, the acceleration is instant and rather awe-inspiring compared to my '15 at its Sport+ best, and the sound is a satisfying growl. I am starting to feel those "first year of a completely new model" blues... and wondering if that MB upgrade program they were flogging on big banners in the service area might not be worth serious consideration.
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Paul Bohmlander (08-06-2020)
05-23-2017, 11:37 PM
#22
05-26-2017, 09:48 PM
#23
Member
Picked my car up today. The diagnosis was a failing crankshaft position sensor. Tech was able to replicate the problem. Replaced the sensor and kept overnight for testing.
So far so good, feels like a whole new engine (so no, @GerritKw, seems like I don't need to trade up quite yet ;-)). Had a few typical trigger point situations in sludgy Chicago traffic on the way home, and the transmission handled perfectly.
I asked why the problem didn't trigger the check engine light, so I could have picked up the fault code on a scanner, but apparently the problem was only a pending code when I brought the car in. Glad I brought it in early.
Ahmad, I will be interested to hear if your issue/fix ends up being similar.
So far so good, feels like a whole new engine (so no, @GerritKw, seems like I don't need to trade up quite yet ;-)). Had a few typical trigger point situations in sludgy Chicago traffic on the way home, and the transmission handled perfectly.
I asked why the problem didn't trigger the check engine light, so I could have picked up the fault code on a scanner, but apparently the problem was only a pending code when I brought the car in. Glad I brought it in early.
Ahmad, I will be interested to hear if your issue/fix ends up being similar.
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Paul Bohmlander (08-06-2020)
06-06-2017, 03:48 PM
#24
Junior Member
Thread Starter
Picked my car up today. The diagnosis was a failing crankshaft position sensor. Tech was able to replicate the problem. Replaced the sensor and kept overnight for testing.
So far so good, feels like a whole new engine (so no, @GerritKw, seems like I don't need to trade up quite yet ;-)). Had a few typical trigger point situations in sludgy Chicago traffic on the way home, and the transmission handled perfectly.
I asked why the problem didn't trigger the check engine light, so I could have picked up the fault code on a scanner, but apparently the problem was only a pending code when I brought the car in. Glad I brought it in early.
Ahmad, I will be interested to hear if your issue/fix ends up being similar.
So far so good, feels like a whole new engine (so no, @GerritKw, seems like I don't need to trade up quite yet ;-)). Had a few typical trigger point situations in sludgy Chicago traffic on the way home, and the transmission handled perfectly.
I asked why the problem didn't trigger the check engine light, so I could have picked up the fault code on a scanner, but apparently the problem was only a pending code when I brought the car in. Glad I brought it in early.
Ahmad, I will be interested to hear if your issue/fix ends up being similar.
The following users liked this post:
Paul Bohmlander (08-06-2020)
02-15-2019, 03:02 PM
#25
Disel like noise on cold start up
Im new to MB product but I asked my dad and he doesn't notice this on his E350 or GL450. I never had this in my previous japanese vehicles. It's almost like the car chokes then goes.
Off topic, when I start my car in the morning the engine seem loud like a diesel then after maybe 3mins it kinda normalizes but still kinda noisy for a 4cyl. Not sure if this is a c300 issue. My precious car was 2015 accord v6 and that car is like a ninja quiet. Anyone knows about this noise? It's a 2017 8882 Miles. This car is a dealership loaner before and I bought it at 7850miles.
Off topic, when I start my car in the morning the engine seem loud like a diesel then after maybe 3mins it kinda normalizes but still kinda noisy for a 4cyl. Not sure if this is a c300 issue. My precious car was 2015 accord v6 and that car is like a ninja quiet. Anyone knows about this noise? It's a 2017 8882 Miles. This car is a dealership loaner before and I bought it at 7850miles.
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Paul Bohmlander (08-06-2020)
