new C300 with Engine noise
Super Member
Joined: Dec 2015
Posts: 505
Likes: 58
From: Gold Coast, Oz.
C300 S205 AMG, GLA 45 AMG
This glide function freaked me out at first til I realized what was going on. It still is a better drive than the gla. They had me drive one of those and it had the DCT and when u first take off it feels like your driving a manual transmission with the lag til the second clutch engages
Weird, our GLA 250 AMG has bugger all delay between shifts, its smooth and intuitve.. runs very strong with a tune too.
I fitted a GFB DV+ which does improve the transmission feel further... as the boost is held up slightly between shifts so the reintroduction of power is from a higher level and hence smoother..
Member
Joined: May 2016
Posts: 77
Likes: 9
From: South Dakota
2015 C300 Sport 4Matic, 2014 C300 Sport 4Matic
Just got my car back from getting the engine noise taken care of. So much quieter. Still annoyed they couldn't find the rattle in my driver door/dash area. It wouldn't replicate for them or me but literally the moment I picked it up it was back. They pulled the door panel and refitted no fix.
Member
Joined: May 2013
Posts: 174
Likes: 14
From: Main Line, LBK, LBI, etc
19E450A, 16C450W4, 16RRS SC Dynamic, etc
Hi guys, I didn't know about this issue before this thread, but after reading it, I went out to my car (2015 C300 build 03/15) and a faintly heard it, but only for the first maybe 10-20 seconds of a start (warms up pretty quickly in the warm weather) -- hence why I never noticed it before. After, I brought my car to the dealer, mentioned this, and turns out I need to have my pistons replaced, just like virtually everybody else in this thread. Mine's a lease which will go back just at the end of the car's new car warranty, so I'm not sure how much of a difference for me it would have made, but for the next owner it could have made a big difference, and maybe I'd end up on the side of the highway stranded, so best to get it done. Thanks to all for making me aware of this issue!
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
Trying to get a fix on whether my 2015 C300 (4/2015 build date) has the wrist pin issue or something else. What I hear from my engine (cold start, 2,000-1,000 RPM) doesn't quite sound like what I hear in earlier posted sound clips on this thread.
Recorded this today
; similar to what anyone else with the wrist pin issue heard from their engine? Thanks
Recorded this today
; similar to what anyone else with the wrist pin issue heard from their engine? Thanks
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,193
Likes: 302
From: Oklahoma
2016 C300 4Matic traded in for a 2022 E450 Coupe
Trying to get a fix on whether my 2015 C300 (4/2015 build date) has the wrist pin issue or something else. What I hear from my engine (cold start, 2,000-1,000 RPM) doesn't quite sound like what I hear in earlier posted sound clips on this thread.
Recorded this today; similar to what anyone else with the wrist pin issue heard from their engine? Thanks
https://youtu.be/SzD7P5TXiGk
Recorded this today
; similar to what anyone else with the wrist pin issue heard from their engine? Thankshttps://youtu.be/SzD7P5TXiGk
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,822
Likes: 33
From: Whitefield, NH
2015 C300 Sport: Palladium, Premium, Multimedia, Leather, BLIS
Trying to get a fix on whether my 2015 C300 (4/2015 build date) has the wrist pin issue or something else. What I hear from my engine (cold start, 2,000-1,000 RPM) doesn't quite sound like what I hear in earlier posted sound clips on this thread.
Recorded this today; similar to what anyone else with the wrist pin issue heard from their engine? Thanks
https://youtu.be/SzD7P5TXiGk
Recorded this today
; similar to what anyone else with the wrist pin issue heard from their engine? Thankshttps://youtu.be/SzD7P5TXiGk
Junior Member
Joined: Apr 2014
Posts: 20
Likes: 0
05 C230, 15 C300
I have a 2015 C300. It was made 1/2015 and it has the same sound when I start it up. Let us know what they say when you take it in. To be honest I'm hoping it is nothing because I don't want the dealer opening the engine. I already had a drive shaft replaced for a grinding sound in reverse. What I don't understand is that our engines are from Germany and I don't think they were all new. I thought they were using them in Europe for over a year.
MB World Stories
The Best of Mercedes & AMG
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)
Verdad Gallardo
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
In she goes
Will do @C230WAK. It's scheduled to go in tomorrow. An alternative suggestion for the cause, that I heard today, is tappets needing adjustment. That would be a relief, but I don't see much mention of those on related threads so I'm expecting the worst (wrist pin issue). Thanks for commenting. Watch for follow-up.
@StanNH, thanks for replying, yeah I was already planning to take my car in, but I like to get as much advance intel as I can gather, and there's a ton of great experience on this forum.
@StanNH, thanks for replying, yeah I was already planning to take my car in, but I like to get as much advance intel as I can gather, and there's a ton of great experience on this forum.
MBWorld Fanatic!
Joined: Sep 2014
Posts: 1,822
Likes: 33
From: Whitefield, NH
2015 C300 Sport: Palladium, Premium, Multimedia, Leather, BLIS
Will do @C230WAK. It's scheduled to go in tomorrow. An alternative suggestion for the cause, that I heard today, is tappets needing adjustment. That would be a relief, but I don't see much mention of those on related threads so I'm expecting the worst (wrist pin issue). Thanks for commenting. Watch for follow-up.
@StanNH, thanks for replying, yeah I was already planning to take my car in, but I like to get as much advance intel as I can gather, and there's a ton of great experience on this forum.
@StanNH, thanks for replying, yeah I was already planning to take my car in, but I like to get as much advance intel as I can gather, and there's a ton of great experience on this forum.
Super Member
Joined: Apr 2010
Posts: 789
Likes: 47
From: Eastern Massachusetts
2021 E450, 2020 C43, 2015 C300, 2007 C280
German design problem, not an American assembly problem
The problem with all of this is that MB has never indicated just how widespread the issue is. The TSB covers a large range of vehicles, but no one knows the numbers of cars that have had, or may have, the problem. The latest CR reliability survey does not indicate an unusual number of problems reported for 2015 engines, so it may not be as common as feared. ....
I have also read that early production models of the C-Class had engines and transmissions made in Germany. At some point unknown to me, the Alabama factory started using engines and transmissions made in a joint Mercedes-Nissan-Renault plant in Tennessee. My C300 was delivered in early 02/15, with a build date of 12/23/14. I believe (but am not certain) it has a German engine. It had the wrist pin problem. It was rebuilt in 11/15 and has been smooth and trouble-free since.
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
Engine tear-down it is
Confirmed as the wrist pin problem at the dealership. 
They're supposed to start the engine tear-down today, parts due in tomorrow. There was even mention of the possibility of having the job done by the weekend, but it seems to me like they should keep it at least an extra day to put some miles on it and confirm that there are no leaks or other side-issues?
I also recall a few mentions further back in this thread about the technician putting 50-100 miles on the car post-repair to ensure all is well. Think I should insist on that if it's not already in the plan?
(On the plus side, they gave me an E-class as a loaner.
)
They're supposed to start the engine tear-down today, parts due in tomorrow. There was even mention of the possibility of having the job done by the weekend, but it seems to me like they should keep it at least an extra day to put some miles on it and confirm that there are no leaks or other side-issues?I also recall a few mentions further back in this thread about the technician putting 50-100 miles on the car post-repair to ensure all is well. Think I should insist on that if it's not already in the plan?
(On the plus side, they gave me an E-class as a loaner.
)
Member
Joined: Apr 2010
Posts: 100
Likes: 3
From: SYDNEY, AUSTRALIA
C350e with Comand, Vision Package and seat package, 2017 Mini Cooper S 7
I've just ordered a new C350e and the delivery has been put back 3 months. My dealer says it's because a "new" engine is being fitted.
Maybe MB has realised it is a big problem and are fixing it.
My dealer couldn't give more details.
In another part of this Forum I was advised that it could be due to this "Wrist Pin" problem.
Maybe MB has realised it is a big problem and are fixing it.
My dealer couldn't give more details.
In another part of this Forum I was advised that it could be due to this "Wrist Pin" problem.
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
Engine rebalance during wrist pin repair?
My biggest question at this point regards engine balance. If the weight of the new components is different than the old -- and that seems likely to me since the replacement wrist pins will be a slightly different size than the old ones, for starters -- shouldn't the technicians be throwing the cam shaft onto a balancing machine to make sure the resulting rotating weight difference is neutralized? I asked about that, and it's my impression that engine balancing is not part of the MB guidelines for this particular repair. Should it be?
Junior Member
Joined: Nov 2016
Posts: 26
Likes: 0
2015 C300 4MATIC
bringing this back from the dead since i just bought a used c300 a month ago...
i hear a faint rattling or knocking noise rarely at idle or low rpm's. honestly, i probably wouldn't have even noticed it if i hadn't read this entire thread and listen for it constantly.
took into the dealership and they told me that my engine does not have the wrist pin issues. they didnt take apart the engine, they just simply listened for it. i was told the head technician, who has seen this issue before and is knowledgeable was who took a look at my car.
should i be satisfied with this result or should i push them to take a deeper look?
i hear a faint rattling or knocking noise rarely at idle or low rpm's. honestly, i probably wouldn't have even noticed it if i hadn't read this entire thread and listen for it constantly.
took into the dealership and they told me that my engine does not have the wrist pin issues. they didnt take apart the engine, they just simply listened for it. i was told the head technician, who has seen this issue before and is knowledgeable was who took a look at my car.
should i be satisfied with this result or should i push them to take a deeper look?
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
What's your build date? Anything earlier than 5/2015 is apparently suspect for the wrist pin thing. BTW, when you say "rarely at idle or low rpm's" do you mean the sound occurs occasionally, or do you mean it occurs most often at high rpms and less often at low rpms/idle? Also, is the engine cold or warm when you hear it, or makes no difference?
The techs at any MB dealership service garage should be very familiar with this issue by now, and I see no reason to doubt what yours says, but if your engine build is pre-5/2015 and you hear the rattle when the engine is cold somewhere between 1,000 and 2,000 RPM at idle and low speed, you may want to get a second opinion if another dealer is within range.
Or, of course, path of least resistance is to ask your tech to identify what IS causing the noise you are hearing, if you can get it to occur with him in the car
The techs at any MB dealership service garage should be very familiar with this issue by now, and I see no reason to doubt what yours says, but if your engine build is pre-5/2015 and you hear the rattle when the engine is cold somewhere between 1,000 and 2,000 RPM at idle and low speed, you may want to get a second opinion if another dealer is within range.
Or, of course, path of least resistance is to ask your tech to identify what IS causing the noise you are hearing, if you can get it to occur with him in the car
Senior Member
Joined: Nov 2014
Posts: 457
Likes: 16
From: Columbus, GA
'25 MB GLE 450, w/airmatic
bringing this back from the dead since i just bought a used c300 a month ago...
i hear a faint rattling or knocking noise rarely at idle or low rpm's. honestly, i probably wouldn't have even noticed it if i hadn't read this entire thread and listen for it constantly.
took into the dealership and they told me that my engine does not have the wrist pin issues. they didnt take apart the engine, they just simply listened for it. i was told the head technician, who has seen this issue before and is knowledgeable was who took a look at my car.
should i be satisfied with this result or should i push them to take a deeper look?
i hear a faint rattling or knocking noise rarely at idle or low rpm's. honestly, i probably wouldn't have even noticed it if i hadn't read this entire thread and listen for it constantly.
took into the dealership and they told me that my engine does not have the wrist pin issues. they didnt take apart the engine, they just simply listened for it. i was told the head technician, who has seen this issue before and is knowledgeable was who took a look at my car.
should i be satisfied with this result or should i push them to take a deeper look?
Member
Joined: Sep 2015
Posts: 109
Likes: 21
From: Chicago, IL
2015 C300 sport
. Tech put 150 miles on it (with my permission of course) to make sure all was well. Lonnnnng list of parts replaced. End result: the rattle is gone, and the engine sounds a bit gruffer than it did, which doesn't bother me actually, and performance seems a bit better, both in terms of acceleration and possibly even a tiny bit in mpg. (I could be imagining both of these -- i didn't benchmark mpg before the operation unfortunately, and the transmission control unit may simply finally be realizing that I prefer not to dawdle away from a light regardless of what driving mode I'm in and adjusting accordingly.) Regardless, happy to have caught the problem early thanks to earlier posts in this and similar threads.
