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Mercedes Benz C-class W205 Problems Malfunction What Is Your Experience ?

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C Class (W205) C 180 BlueTec,C 200 BlueTec,C 220 BlueTec,C 220 BlueTec BlueEfficiency,C 250 BlueTec,C 300 BlueTec Hybridplus,C 180,C 180 BlueEfficiency,C 200,C 250,C 300,C 400 Plug-in Hybrid,C 400
View Poll Results: Any problems with your new C-class W205 Mercedes Benz ?
Yes
237
62.53%
No
142
37.47%
Voters: 379. You may not vote on this poll

Old 05-21-2015, 06:22 PM
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Mercedes Benz C-class W205 Problems Malfunction What Is Your Experience ?

Old 12-26-2014, 04:21 PM
  #151  
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Originally Posted by StanNH View Post
Sometimes a glaze can form and cause the squealing. Try some very hard braking to see if that will stop the noise.


I would also recommend heavy braking while in reverse, this helps too.
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Old 12-26-2014, 07:46 PM
  #152  
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The Stoptech website covers modern brake theory very well.

Here is the bed in procedure but if you go back to Technical Information all of their white papers are excellent.

http://www.stoptech.com/technical-su...and-procedures
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Old 12-26-2014, 09:41 PM
  #153  
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Knocking on turns...

I have a knocking noise that occurs when turning. Anyone else have this? I've only noticed at low speeds, and only at a certain degree of wheel turn occasionally. The tech at the dealer was able to replicate the issue, and I'm leaving the car there next week to fix. Disappointing on a brand new MB.

I also notice some scratches on the wood paneling in the car, that the dealer said they'd replace. On delivery, they seemed like smudges, but turned out to be scratches.

It's definitely disappointing to have these types of issues on a new car, but so far, the dealer service has been great; at least in terms of what they say they will do, as nothing has been done yet. Honestly, I hope the actual service works out the same, as I would love to have a working relationship with a dealer close to me; so far the signs are positive, and they come across as honest hard working folks.

I will update again after the actual service is completed.
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Old 12-26-2014, 09:45 PM
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Originally Posted by gnus View Post
I have a knocking noise that occurs when turning. Anyone else have this? I've only noticed at low speeds, and only at a certain degree of wheel turn occasionally. The tech at the dealer was able to replicate the issue, and I'm leaving the car there next week to fix. Disappointing on a brand new MB.

I also notice some scratches on the wood paneling in the car, that the dealer said they'd replace. On delivery, they seemed like smudges, but turned out to be scratches.

It's definitely disappointing to have these types of issues on a new car, but so far, the dealer service has been great; at least in terms of what they say they will do, as nothing has been done yet. Honestly, I hope the actual service works out the same, as I would love to have a working relationship with a dealer close to me; so far the signs are positive, and they come across as honest hard working folks.

I will update again after the actual service is completed.
Interesting you posted this knocking issue. I got my car Monday and just noticed this exact same thing tonight for the first time. Please post an update once your dealer tells you what the issue is.
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Old 12-26-2014, 09:50 PM
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Originally Posted by richardamp View Post
Interesting you posted this knocking issue. I got my car Monday and just noticed this exact same thing tonight for the first time. Please post an update once your dealer tells you what the issue is.
Slow turns at almost 90 degrees for you? It's a dulled "knock knock knock" only at certain degree turns; also inconsistent. I've usually noticed it turning into my driveway. They initially thought they knew what the issue was, had to do with fluid transfer on 4MATICS, but the soft fix didn't seem to work this time. Thus bringing it in again next week. I'm just glad they were able to replicate the issue, as I was previously.

Same scenario on the noise for you?
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Old 12-26-2014, 10:05 PM
  #156  
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Originally Posted by gnus View Post
Slow turns at almost 90 degrees for you? It's a dulled "knock knock knock" only at certain degree turns; also inconsistent. I've usually noticed it turning into my driveway. They initially thought they knew what the issue was, had to do with fluid transfer on 4MATICS, but the soft fix didn't seem to work this time. Thus bringing it in again next week. I'm just glad they were able to replicate the issue, as I was previously.

Same scenario on the noise for you?
Yes similar, when making basic turns I hear a knock or two sometimes. It doesn't happen every time and is subtle, but still very frustrating.
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Old 12-27-2014, 06:35 AM
  #157  
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You don't mention what location the knock seems to come from. Is it effected by fuel level in the tank? With W203 & W204 a few critical users hear a distant knocking that was traced to the dual fuel level sensor units under the back seat. 203 & 204 had the castor bush issue & sometimes soft rear tranny mount that caused knocks in certain conditions. It can be things as simple as exhaust routing & fitment.

With W205 having seen a complete suspension redesign even with steel underpinnings we don't yet know of potential minor gremlins.
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Old 12-27-2014, 10:08 AM
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Originally Posted by Glyn M Ruck View Post
You don't mention what location the knock seems to come from. Is it effected by fuel level in the tank? With W203 & W204 a few critical users hear a distant knocking that was traced to the dual fuel level sensor units under the back seat. 203 & 204 had the castor bush issue & sometimes soft rear tranny mount that caused knocks in certain conditions. It can be things as simple as exhaust routing & fitment.

With W205 having seen a complete suspension redesign even with steel underpinnings we don't yet know of potential minor gremlins.
In the front for me. I think I could feel the knocking / clicking in the steering wheel itself.

I took a brief drive this morning and didn't notice anything this time.
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Old 12-27-2014, 10:41 AM
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Originally Posted by richardamp View Post
In the front for me. I think I could feel the knocking / clicking in the steering wheel itself.

I took a brief drive this morning and didn't notice anything this time.
Hmm! that could be many things including the rack mounting bushings. It will be interesting to see what the dealer diagnoses.
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Old 12-28-2014, 03:14 AM
  #160  
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So, about people visiting this thread, half of them had problems with their new C-class ?

But maybe many didn't vote ?
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Old 12-28-2014, 08:29 AM
  #161  
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Originally Posted by benzw205 View Post
So, about people visiting this thread, half of them had problems with their new C-class ?

But maybe many didn't vote ?
That's not really surprising. Remember that the car started out with two recalls ... the steering column inspection and the one for the bad Continental tires in the US builds. There have also been some minor, albeit common, electronic glitches ... problems with Bluetooth connectivity, error messages, fob problems, and door handle lights not working. While most of these have been really small problems, they do count as problems.

As production continues, there will likely be fewer of these small issues popping up as the sources of the problems are identified and rectified.
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Old 12-28-2014, 09:27 AM
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Remember that forums concentrate complaints or issues. Some people only post when they have an issue.

Obviously a thread like this even more so.
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Old 12-28-2014, 10:54 AM
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Originally Posted by richardamp View Post
Yes similar, when making basic turns I hear a knock or two sometimes. It doesn't happen every time and is subtle, but still very frustrating.
Are you planning on taking the car in? I'd definitely be curious to see what they diagnose your issue to be.
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Old 12-28-2014, 10:57 AM
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Originally Posted by Glyn M Ruck View Post
You don't mention what location the knock seems to come from. Is it effected by fuel level in the tank? With W203 & W204 a few critical users hear a distant knocking that was traced to the dual fuel level sensor units under the back seat. 203 & 204 had the castor bush issue & sometimes soft rear tranny mount that caused knocks in certain conditions. It can be things as simple as exhaust routing & fitment.

With W205 having seen a complete suspension redesign even with steel underpinnings we don't yet know of potential minor gremlins.
I tried to identify the location of the sound, but I haven't been able to pinpoint where it's coming from. Regarding the gas question, I'm at about 80% full right now, and have been noticing it from a couple of days after delivery.
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Old 12-28-2014, 11:10 AM
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Regarding the complaints about odd noises when turning the car at low speeds ....

... this may not be the cause of the problems mentioned at all, but there is a common problem concerning low speed turns with low profile tires. It is most pronounced in colder temperatures, and it is tire skipping. When turning slowly with low profile rubber, the tires can actually stick and then shudder or "skip" as they turn. This occurs at very low speeds, typically when parking or starting to move.

Again, this may not be what is actually happening here, but it is a very common complaint with cars equipped with low profile tires.
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Old 12-28-2014, 02:13 PM
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Originally Posted by gnus View Post
Are you planning on taking the car in? I'd definitely be curious to see what they diagnose your issue to be.
I did not notice this yesterday when I drove it. I will wait until if / when it becomes more consistent before taking it in.
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Old 12-28-2014, 04:29 PM
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Just helped my sister pick up a C300 yesterday. Saw a few on the lot that still had really bad gas cap fitments, but her's which arrived at the dealership on Dec 24th had a perfect fit. I guess they fixed the issue already with later builds. However, the "radio" font still sticks higher than the surrounding buttons.
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Old 12-30-2014, 11:40 PM
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Originally Posted by joshg1001 View Post
Just helped my sister pick up a C300 yesterday. Saw a few on the lot that still had really bad gas cap fitments, but her's which arrived at the dealership on Dec 24th had a perfect fit. I guess they fixed the issue already with later builds. However, the "radio" font still sticks higher than the surrounding buttons.
I didn't notice this with mine until I filled it up for the first time today. The access door to the gas tank is VERY poorly aligned. How much of a pain in the @$$ is this to get fixed?
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Old 12-30-2014, 11:43 PM
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Its the top edge of the cap that doesn't stick flush right? Stan made a thread about it. Apparently, the cap cannot be adjusted and the entire cap must be replaced. He said the replacement was better but not perfect.
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Old 12-31-2014, 12:43 AM
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Originally Posted by joshg1001 View Post
Its the top edge of the cap that doesn't stick flush right? Stan made a thread about it.
I wasn't able to find it. Mind posting the thread you're referencing?

Thanks!
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Old 12-31-2014, 12:45 AM
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Originally Posted by [email protected] View Post
I wasn't able to find it. Mind posting the thread you're referencing?

Thanks!
https://mbworld.org/forums/c-class-w...-replaced.html
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Old 12-31-2014, 12:46 AM
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i took the car back twice. Once was for a chip on the aluminum door trim and the other time the alignment was a bit off. Other than that everything else is fine
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Old 12-31-2014, 02:23 AM
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Originally Posted by Glyn M Ruck View Post
That's wierd. The Hall sensor circuit is dual channel. For both to go down at the same time is to say the least unusual. Make 'em fix it.
Ugh, just my luck. The dealer said the shop Forman can't see the code that I pulled on my ODB2 scanner. They can't act on it because they need to find it. So they're keeping my car until next week. Such a waste of time. I uploaded the video I recorded of me running the ODB2 scan on YouTube and sent it to them. Not sure if it helps since it shows that the code was in the pending code and not in the stored code section. So it probably cleared itself, and no CEL was triggered.

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Old 12-31-2014, 04:15 AM
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Yep! Pending means the number of times triggered is below CEL threshold. Hope they fix the issue.
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Old 12-31-2014, 07:00 AM
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The Xentry diagnosis used by authorized dealer is totally diffrent from cheap ODB readers, Xentry cannot use or translate the codes presented by other systems, so dont be surprised why your dealer cannot use your data.
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