Hi
My C-class 2008 comand knob rotary controller is not working. It works up-down-left-right, but rotation is not working. Any clue about problem? It just suddenly stopped. Please advise?


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Try using the "Search" feature at the top of the page. The has been discussed repeatedly.
It is a well-known issue and there is no fix except for replacement.

 

I just noticed the same problem literally 2 days ago.

https://mbworld.org/forums/search.php?searchid=8781856

 

Mine took 4 years to go bad. Part is pricey, and I'm not sure if I trust the ones on ebay.

 

Mine took 4 yrs too!

 

Mine just conked out. Went to the dealer and they told me my Warranty JUST expired and there's Nothing they can do. I'm like, seriously? Nothing at all? SMH.

 

Mine just broke down too at exactly 4 years..any clue on part and replacement costs?

 

Parts.com (OEM parts come from a MB dealer in Illinois. Good prices, Shipping is RAPE.)
Part number 2048700679

Cost me $209 total cost $180+shipping and handling.
Takes about 30 minutes to do If you just Rip Out the wire for the old piece after taking apart the center console piece.

Dealer wanted $327 for the same part + labor and tax.

 

Very helpful..Thanks

 

I love how absurd the prices are. If Mercedes made your computer mouse, it would probably cost $1000 to replace if the scroll wheel went bad (and notice how the scroll wheel on your computer mouse often lasts more than 4 years with far more use!!)

 

Well, it basically is a $300+ mouse with a bad scroll wheel. lol
Heck I might even play around with the old one and try to retrofit it to use on a PC.

 

Mine went bad also a month ago, after 4 years . It looks like they are "programmed" to brake after 4 ys.

 

I think I need to play with that knob much more often and hard, to let it fail within the warranty. Therefore, I will have a new knob free before the end of 4th year... jk.

 

I'm afraid I have to agree. What are the chances that we all had the same component fail exactly after the warranty was up?
I'm scared to think what else is "programmed to fail."

 

This is too strange to be a conicidence... I just had the scroll wheel "die" on my '08 C300 as well (roughly 4 yrs after it was made).

To qualify that, it isn't totally "dead" but the scrolling function does not work anymore, making it about 30% as useful/effective as it used to be (no more zooming in and out on the navi screen, and forget about trying to search for any music on long list or enter in address info in a reasonable manner).

While I dont want to go as far as suggest that MB consciously built the scroll wheel to partially short out JUST after the warranty (only to ask for upwards of 400 bucks to replace a 2 inch plastic/metal wheel), I do think this could perhaps be an oversight that should be brought to their attention. Has anyone thought of this?

I'm not a lawyer, but isn't this how recalls or free repairs/adjustments on certain products occur? Maybe in their first iteration of the new design for the C-Class, this was an error in manufacturing that obviously couldnt be known until now (the first '08s are just now 4 yrs old)? I feel like if enough signatures were collected or something, this would end up being a repair that they would have to be complimentary provided for all 2008 C-Class'.

For all I know there's no ground to stand on once the car is technically out of warranty, but I feel like it's a question that should be explored before we all basically decide to spend the equivalent of a Service A/B for this little non-critical (but significant) part of our great cars.

 

I wholeheartedly agree. However I don't think they bother with recalls unless it's a safety issue. More likely a technical bulletin so that dealers are aware it's a common problem and exactly what needs to be done to fix/replace it.

But yeah, Magically after 4 years we all face the same proble, Exactly outside of warranty.

 

Mine broke around the same time as well, after 3 years and 11 months. Had it fixed under warranty. I guess I got pretty lucky.

 

Where did you order the part from? I just bought my C300 less than a week ago and the knob (scrolling only) went out.

 

^

 

Just to add another knob with dead scrolling...and yes, coming up on 4 years very soon.

 

Thank you. I'll see what I can do as I want to correct it.

 

Got the same scrolling issues last month. But in addition to that, the COMAND unit would not start up when the car was on. Also, there was a disconnect from the steering wheel as I couldn't control volume, IPOD, etc, from the wheel. My COMAND unit would shut off after about 10 minutes of driving, thinking that the car wasn't on. Luckily my warranty covered everything.

 

So, in an ambitious effort - and after getting a ridiculous quote from my mechanic on replacing the scroll wheel (or "Push Button" as it's technically called) - I decided to buy the part and install it myself. I'm out of warranty anyway, so I figured I might as well give it a try.

I found a pretty solid guide on "opening up" the console which was pretty simple, and I was able to easily just unplug my old Push Button and replace it with a new one I purchased through an OEM dealer. Perfect solution that saved me time and money, right?

WRONG! The new replacement part literally had the same functionality as my old "broken" one (no scrolling functionality, but up/down/left/right and push+select and the "back" and "clr" buttons work).

Fortunately, I look at it as a lesson learned at not too high a cost because A) I bought the part for $130 (vs the $500 quote I was given) and B) the mechanics I normally use originally had said they would just replace that part if I had them do it (so would've been the same result just at the expense of me leaving my car somewhere and potentially ~$400 more dollars later).

I'm not totally braindead when it comes to DIY stuff, but now I'm pretty stumped. I've matched the part# exactly (and trust me, there are about 4 or 5 different part #'s for the Push Button on a C-Class depending on what features your car has), and still no results. My intuition says that must mean there's a short in a wire going from the car's ECU to the Push Button plug instead of problem with the Push Button itself... I'm praying though there's some small step I'm overlooking...

Anyone take a shot at this like I did or have any suggestions?

 

Part number 2048700679 on parts.com says it's actually the scroll wheel for 2010-2012 GLKs...

For 2010-2011 C300 it shows up at 2048708951... strange because that was the part # originally in my '08 C300...

Finally, for a 2008 C300, the part # is listed as 2048704558.

There is also a 2048707558 that doesn't match any model on the website, but it exists.

I just went with the 8951 because that was what my car had first and figured the flashware would be the same. I'm sure the difference part numbers have to do with whether or not you have GPS, CD/DVD Changer, etc.

But then again, the replacement 8951 still wouldn't fully work...

 

I think they went with 0679 because it has less of a failure rate than the one that came with the car....That, and that it Works. Should have went with the one I listed above 8951. My replacement works perfectly.