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Discussion Starter #1
I bought a 2017 GLC 300 4MATIC at the end of November.

About a month ago, I started noticing an intermittent faint vibration in the steering wheel while driving at highway speeds.

It feels like the vibration of the tire treads rolling over the road is being transferred to the steering wheel. When I first noticed it, I assumed it was the result of driving on rougher sections of pavement and/or the Nokian snow tires I have on it for the winter.

Earlier this week I was driving on a highway that was repaved a few months ago, is very smooth, and in very good condition. As I was driving, I noticed that the vibration sometimes occurred and sometimes didn't.

At one point I was driving on a level part of the highway cruising at 100Km/hr and there was no vibration. Then I started climbing a small hill and as I opened the throttle to maintain 100K, I could feel the vibration again.

When I reached a level part of the highway again, I experimented by accelerating and decelerating. I was able to produce the vibration everytime I accelerated and make it disappear by decelerating. I also found that the more I opened the throttle, the more intense and noticeable the vibration was. When I released the accelerator and so the throttle was at idle, the vibration would disappear.

Note I was not accelerating hard or bring the RPM high. In fact, very light throttle applications would produce a noticeable vibration. Every test acceleration I did was in comfort mode, in drive (not manual), and the revs stayed in the 1,800-2,500 range.

I've owned 7 other cars prior to the GLC, have driven countless other cars, and this is the first one where I have experienced anything like this.

It is a relatively new phenomenon and has not been occurring from day one. I can't remember if I noticed it immediately after I put on the snow tires in late December. I'm pretty sure I did not notice it until several weeks after.

I'll probably wait and see if it's still there after I put the summer tires on before asking my dealer's service department to investigate.

Is anyone else experiencing this?
 

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Discussion Starter #4
At what speeds do you feel it? Could just be a wheel balancing issue?
I thought it might be a wheel slightly out of balance. However, I am 99% sure the vibration started to occur about a month after I got my snow tires put on. I would think if it was a balance issue the vibration would have started immediately after putting the snows on.

Also, the vibration is there at speeds above 75 Km/h and only when I'm accelerating or climbing a hill. If cruising on a level road and/or decelerating, there is no vibration.

A few years ago I had a wheel out of balance and the vibration only occurred at specific speeds and regardless of whether I was accelerating or not.

I'm going to put my summer wheels and tires on in about two weeks. If the vibration is still there after the change over I will take it in and have it looked at.
 

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Hmm... I'm just hoping that vibration doesn't cause damage to anything else like a bearing or something. That's really weird though.
 

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Hmm... I'm just hoping that vibration doesn't cause damage to anything else like a bearing or something. That's really weird though.
Over time it could very well and we'll have to wait some time for that to happen, but hopefully not.
 

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Discussion Starter #8
Do you have the Driving Assistance Pack?
I do have the Driving Assistance Pack. The unwanted vibration I am experiencing is very different than the one created by the driving assistance system though. And, it is constant while driving at highway speeds. The one created by the driving assistant system only comes in short bursts when the system thinks I need to be warned about something like driving outside of road lines.
 

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A vibration in the steering wheel at specific speeds tells me there is likely a wheel imbalance issue. Reaching a bit, there might be an off chance of an alignment issue. Things like bad bearings tend to be there all the time or are heard when the bearing is loaded like in a turn.

You may have picked up some large rocks in the tread or lost a wheel weight. Inspect the tire tread for debris and give the wheels a good cleaning. As you mentioned, if the symptom is gone when you go back to your summer wheels/tires, have the winter set re-balanced.
 

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Discussion Starter #10
I had the summer wheels/tires put on March 1st. The vibration is still there.

Note it occurs at all speeds (not just during specific speeds) above approx. 90km/h when accelerating or cruising. The harder the acceleration, the more intense the vibration. When cruising it's mild. When decelerating, it's imperceptible.

Part of me thinks it's the vibration of the engine somehow being transferred through the mounts to the frame to the pinion housing/steering box to the steering wheel column.

My GLC300 is the first four cylinder car I've owned. I am a little surprised at how noisy and "buzzy" the engine is. Maybe the vibrations I'm feeling are just par for the course with a four cylinder engine.

Having had the car for 3-1/2 months now, I wish I had gone for the 43 instead as I'm sure the V6 is much smoother and quieter.

Anyways, I will book it in to have it looked at.
 

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Having had the car for 3-1/2 months now, I wish I had gone for the 43 instead as I'm sure the V6 is much smoother and quieter.

Anyways, I will book it in to have it looked at.
Smooth Oh Yes....Quiet - **** no....it gets louder by the day. I'm sure some of the blue rinse brigade in our village regard me as a hooligan driving this loud foreign car >:)
 

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Discussion Starter #13
Any update on this yet? Very curious as I'm about to purchase a GLC 300 Coupe.
I had the winter 19" wheels/tires taken off a few weeks ago and the summer 20" ones put on. The vibration is reduced but still there at speeds above 95 Km/h, especially when accelerating (even very light acceleration).

Before I bought my GLC, I took one for a test drive and it was as smooth on the highway as it was off. I also test drove an Infiniti QX30 (which is an Infiniti body on a Mercedes GLA chassis) and it was smooth at all speeds too. With mine, I never noticed the issue until I had my winter wheels/tire put on (had 2,500 Km on the ODO at the time of the install). The tire shop that did the work over torqued the lugs. I didn't notice until several days later when I looked at the work order and saw 106 pound-feet.

I'm no expert but I'm thinking wheel bearing. Maybe it was from the lug over torque or maybe just a defective bearing that didn't reveal its defect for the first 2,500 Km. Maybe the vibration is normal and I didn't notice it until I got to know my car. Maybe I'm just hyper sensitive after having the lugs over torqued.

I'm going for a 600+ Km highway drive tomorrow with a friend. I'm going to have him drive it and see if he notices it too. If he does, I will book it in. I'm hoping he tells me I am not crazy and I hope Mercedes doesn't declare it normal. I would like it fixed as approximately 80% of the driving I do is on the highway and having a constant vibration in my hands is annoying and sometimes a bit fatiguing.
 

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Discussion Starter #14
Smooth Oh Yes....Quiet - **** no....it gets louder by the day. I'm sure some of the blue rinse brigade in our village regard me as a hooligan driving this loud foreign car >:)
At least the 6 is loud in a good way; it has a very nice growl. The 4 sounds like a hybrid between a diesel and a Japanese tuner.

If I had the 6, I'd want to hear it all the time. With the 4, I'm always wishing it is quieter so I don't have to hear it.
 

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Discussion Starter #16
I'm going for a 600+ Km highway drive tomorrow with a friend. I'm going to have him drive it and see if he notices it too.
He drove it and could feel the vibration too. I'm getting it in to have it looked at as soon as possible.
 

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Discussion Starter #17
I took it to the dealer today and had the service manager take it for a drive. He could feel the vibration but at this point he won't commit to saying it's a problem or a "normal characteristic"; he first has to drive another one for comparison purposes and then submit a report to Mercedes-Benz Canada.

He believes there are some software updates for the steering system so they're going to book mine in to have a look at possible causes and apply any applicable software updates.
 

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Discussion Starter #18
I'm sure with a few tweaks you can get that 4 to sound a bit beefier and more growling ?
I'm sure I could. With the announcement of the GLC 63, I think I'm going to save any money I'd spend on tweaks and use it help buy a 63 when mine is due for replacement.
 

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I'm sure I could. With the announcement of the GLC 63, I think I'm going to save any money I'd spend on tweaks and use it help buy a 63 when mine is due for replacement.
smart move since not enough people focus on placing a bigger deposit to lower monthly payments, often people just go for the bare minimum. hopefully when ready your dealer will have good financing
 

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Discussion Starter #20
The dealer checked the balance of all four wheels and they were all balanced properly.

They installed a software update for the steering system that resolves a known issue where an oscillation occurs in the steering rack when driving over bumps. The software update is meant to specifically address the problem that others have been discussing in the this thread: glcforums.com/forum/322-glc-issues-problems/2418-wheel-vibration-over-bumps.html

After the software update was installed, the service manager took mine for another test drive and said the vibration is gone and he feels the issue has now been addressed.

I haven't had a chance to drive mine at highway speeds yet to confirm but at slower speeds everything does feel a bit smoother.
 
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