Sigp232

Nothing wrong and most car manufacturers recommend doing brake fluid change every 3 years or 30k miles. Do your brake fluid change on your next service A. Look online your area dealers lots of service coupons also
Yelp Mercedes mechanics you’d be surprised how many good independent fair priced mechanics are out there.

DanD.

Sealing of recommended services, I have asked MBUSA their answers below, this is my first car
without mfg recommended services booklet, looks like they want us to go to dealers more often so dealer can tell us whatever they want.

I was able to find 2016 booklet and its available for download from MB website.

MB response:

We regret to inform you, the maintenance booklet was discontinued in 2017 for GLC model vehicles.

We may confirm, the service internal for your 2018 GLC is every 10,000 miles or annually, which ever comes first.

We apologize for any inconvenience this may cause and appreciate the opportunity to respond.

Your Mercedes-Benz service advisor is in the best position to discuss your vehicle needs at the time of service.

Roni07

Wow thanks. Discounted!? Can’t find info anywhere terrible MB customer care. I read an old service manual that said “break fluid replacement every 20,000 miles”.
still not clear why one dealer is doing B service without the break fluid exchange but the other is.
One changers $300 and the other $600.

DanD.

according to maintenance booklet for GLC 2016 brake fluid should be changed every 2 years, regardless of miles.

AllenChicago

April 12, 2024

I just purchased a 2024 GLC300. Less than 100 miles on it, but the car is extremely "jerky" when slowing down to stop....from 10mph to 0mph. It's very annoying. Watching the tachometer indicates that the car does not want to downshift properly. The Hyundai's in the family do this when the oil needs changing...or is low.

The oil isn't low in this new GLC300, but maybe it's broken down from sitting in the crankcase dating back to October 2023, when the car was assembled in Germany (according to the placard)?

Or, maybe the car is so "new" everything needs to be broken-in over a few hundred miles, before I complain.

My wife has a GLE350 that slows to a stop like the car is in neutral...with the brakes being the only mechanism engaged... smooth as silk.

I'll perform some internet searches to see what could be causing this in general, before going to the dealer. Hopefully it's something I can "fix", or something that will resolve itself. (The GLC300 I test drove at the dealer slowed to a stop perfectly...like my wife's car. But it had 3,500 miles on it.)

Anyway, just throwing this out there to see if anyone has experienced this problem with their GLC300 recently.

Allen in Chicagoland

DanD.

Im sure it wasn't jerky when you tested. So, its something car developed. Maybe it needs adaptation or trany reset in any case you need Xentry, You car is brand new just take it to a dealer let them worry about.

AllenChicago

Thank-you for your reply DanD.

I will likely do so, if the jerkiness when decelerating to a stop doesn't cease in another couple of days....or when the car gets over 500 miles on it. I didn't drive the one I bought. I drove a similar 2024 GLC300 that was on the lot... used for demonstrating the vehicle. The one I purchased (leased) was inside the showroom, with 5 miles on it.

Thanks again for the advice Dan!

-Allen in Chicago

mikapen

Mercedes transmissions are adaptive, meaning they learn your driving style and adapt. It'll likely settle down as you drive somewhat gingerly during break-in.

You can also reset the transmission yourself without going to the dealer.

The key steps (on our 2019 GLC) are:
Turn the ignition key to the "on" position, but do not start the engine.
Press the accelerator pedal all the way down and hold it for 10-15 seconds.
Turn the ignition key to the "off" position while keeping the pedal pressed down.
Release the accelerator pedal and wait 2-3 minutes.

This procedure puts the transmission control module into a "relearn" mode, allowing it to adapt to your driving style and reset any learned shift patterns.
It does not erase any other ECU programming.

AllenChicago

Thank-you. I've read about this procedure (from maybe a post you made elsewhere). But it seems to apply to cars that have been driven enough to pick up "bad habits"? My GLC300 doesn't have 200 miles on it yet, so there's no bad habits for it to unlearn. It's so unpleasant to drive around town, I shift into "N" when approaching a stop sign or stoplight. Then, it comes to a stop smooth as silk. Also, I've never owned a car for 5 days and barely drive it.

My Mercedes dealer contact person isn't in a hurry to get back to me, so I may have to have to just drive over there and find a mechanic to talk to.

Thanks again for providing the helpful advice. I'm sure a lot of other drivers-in-need will see it too, which is a good thing!

-Allen in Suburban Chicago

Roni07

DON'T BLAME YOURSLEVES. This is a Merceds Problem. I have GLE350 and GLC300. The GLE350 has a horrible rough transmission. No smooth shifting. IT doesn't know what to do. Very clunky and jerky transmission, it jolts you forward when downshifting , before a stop. This has been going on for years and Mercedes can't fix the issue. I hear Lexus has smooth transmission. Mercedes has a very glitchy software too.. also causes issues with transmission and shifting. Waste of time having to back to the dealer to ''Replicate' the problem. to be honest I don't have that issue any more. I traded it in for a Tesla. super smooth and super fast. I completely understand your pain, been there done that for years.

DanD.

As always there are some exemptions, our ML and GLC trany are very smooth. I can't stand Tesla's build quality and ergonomics, cheap plastics and road noise especially after ML/GLE
I would better go with Audi etron for EV.
But it's me. Hope you like Tesla.

AllenChicago

Thank-you for replying to my question. My wife's 2022 GLE350 shifts up and down very smoothly. I just don't like how "big" it feels when navigating, which is why I test-drove and opted for a GLC300 SUV last week.

The demo car drove fine, but the one I leased is going to be looked at tomorrow by the dealer, because the downshift from 3 to 2 and 2 to 1 when coming to a stop, is quite rough about 60% of the time. Was 90% of the time earlier this week. It's getting less obnoxious as the miles accrue. There are 210 miles on the car now. Am trying to keep the mileage low, because the car can be traded to an equal or more expensive vehicle within 30 days or 1,000 miles, whichever comes first.

Thanks again for sharing what your Mercedes experience has been like. Thankfully, our first, the 2022 GLE350 has been 100% trouble-free.

-Allen in Chicago

Roni07

- Yes MB GLE350 had much better build quality. Tesla is made with cheap plastic. However, Coming from GLE350 4Matic - I found the ride rough and noisy. As soon as got into the Tesla I was amazed of how quiet and smooth it was. There are better EVa than Tesla out there, however Tesla technology and software is the best in the world - all others try to imitate it but Tesla is 10 years ahead. I just tired self driving - FSD- compete blown away how accurate it is and how the car drives itself - neural engine writes its own code. I was at the Mercedes Dealership and talking to the service people - they said MB is trying to imitate Tesla - software wise - but is having lots of problems- service sees lots of the new 2024 vehicles in service with software issues and it takes hours to resolve and 4 hrs of updating the software - basically it’s a whole day appointment just to do a software update from Mercedes. MB doesn’t allow the customers to do it. Teska does its updates at home and it takes 20min to complete. No dealer visit. Love the MB interior and build quality but I can’t stand the noise and transmission jerkiness, rough ride , up/downshifting, tiptoe of 9 speed transmission sounds fancy but there’s a serious problem with it - I think it’s the software interacting with sensors and mechanics. Maybe next suv will be a Porsche.

DanD.

I'm so glad you like what you paid for, software it's totally different subject,
MB soft is not just bad, it's obsolete an outdated, they are trying to catchup, but problem is, most of the developer are offshore, same as Boeing, you get what you paid for, MAX soft was written by engineer for a few dollars, we all know what happened after.
At the beginning Tesla was hiring top candidates throwing money like crazy, now they are throwing (laying-off) workforces will see where it all goes.

so, you happy with what you got, I'm happy with what I have, hey, we are doing good !

W205C43PFL

There were new discoveries by other forum members on why the transmission may be behaving the way it does (in short, it is not able to react properly to the ECU's demands). The solution? The transmission issue likely have to do with the oil pump solenoid so unplugging it helps the transmission make correct shifts at the correct time, more on it in the big thread.

Roni07

LOL sounds like Windows XP, problems,!? Just Reboot. By “” unplugging”” do you mean removing the battery terminal ?
I recently had a cracked Fluid Washer Tank - replaced for $3,500. MB SA said this is common in Mb , due to vibrations etc I’m thinking so why wasn’t this fixed under a recall !? Follow the money.

W205C43PFL

No.

Oil pump solenoid, read more on it here: https://mbworld.org/forums/w212-amg/...solenoids.html

DanD.

Cracked Fluid Washer Tank due to vibrations, total BS, if it's true whole body must bend so bad so plastic will crack per where it sits on the car. Some heated washer tanks develops leaks but it's due to heating.
One of the comics should create a movie about manufacturers responses to customers requests, what kind of BS they throw at us, what IQ # do they think we have?

AllenChicago

Thankyou for the reference. I'll share it with my Mercedes Benz dealer technician when I take the car back to him on April 30th. He wants to keep it 2 days, because the 3 hours he had it last week wasn't long enough to figure out why the downshifting from 3 to 2 and 2 to 1 is frequently so harsh. The car is nearing 500 miles and is downshifting smoother with the "A" (Auto start/stop) left active, but not as smooth yet as my wife's 2022 GLE350.

W205C43PFL

Keep in mind this is an experiment, I would not recommend sharing with your MB technician, we don't want MB to intervene with what we are doing on the forums, this solenoid was intentional by MB anyways, we are technically going against what MB designed. Evaluate the risk or if you want to proceed with unplugging or not by reading that thread, especially if you have a warranty, this might void it.

Edit: Long story short this solenoid controls the oil pressure, and at low RPMs, it drops it from normal oil pressure to low to help save fuel, this solenoid's only benefit is to save fuel with many consequences discussed in the thread linked, hence why we decided to unplug it, to improve the longevity of the engine.

steven_steven

I got my brand new GLC 300 in January 2024, and it jerks slightly between D3 and D2.

I took it to the dealership three times:

1. The first visit was unhelpful. They told me the car shifts normally and there were no recorded errors.
2. During the second visit, the technician performed adaptation and reprogramming. The car started shifting much better than before. The jolt is almost gone. However, from time to time, I still feel a bit of light jolting if I need to stop more abruptly than usual.
3. On the third visit, they flushed the valves, but there was no improvement.

I am planning to visit MB again.

Unfortunately, the problem hasn’t been completely resolved. MB only masked it by adjusting the downshift time delay.

Roni07

I’m sorry to tell you this , but this is a common MB problem. I had this in my GLE350 4 Matic and in my GLC300. Transmission problems , super jerky, clunky and down shifting and confusion between engine and transmission, CPU can’t decide what to do. Mercedes isn’t worried about it , they’ve got our money , we’re now on the hook dealing with these problems. A Kia drives better than this luxury suv. Super disappointed. Unacceptable from Mercedes. Lexus transmission is super smooth. Under any circumstances do now own a Mercedes after the warranty expires 50-60K miles or 4 years. You will be on the hook with all the engine and tranny problems. Mine had leaks form so many places. Now the engine mounts are worn out and could start leaking at any time. This is right after 50K mi, repair is $1,500. How can they put out vehicles like that. Of I’m paying $60-80K for a vehicle. There shouldn’t be any problems for $100K miles. Looks great but zero dependability, quality or reliability. It’s huge money pit. You don’t want to be the sucker owning this past warranty expiration. MB thinks that my time is free, I’m sitting there in service for 4 hrs in a day. They hardly have any loaners and the shuttle drives you home or the mall and you are walking around there like a loonie looking at the displays for hours. Mercedes used to be very good long time ago , now it’s just looks but mechanics and electrical are horrible. Kind of like VW. Once you own one , you never want to have one.
wouldn’t own Mercedes , you’re better off with Lexus, Toyota, Kia , Huyinday, Anyway, this has been my experience.

AllenChicago

Since starting this thread and getting the transmission "reprogrammed from scratch" 3 times by the MB dealer, the GLC300 now shifts buttery smooth, both down and up, as long as the car has been running for a couple of minutes. If I leave the driveway within 30 seconds of starting the car, it still jerks hard at the first stop sign, which is about 800 feet from the house. But from that point forward, I have zero complaints.

It's even smoother than my wife's 2022 GLE350, when her Automatic engine cut-off is activated. When mine is activated, I can't feel it kick back in after the traffic light turns green, like her 350 does. But I keep it turned "off" most of the time, because the air conditioner compressor turns off also, when at the red light. My wife's GLE350 air conditioning compressor keeps running at the stop light, but I advised her to keep hers turned "off" too, because I've read of cars that don't start again when pressing the accelerator!

DanD.

Wondering what is on the paperwork form shop?

Roni07

This is only a temporary fix, the transmission learning never ends and sooner or later you’ll have the same problem again. This isn’t a fix but a bandaid 🩹 to keep them off their back, for now. How is this even acceptable for this experience since luxury SUV ? Every time you bring the vehicle to service with all of these problems, it gets recoded, and when you go to seek the car , when you run a CarFax report it’s going to list all of it. People will know it’s a lemon and won’t want to buy it and will give you way below value. I have the car fax app and all of my service records are there. 30 visits to the dealer , before 50K miles. Makes you wonder how Lexus is able to make their transaction super smooth and quiet 🤫 but Mercedes has been trying for the past 8 years and they just can’t do it. The new 2024s are riddled with problems.