Eaton

This update isn't part of a recall or campaign so it unfortunately does not get applied unless you ask about it or run into the issue.
I agree that something needs to change and updates need to be more readily available. This is an ongoing pain with them and hopefully MB will continue to improve in this area.

nc211

why would it be the customer’s responsibility to even be aware of this update to ask for it? Additionally, if the update can fix it, then it should be able to prevent it in the first place, meaning it should’ve been already applied the moment ANY of these cars sees a dealership for whatever reason, or better yet, over the air. THIS is the garbage attitude of Mercedes Benz, and in my own opinion, the root cause of the horrible service. “Wait for it to break” is a great way to get cement your reputation as an unreliable manufacturer of products.

I’m willing to bet this mysterious update costs $500 for those out of warranty too, hence why they don’t just issue the update in general. Reminds me of the synthetic ballbearings of GM in the 90’s on things like power steering pumps and alternators that mysteriously failed between 45k - 50k miles…

glc300Merc#des

2023 GLC 300 purchased in June with 1600 miles. Dropping off at dealer this afternoon. Would you have happened to have an Apple AirTag attached to your key fob? I'm curious to know if this would affect the transmission.

Baltiway103122b

I bought the vehicle new on June 29, 2023
I followed your instructions, and went to the Manual Page 190. From Home to Settings to Vehicles. It only has Car Wash Mode, and no Standby Mode. Did I get instructions right?

Gitzer

Looks like maybe you went to “Driving” after “Vehicle”. You need to go to “Open/Close” (not “Driving”). Only under the “Open/Close” heading will you see “Standby Mode”.
I see “Car Wash Mode” under “Driving” in my car (manufactured in May, picked up in July).

Gitzer

Here is my screen, does your’s look like this?

Baltiway103122b

Thank you for the photo.
How to get to this screen?

Gitzer

As stated in my original post, settings>vehicle>open/close.

Baltiway103122b

[QUOTE=Gitzer;8874934]As stated in my original post,

Engine off.
From Home to Settings to Vehicle to Open/Close.
Press Standby Mode.
No confirmation that the Standby Mode is on?

DESAL

Thanks for reporting. QUESTION Why aren’t you on the phone or at the dealership? Some cars have experienced similar problems. Nothing you’ve done. At a minimum your 12 v might have to be replaced. I’m sure if you ask the SA he/she will tell you when the computer senses something wrong it causes other reactions.

AgilityControl

Those auxiliary batteries are used a lot in Mercedes-Benz, especial with start-stop systems, and they only last 2-3 yrs IMHO.

W205C43PFL

The aux battery was replaced with a capacitor now, no? I mean the W205 for example has an aux battery but someone took it apart and it was literally a capacitor.

AgilityControl

Probably right, thinking of my 2013 C350, 12v in the trunk.

W205C43PFL

I see.. but I mean you are right too, they do fail sooner than expected even in capacitor form. I seen some reports here on post 2017 vehicles having failing aux.

PeterNik

I replaced the auxiliary battery in my S212 after 7 years of use.

nignog

Hi there, I had the same problem (I could not even lock the car). The car was one week old!!
30 minutes later, I started "normally". I drove straight to the dealer and They kept the car for the day and said the updated one of the computers... I have not had the issue since.

Galusz

Hi,
Could you please provide more details about the component that was updated in your car? I'm experiencing a similar issue with my vehicle, and understanding what was specifically updated would be helpful. Thank you.

nignog

Sorry, it happend again this morning... A 2 second bip and then the car is dead... Strange: the electric seats still worh as does the boot locking mechanism.
A quick fix: disconnect the batery and reconnect it. (a reset) and all is OK again... all that is needed is a 10 mm spanner. I took the car to the dealer and gave them hell. they kept it and said they had an idea to fix it...
We'll see.

ttik22

I have this happen to my wife few hours ago today. Same as what you describe in details. Initially I though it was the sensor because we just change our windshield. Then by reading more in to it and talking to the MB emergency hotline, it was the battery. The towing personnel says the same and that the battery is dead.

RA040624

Hello, I know today's the 25th of December but my 2024 GLC300 has left me stranded once again. The first time happened on December 6th where I went to unlock my car and I received all sorts of warning messages on the console and the car would not start. I had to have a tow to the dealership. The dealership said that it was a ignition software update. Today 14 days later I have the same problem. I am looking at lemon laws here in California shortly, but I wanted to reach out to you in case you had a interesting fix for this. Other than replacing the batteries. I put my voltmeter on both front and rear batteries and they are both over 12 volts. But I did get a message on my Mercedes app saying that my 12 volt battery was critically low. But that does not jive with my voltmeter. Unless it's and amperage issue internally within the battery. The car has 900 miles on it. Thanks for any advice or thoughts.

nc211

Very sorry to hear, what a grinch thing to have happen. I posted on here a while back about my 2024 dealership loaner GLC going crazy like this too. It was enough to make me no longer trust the brand right now, and the reason why I just wrote a check for a new car from elsewhere to replace my aging 2014 E350 with (which is a tank).

I would absolutely be pressing MB on lemon law here.

i did read somewhere on here that letting it sit for like 30 minutes might do the trick (allow the computer to reset I guess?) I don’t know. Maybe try it again?

dcarfora77

Welcome to the club. If you lock the car and let it fully go to sleep (about 5 minutes) then try to start it it will work. Albeit if it is very cold or hot outside it is not ideal but at least there is a workaround. In my case, the parking sensors and a few other modules needed an update and then we stopped receiving the critically low battery messages

RA040624

Well I live in southern California. The Glc is always kept in the garage. Unlocked in a secure environment. I don't lock the car at night.
I do not lock the car in the garage, I expect to approach it in the morning, sit inside it, press the button and start.
I don't want to perform any voodoo magic of locking it, waiting 5 minutes and having it try to reset itself. I went through a 6 hour or deal of just that getting stranded over this issue. Now I'm going back to the dealership tomorrow for the second time.
If this isn't resolved or pinpointed from Mercedes-Benz or the dealership I will pursue a lemon law.
Many people have said why didn't you just buy an older used car. Well my point is, is buying a new car. You want to avoid any mechanical past issues. That is the beauty of buying a brand new car. You are the first one to fart on the seat, you are the first one to do anything to it, and you are the first one to properly break in the engine for the first 1000 km. Km. You don't know what you're getting when you get a lease buyback, Or buying one form a private party. And I'm not just talking Mercedes here.
To have a personal mechanic checkout, various cars can be vary time consuming and get expensive. Thanks all.

6G Schnell

Thought GLC has a single 12 V battery. Today got email warning “starter battery is critical”, Shortly after that phone was showing low and then “discharged”…
Can you please explain where are these front and rear batteries?
Have Fluke digital multimeter ready to go.….

dcarfora77

Conventional Mercedes used to have AGM batteries (like my 21 c43). The new glc has a main 12 volt lithium ion which is insanely expensive to replace. The new glc also has a 48 volt battery which starts the car (there’s no starter motor anymore), allows the engine to shut off around 6mph when decelerating, and some other things I’m forgetting. Not sure where the actual 48v battery is located to probe (maybe in the trunk) but all of the voltages are located in the hidden service menu (not going to post how to access that in here as I don’t want to get banned but just look it up on YouTube. It shows state of charge, current voltage, amperage…everything you need to know)