I received my 2025 E450 4 days ago.
I just wanted to take the car for a drive and when I started the car, everything is malfunctioning, active brake assist is not working, SOS inoperative,rear axle steering malfunctioning, pre-safe in operative, active emergency stop assist unavailable, restrained system. Malfunctioning, service required, front airbag not working active blind spot assist and exit warning inoperative.
i’m bringing the car tomorrow for service and we’ll see what they’re saying.
Did this happen to anybody else and what did they do about it?

 

With all that wrong, I’d have them come pick the car up. I’d be hesitant to drive it.

 

Just reported here
https://mbworld.org/forums/e-class-w...ions-w214.html

 

Have you tried disconnecting the battery in the trunk for a few minutes like another forum member had done?

 

No. I’ll let Mercedes Service figure out what’s wrong because I don’t want this to happen in.

 

Sometimes that is the better choice. On the other hand, if it does happen again, knowing how to fix it or at least do a workaround to get you moving could be the difference of being stranded for hours verses getting back on your way.

 

I agree.
I brought it today to the service department.They think it just needs a software update.Let’s see.

 

Wolf, why were you suggesting the battery in the trunk. That is the 48V battery, and does not run any of the car features, they are all handled by the 12V battery in the engine compartment. Just wondering, thanks.

 

It seems that the main reason he is suggesting it is because if you view a similar topic on this matter at: https://mbworld.org/forums/e-class-w...ions-w214.html
You will see that a user with a W214 who had similar issues called Mercedes Roadside disconnected the trunk auxiliary battery for 2 minutes, and all the warnings/malfunctions went away until they got it serviced. It seems to be a temporary fix for the issue, however I cannot confirm personally.

Quoting the user he said: "The Mercedes Roadside Assistance just left. Apparently my car was the 3rd car that had the same issues in Dubai today. They are blaming a software update (although I can’t really see if there was an update in the recent days).

They disconnected the battery in the trunk, waited two minutes, reconnected the battery and all the error messages are gone and the car is driving."

 

The other thread that taphil references above with a similar issue said that when the service tech came out...

"They disconnected the battery in the trunk, waited two minutes, reconnected the battery and all the error messages are gone and the car is driving."

I also thought that the battery in the trunk is the 48V, but it's actually the 12V. Says so right on the battery.



Only the negative is accessible through the panel however there is a positive access terminal under the hood for the 12V. I'm not sure where the 48V battery is. Likely not very accessible without some disassembly.

 

Wolf, you are correct. I thought that location was the 48 volt battery. I looked under the hood where the battery has been for the W212 & W213, and it looks like the 48 volt may be there.

 

If you are talking about the red terminal under the plastic on the back left as you are looking under the hood then that appears to be 12V as well. The red slider to expose the terminal has 12V stamped on it. It appears to be where you can clamp jumper cables on the battery that is in the trunk.

 

Here's the rescue card:
https://rk.mb-qr.com/en/214.061/

Here's the 213:
https://rk.mb-qr.com/en/213.0/

 

I remember pulling that up for my car and seeing the battery location but when looking yesterday, the 12V is stamped under the hood right where the 48V is shown on the diagram. I'm guessing it's a remote terminal for the 12V in the trunk and that the 48V is under that but haven't dug deeper to see.

 

Yes it's most likely the jumper terminals (and can be used for battery tender as well). I have a GLE and the 12v is under driver while 48v is under front passenger. I plug my 12v tender under the hood where there's a 12v red sliding cover and nearby is a negative post.

 

What did they say and do?

 

Let us know what the outcome was with the malfunction according to the dealer. I'm starting to get nervous, my 2025 All Terrain should be in at the dealer in November.

 

@udimor - what was your outcome? Did they do a software update to fix the issue?