Dead Battery, Red Stop Vehicle message, Roadside & Dealership Report
The service advisor told me to connect the battery charger, press the start button twice in order to turn on the radio but not start the car, foot on the brake and then pushed down on the shifter but not all the way.
That did not work.
The fellow who put my car on a trailer (for the second time) remembered that at the dealership they did not open the hood. So, we closed the hood, I pressed the brake, then the start button twice quickly and then I pushed gently on the gearshift and the car went into neutral. The battery charger was not connected although it had been connected for about 10 minutes before we made this attempt.
It's not an exact science because if you don't push far enough on the shifter nothing happens and if you push too far it will not work.








Simply open the driver door before going through the Neutral gear procedure.
I used to get puzzled watching my new Benz deeply draining my battery....
You'd think by now the A-team had a chance to design a reliable battery management.
Last edited by CaliBenzDriver; Dec 15, 2021 at 03:29 AM.
Simply open the driver door before going through the Neutral gear procedure.
I used to get puzzled watching my new Benz deeply draining my battery....
You'd think by now the A-team had a chance to design a reliable battery management.
The Best of Mercedes & AMG
I went to the Mercedes service and I have to left the car there.
I will update my post when I know more.
(sorry for my bad english)
Today I was about 20 miles into a drive of mostly highway driving when I got a yellow message about the 48v battery, followed immediately by a red "Malfunction" message. Within seconds I lost power and the "Coolant Too Hot Stop Vehicle Turn Engine Off" message appeared.
Unfortunately I was on the highway at highway speed. Fortunately I happened to be in the right lane and was able to get to the shoulder just before a bridge would have meant I was stuck in the right hand lane. I turned the engine off, waited five minutes, turned it back on. The engine info screen showed one temp at maybe 130 with a redline of ~ 240. I believe this is transmission temp? Or maybe coolant temp? The second temp looks like oil and was maybe 220 with a red line of about 275. About 1/2 between the blue and red lines which are presumably low normal vs high normal.
I was able to accelerate from there pretty aggressively back into traffic (thank goodness) and continue on to my destination. I drove back about 25 / 30 miles and neither temp ever got close to the red line.
Called Mercedes service and am waiting on next steps.
Very disappointing. Now my wife is apprehensive about driving it on the highway.




Today I was about 20 miles into a drive of mostly highway driving when I got a yellow message about the 48v battery, followed immediately by a red "Malfunction" message. Within seconds I lost power and the "Coolant Too Hot Stop Vehicle Turn Engine Off" message appeared.
Unfortunately I was on the highway at highway speed. Fortunately I happened to be in the right lane and was able to get to the shoulder just before a bridge would have meant I was stuck in the right hand lane. I turned the engine off, waited five minutes, turned it back on. The engine info screen showed one temp at maybe 130 with a redline of ~ 240. I believe this is transmission temp? Or maybe coolant temp? The second temp looks like oil and was maybe 220 with a red line of about 275. About 1/2 between the blue and red lines which are presumably low normal vs high normal.
I was able to accelerate from there pretty aggressively back into traffic (thank goodness) and continue on to my destination. I drove back about 25 / 30 miles and neither temp ever got close to the red line.
Called Mercedes service and am waiting on next steps.
Very disappointing. Now my wife is apprehensive about driving it on the highway.
There should be a computer trail as to what happened and hopefully service will be able to correct the problem.




There should be a computer trail as to what happened and hopefully service will be able to correct the problem.
Forget MB-USA ... tell your story directly to the service manager and kindly ask them to do you a favor by escalating to German helpdesk.
CYA for 2nd related visit:
Provide your expectations in writing so your demands land on the dealer work order word by word. SA are trained to write extremely vague orders...
If your car wrecks there will be more than insurance and lawyers in the loop.
It's not like MB is totally clueless about this class of power issues .
🤞
Last edited by CaliBenzDriver; Oct 3, 2022 at 07:28 PM.
Thank you
Last edited by vinnybenz; Oct 3, 2022 at 08:18 PM. Reason: wrong reply person
Today I was about 20 miles into a drive of mostly highway driving when I got a yellow message about the 48v battery, followed immediately by a red "Malfunction" message. Within seconds I lost power and the "Coolant Too Hot Stop Vehicle Turn Engine Off" message appeared.
I didn't push on the German Helpdesk idea ... yet. If this happens a second time (and I'm not dead) I will be a lot more aggressive.
FYI there is a class action lawsuit underway for 48v battery issue, but that appears to be more focused on not starting due to 48v issues versus loss of power while driving. That said the firm of course wants as many plaintiffs / class members as possible. Not reaching out them them yet, but sharing the link here if others are interested.
https://thelemonfirm.com/2022/03/21/...ttery-problem/
My wife is already asking if we can sell the SUV. Very bad and incredibly disappointing.
Chris




Round one of diagnostics with Mercedes is disappointing to say the least. I'll include the tech's notes below, but the summary is he disconnected the 48v battery, checked for a good ground on the battery and all other connections. All those were fine. Did a road test which went fine. Done.
They now want to give it back without determining any root cause nor fixing anything. I did get an updated service bulletin (LI54.10-P-069698) for this issue. v9 is the latest I can find in this forum / online anywhere. Current version is now 16 which I've attached.
I didn't push on the German Helpdesk idea ... yet. If this happens a second time (and I'm not dead) I will be a lot more aggressive.
FYI there is a class action lawsuit underway for 48v battery issue, but that appears to be more focused on not starting due to 48v issues versus loss of power while driving. That said the firm of course wants as many plaintiffs / class members as possible. Not reaching out them them yet, but sharing the link here if others are interested.
https://thelemonfirm.com/2022/03/21/...ttery-problem/
My wife is already asking if we can sell the SUV. Very bad and incredibly disappointing.
Chris
As you correctly posted, not very encouraging at all. I do not know what I would do, but I would not expect my wife to drive this car. You may have to drive it for a while, and afterwards if everything is fine, then convince her to drive it.
Remember "Happy Wife - Happy Life!"




MB is purposely building these cars with numerous gotchas in every systems then not helping the dealers left in charge of milking scared customers.
The expectations are that barely escaping a wreck should motivate owners to trade in a car ASAP with plenty of resale potential left in it for CPO business.
They are too many design weaknesses that contribute to modules restless chaos. It does not take a rockect scientist to make these cars meet standards.
Mercs can really perform like no other once milking issues are honestly eliminated.
Last edited by CaliBenzDriver; Oct 7, 2022 at 12:04 AM.
As you correctly posted, not very encouraging at all. I do not know what I would do, but I would not expect my wife to drive this car. You may have to drive it for a while, and afterwards if everything is fine, then convince her to drive it.
Remember "Happy Wife - Happy Life!"

Me driving it initially is the plan, but my wife's response was it took 1,300 miles for it to manifest the first time so how do we ever have confidence it won't happen again? Especially given MB hasn't actually done anything. And she's 100% right. Realistically we need to drive it probably 5,000 miles to have reasonable (but not complete) confidence this won't recur. Which isn't realistic so ... 🤬.
And our second vehicle is a F150 which she isn't excited about driving (big for her).
This puts us in a world of hurt.




MB is purposely building these cars with numerous gotchas in every systems then not helping the dealers left in charge of milking scared customers.
The expectations are that barely escaping a wreck should motivate owners to trade in a car ASAP with plenty of resale potential left in it for CPO business.
They are too many design weaknesses that contribute to modules restless chaos. It does not take a rockect scientist to make these cars meet standards.
Mercs can really perform like no other once milking issues are honestly eliminated.
Unless you have inside information, MB doesn’t make any money on used cars. The dealers do.
So the dealers and MB are colluding together to sell unsafe cars so people trade them in and dealers make more money?
I’m sorry, but I would have to be pretty stupid to think, I almost died in my Mercedes, I think I’ll trade it in for a new one.
It makes no sense to me. I don’t know the explanation for the problem but, I don’t buy your explanation.










