Hi!

I have a 2016 GLC 350e Hybrid. Recently i have got some problems with the car. It gives a red battery sign and says "Malfunction". This have been here for some weeks, and there have been no faults at all, just this message popping up when unlocking car.

But yesterday it came a new message also "Towing of vehicle not permitted", and the car would not start at all. I took off/on the poles on the 12V battery and after it worked. Same happened today, and it didnt help taking on/off the battery. So now the car dont work at all.

My question is, have anyone ecperienced this before, and did they find a reason?

I am planning to change the 12V battery even though its tested OK, and the auxilary battery, before i deliver it to the MB workshop (they have months waiting time and the car is out of warranty).

Regards

 

Definitely put a charge on it. If nothing else it will help troubleshoot your situation.

Your hybrid battery may still be in warranty - I think it's 80,000 mi, 8 years, but verify.

 

As another forum member mentioned, that looks like your high voltage battery/hybrid battery having issues, the symbol doesn't look like the starter 12V battery for example, as that symbol is usually just one battery cell. Towing not permitted is because the vehicle is not letting you shift to neutral so if you tow it, it will likely damage the drivetrain. Interesting that unplugging the 12V battery resets it I guess the reason it came back is because the computer did a test or two and determined there is still an issue with the high voltage/hybrid battery so the message came back.

 

Thanks for answering :-) I tested a brand new 12V battery yesterday because we had one at my job, but as expected it didnt help.

And thanks for the information about warranty, i found something about 6 years on the hybrid batteries:. The car is registered in 2017 and sold as 2017 model.

 

Thanks for answering :-) I have spent some time "Googling" this and reading in forums, but i havent got any wiser on this. I guess i have no other choice than to take it to the dealer :-)

 

Did your scanner at least pick up a stored code?

For illustration purposes, here is how the 12V battery symbol looks like: https://cimg5.ibsrv.net/gimg/www.mbw...8360024c3.jpeg

 

Hi, I'm having the same issue. What was the issue with the car?

 

Hi,
I've a 350e (2015) with the same issue. Battery malfunction warning and not working hybride system. Charging by a cable is not working either.

How was the malfunction warning resolved?

Regards
Ab

 

I had exactly the same thing on my 2017 GLC350e and its already in service for 2 months, there was an issue with battery heating device and then some other things kept breaking down.
the repairs cost is mounting up and is already 15 k $. I am shocked and looking for a lawer.

 

Towing not permitted of course means the vehicle must be flat-bedded to the dealer. Even in neutral with the parking brake released, AWDs shouldn't be towed in the manner illustrated by the dash icon.

 

I had the exact same issue this weekend.
it was very rainy and blowing a lot. And it was very wet around the charging point but I couldn’t see any moist in the contact point for charging. I was told to inspect this as first step.
the day after it was dry outside and I was able to start the car and drive it for 10 min and same fault messages came back.

so I guess I’m heading for the MB dealer again. About a year ago I changed the PTC heater/battery heater and the error messages were about the same as this. After changing the PTC a malfunction battery icon appeared from time to time with no defects or change on the car. And I could find no pattern in when it appeared. Now it seems like it’s in an emergency mode when it starts and runs.
since the PTC is already changed I wondered if anyone had an update for this thread. What was the solution?
I guess this is a high voltage issue and few unauthorized dealers can handle this is what I’m told. I’d did cost me 7000usd to change the PTC last year at the Norwegian Mercedes dealer. So any tips away from them is helpful.

 

New 48 V battery issue! Just purchased a new 2024 GLS. It was the General Manager wife's vehicle with 5000 miles on it. Titled as new. so I thought that it should be a great vehicle! Had driven it only 500 miles when the warning "48V Battery See Owners Manual" came on. It has been at the dealership for 6 day and they say that they can't do anything but wait for MB Engineering to tell them what to do!!! They don't know whether the battery needs replaced or if it is a code issue. Not happy with the response time from MB Engineering!!!

 

Whenever I see the big black (usually GM) SUVs on the news carting government dignitaries around DC and elsewhere, I wonder if these vehicles are being built without the 48 volt mild hybrid systems, or if they're programmed to operate even when the 48 volt systems go haywire. I can't imagine the government, in pursuit of its official duties and election campaigning, tolerating the inconveniences that are being shoved at us ordinary folks.

 

Conspiracy?
I don't think General motors uses 48 volt systems in any of their SUVs, or other cars in this country for that matter. Or other cars in this country for that matter.

 

That's good to know -- not enough to make me buy a GM, but still good to know. I guess GM just leap-frogged all the way to full EVs to save time.

 

48 V Battery Update. After 9 days. Delay mostly due to the dealer not able to do anything without out MB Engineering in Germany approval and the time difference, the problem apparently was due to a loose ground connection! Hopefully, problem fixed!

 

Were you able to fix this issue? This came up on my 2019 GLC350e. The A/C compressor had already been replaced about a year ago. Now it’s a sitting brick trying to figure out what’s wrong. It seems that the HV battery not charging the 12V battery. I also got a code P06A0 which is related to a fault in the AC compressor circuit. Does any one have an electric schematic for a 2019 GLC 350e? Thanks for the help.