When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Our 2018 GLE550e is throwing a B11C11B error message, which I believe is related to an auxiliary battery. I'm amazed that Mercedes felt it necessary to put 4 batteries in this car.
001-982-82-08-26 Primary 12v 92Ah battery was replaced last October and is testing fine at 13+ volts.
000-982-96-08 Auxiliary 12v 12Ah starter battery is the original, but it is testing fine at 12.98 volts.
The 8.7 kWh lithium-ion battery is fine.
So that leaves me with the 000000-004039 auxiliary 12v 1.2Ah battery.
I have searched the forum, please don't get mad at me. Where is the auxiliary battery located? I'm asking based on actual experience or knowledge of the 2018 GLE550e. I know people have the best intentions of assuming everything is the same as other W166 models, but I assure you, the GLE550e always seems to do something a little different. Is it located under the rear seat, and is removal of the seat necessary?
Further to my location question, is there a comprehensive explanation of what the 000000-004039 auxiliary 12v 1.2Ah battery battery does? As you can see in the below image, there are 4 batteries. The one labeled as "C" is already an auxiliary battery; why does this car need a 4th battery?
In my research of the forum and youtube videos, there are many discussions of battery "C" and battery "D", but I haven't seen a discussion when both are found in a car.
I found this (attached) in WIS yesterday. I think it's applicable to your truck. Hopefully it will be helpful.
Thank you for sharing.
There is no 000000-004039 auxiliary 12v 1.2Ah battery in my GLE550e. Mercedes thinks there is, but there isn't. The battery shown in the document you shared is the auxiliary. I replaced it and have not received any error messages yet.
07-22-2024, 10:41 PM
