2021 Mercedes-Benz GLS-Class Electrical System Problems

48V battery has repeated failures where I'm driving. safety concern, When it fail, it will pop up warning1) only drive below 50 miles/hour; then it becomes2) stop vehicle immediately; then ) multi-media system suddenly shut off while I'm driving. I tested by 48V battery which only has below 60% health. with 4 error code all related to V48 battery and management system: B183214; B183216; B183217; B183371; 48V battery is under Emission control component warranty which has 5 years/50000miles in Federal for MediumDutyVehicle and 7 years/80000 in WA state. My car is listed as MediumDutyVehicle in Mercedes service book. Mercedes refused to replace my unhealthy battery. Mercedes Charging me diagnosis fees for failure of V48 Battery. this should be waived since the part is under warranty Mercedes refused to provide battery health report to me even I explicitly asked from them, they just cleared the code and told me my battery is fine

On [XXX], I was heading home from work traveling [XXX] on [XXX] through Atlanta's usual heavy traffic. I smelled smoke inside my car and saw fire flames coming from under my passenger seat. My initial reaction was to try to put the fire out with my hat without burning myself. Also, I had to try to navigate across multiple lanes of traffic without hitting anyone and avoiding anyone hitting me. Safely, i reached the side of the interstate and exited the vehicle. As I stood from afar watching my vehicle burn; the reality sat it that a few minutes earlier that could have been me trapped burning inside, injured or even death because something had failed in my vehicle. Later, when I finally arrived home, I started researching on the internet to see if anyone else had experienced problems with their MB 450 GLS catching fire. Surprisingly, I found that recalls had been issued in April 2022 and March 2024 for a possible fire risk from a 48volt loose ground wire issue under the passenger seat. At that time supposedly there were no reported injuries or crashes related to this issue until now. If I am the first to witness this issue, then so be it because I saw the fire burning from inside under my passenger seat before it FULLY torched my vehicle I reported this issue first to Progressive Insurance and Mercedes-Benz Corporate. Progressive has provided my transportation according to policy for my first 30 days. As I approached the end of my rental period, I spoke with MB Corporate to see if there was anything that they could do as far as providing me transportation. I was told that there was nothing that they could do because they were not a dealership with cars to loan. The joint vehicle fire investigation was schelduled for 29 April 2025. On 25 April 2025, Progressive informed me that MB Corporate had moved the fire investigation date to 29 May 2025. NOW, what am I suppose to do? It has been almost two months that I have been without a vehicle. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6

System malfunctioned detail: 48v battery malfunction, 12v battery malfunction. Safety concern: I was driving on [XXX] , the battery malfunction warning suddenly pop up, and I couldn't accelerate my car beyond 30 MPH, my whole family were on the car during that time. it's life threatening issue needs to be addressed. Luckily we managed to pull over to a safe border way. It's first time I encountered this issue, but on [XXX] , seems like many people encountered it. Dealer is inspecting the issue currently. orange warning msg pop up first says "48v battery malfunction", few minutes later become red warning msg, while I pulled my car to the sideway, it became red "12v battery malfunction". INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Vehicle has just over 31k miles. ON multiple occasions, the vehicle randomly shuts off and displays a 48 volt battery error on the screen followed by a check engine light. This has happened in the middle of a busy intersection and at 75mph on the interstate. Each time it does this, I have taken it to a Mercedes dealer for repair/troubleshooting. THey perform the Mercedes required steps to repair the known issue and each time the issue persists. The car has been at a dealership for almost a combined 30 days now with no end in sight. I do not feel safe knowing that Mercedes cant seem to solve the problem and instead puts me back on the road knowing the car is not right and risks injury to my family as the issue has happened at low speed and high speed resulting in extremely dangerous situations for my family. I have 2 open PTSS cases with Mercedes USA (246121906 and 246113294). Researching this issue has revealed this is a known issue with their "mild hybrid" SUVS and many consumers have the same or similar experience to mine.

1. Unknown, smoke started coming from under the passenger side seat, car is a complete loss. 2. Smoke damaged my lungs, there was a large amount of exploding glass, and it could have led to a structure fire. 3. Not applicable 4. In process, but it was recalled for this issue 5. No

Cluster Information Display Black out on and off. Cannot see speedometer and headup display also turns off. Problem occured 5/13/22, 6/17/22, and 6/13/23. Problem is still not fixed after going to mechanic 3 times. 7/16/24 went in to mechanic again for the same problem but mechanic concluded that there are no further solution possible to fix this problem. When the problem occurs, the cluster information display is blacked out for about 3 to 4 hours, and only fixed when 1 or 2 days are fixed. It is dangerous to drive without the cluster display which includes speedometer, remaining gas, engine warning light, and many more important information that is needed and required to drive safely without crash.

We accepted delivery of our brand new vehicle in May 2021 from the dealer. In July 2021, the vehicle became completely disabled due to failure of the 48 volt battery. In October 2021, the dealer replaced 48 volt battery failed again causing the vehicle to become completely disabled. In December 2023, our 3rd replacement 48 volt battery failed. Each time the vehicle is out of service for a week or longer. The dealer is not providing any information about what may be causing the failures. Vehicle has become completely unreliable and dangerous. Mercedes Benz USA has offered us a 200 service credit and 3,000 off a new vehicle and advised they are not aware of any defects.

Incident 1: May 2022 Vehicle was sitting in driveway overnight and would not start in the morning. Had a 48V battery warning on. Towed to dealership. Said it was a delay software update. Incident 2: August 2022 Was driving 35mpg down the road where a warning sign comes up. Then shortly after the car slows down to around 15mph and would not speed up anymore. Towed to dealership. Dealership did not find anything "wrong" with vehicle Incident 3: November 2022 Car was parked in parking lot for 2 hours. When trying to start car, there was an error message saying stop vehicle. Towed to dealership. Dealership stating they might exchange a new 48V battery.

Car would not start, 48 volt system failure

Vehicle would not start on 3 separate occasions. The instrument panel indicated it was the 48v battery. Had it towed to Mercedes dealership to have 48v battery replaced.

2021 MERCEDES BENZ GLS450. CONSUMER WRITES IN REGARDS TO48-VOLT BATTERY SYSTEM FAILURE. THE CONSUMER STATED THE HAS FAILED TWICE, A YEAR APART. THE DASHBOARD DISPLAYED "48-VOLT BATTERY FAILURE" AND "CHECK ENGINE". THE VEHICLE WOULD FAIL WHILE BEING DRIVEN. THE VEHICLE WAS RESTARTED AND OPERATED AS DESIGNED. THE DEALER WAS UNABLE TO DUPLICATE THE FAILURE. THE CONSUMER STATED THE MANUFACTURER HAD DETERMINED A FIX FOR THE RECALL REPAIR.

Car turned on by itself, then 2 days later would not start. 48v battery system needed software update

Repeated failures of 48 volt battery system has shut vehicle totally off while under highspeed and in traffic

Car shut off while driving. Would not restart. 48 volt battery failure, needed software update