Black glass panel that fills the space between the windshield and sunroof has linear cracks that goes laterally left and right on top and bottom.
The worst 2026 Mercedes Benz GLS 450 4matic problems
Ranked by number of owner complaints. Mileage and cost come from what owners wrote.
- Engine1
Problems by type
Tap a problem to see which part fails, at what mileage and in which other years.
- Engine1
Recalls 2
Seat belts: rear/other: buckle assembly
- What is wrong
- Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2026 AMG GLS 63 4MATIC+, AMG GLE 63 S 4MATIC+ COUPE, AMG GLE 63 S 4MATIC+, AMG GLE 53 4MATIC+ COUPE, AMG GLE 53 4MATIC+, GLE 450 4MATIC COUPE, GLE 350 4MATIC, Maybach GLS 600 4MATIC, GLS 580 4MATIC, GLS 450 4MATIC, GLE 580 4MATIC, GLE 450E 4MATIC, GLE 450 4MATIC, and GLE 350 vehicles. The bolts for the rear seat belts may not be tightened properly.
- Risk
- A loose seat belt may not properly restrain an occupant during a crash, increasing the risk of injury.
- Remedy
- Dealers will tighten the rear seat belt bolts and replace any missing bolts, free of charge. Owner notification letters were mailed July 17, 2026. Owners may contact MBUSA customer service at 1‑800‑367‑6372. Vehicle Identification Numbers (VINs) involved in this recall became searchable on on June 5, 2026.
Recall number 26V353000 · Recall details
Air bags: passenger side frontal: cushion
- What is wrong
- Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2026 GLE 350 4MATIC, GLE 450 4MATIC, GLE 350, GLE 580 4MATIC, GLS 580 4MATIC, GLE 450 E 4MATIC, AMG GLE53 4MATIC, AMG GLS63 4MATIC, AMG GLE63 S 4MATIC, GLS 450 4MATIC, and GLS 600 4MATIC vehicles. The passenger air bag fabric may have been manufactured incorrectly, which can cause the air bag not to deploy as intended.
- Risk
- Air bags that do not deploy as intended during a crash increase the risk of injury.
- Remedy
- Dealers will replace the passenger air bag module, free of charge. Owner notification letters were mailed June 12, 2026. Owners may contact MBUSA customer service at 1‑800‑367‑6372. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on beginning April 3, 2026.
Recall number 26V199000 · Recall details
Technical service bulletins for the 2026 Mercedes Benz GLS 450 4matic 56
Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.
- Issue On certain subject vehicles, the transmission control unit (VGS) does not conform to current...
- Harsh upshifts, downshifts, or jolting in lower gears when accelerating
- Customer concern of Air Conditioning not cooling
- Subject vehicles were visible and flagged in VMI as “OPEN” under campaign 2026080002 in Netstar-VMI on...
- Issue A software update will be performed that provides enhancements to the robustness and system...
- Slight creaking noises when steering
- Power train
- Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
- Red coolant warning in instrument cluster
- Radio station cover art does not refresh when switching stations
See all 56 bulletins for the 2026 Mercedes Benz GLS 450 4matic
What 2026 Mercedes Benz GLS 450 4matic owners say
Most recent owner complaints, unedited.
The contact owns a 2026 Mercedes GLS 450 4MATIC. The contact stated that while his daughter was sitting in the rear driver's side seat and attempting to exit the vehicle, the speaker on the rear driver's door scraped her right elbow. The contact stated that the screw holes for the speaker had jaggedly sharp edges, and the holes on the speakers looked like perforations on a grater. The contact stated that the other shiny metal door speakers on each door were also sharp and posed a potential injury risk. The vehicle was taken to a dealer. The dealer did not believe that the screw holes on the speaker were sharp. The failure mileage was approximately 2,000.
On Thursday, August 20th at approxmately 5:30PM my 2026 Mercedes Benz suffered a catastrophic transfer case failure and driveshhaft failure at highways speeds, causing a complete loss of propulsion. Putting me in immediate danger of on coming traffic. After the got to the shoulder I waited about 3 plus hours in pouring rain waiting for Mercedes Benz roadside assistance. The safety of this vehicle put me, my wife and family in immediate danger if this happens again. I do have a video I cannot upload as is is too large, but have loaded an image of the car in service showing transfer case. Please let me know how i can share the video.
Compare the 2026 Mercedes Benz GLS 450 4matic
Other model years
20262027
Questions about the 2026 Mercedes Benz GLS 450 4matic
Is the 2026 Mercedes Benz GLS 450 4matic reliable?
Owners have filed 3 complaints about the 2026 Mercedes Benz GLS 450 4matic, close to a typical GLS 450 4matic model year.
What is the most common problem with the 2026 Mercedes Benz GLS 450 4matic?
Engine and cooling, with 1 complaint.
How many recalls does the 2026 Mercedes Benz GLS 450 4matic have?
2 recalls, covering seat belts and air bags.
VIN decoder
See the problems and recalls for an exact car
Buying a used 2026 Mercedes Benz GLS 450 4matic?
Check the exact car before you pay: accidents, salvage or flood titles, odometer readings and previous owners.
Check its history