Every record we hold for this vehicle, as plain tables, with nothing added. The consumer page shows the same records with the maintenance schedule, price ranges and nearby shops around them.
vehicle
2020 / mercedes-benz / gls-class
known issues
7 clusters (reviewed 2026-08-30)
complaints
38 on file (2020-01-15 → 2026-06-03)
recalls
0
investigations
0
fars
2 occupant deaths, crash years 2010-2024 (legacy-code)
11736819 The engine wiring harness insulation near the ignition coil connectors prematurely deteriorated due to prolonged exposure to engine heat in the turbocharger/exhaust area. Multiple wiring connectors exhibited brittle, cracked insulation with exposed conductors. The degraded
11719907 The vehicle is experiencing deterioration of the main engine wiring harness insulation, resulting in exposed wires contacting each other. This condition has caused intermittent check engine lights and electrical fault codes. The dealership has confirmed that the wiring
11652008 I am writing to escalate an unresolved service issue with my 2020 Mercedes Benz GLS 450, VIN [XXX] . During a maintenance service on March 6, my trusted independent services shop for 25 years, Carrera Motors in San Mateo CA, identified that the electrical harness of my GLS 450
Window trim detaches from vehicle while drivingSTRUCTURE2 complaints2026-05 → 2026-05gls-2020-window-trim-detaches
11738164 Window trim on the passenger rear window fell off while driving- it put others at risk by flying off the vehicle on the interstate- Mercedes Benz of Omaha quoted replacement of the window trim parts- no warning messages on dash
11738177 The contact owns a 2020 Mercedes Benz GLS. The contact stated that while driving on the highway, the rear door window trim bars on the passenger side detached from the window. The vehicle was taken to the dealer where they diagnosed as a rear door window trim detachment however
11427911 We were driving the vehicle at about 30 MPH on a road when suddenly the engine completely shut off. There was no more power steering and no warning that it turned off. We got the car slowed down and once we came to a stop the car put itself in Park. After that we could restart
11421337 The vehicle issued a “48v battery malfunction” and the car warned me not to drive the vehicle under any circumstance. This was while driving at 55 mph on a country road. The dealer I bought the car from had 3 other cars brought in for the same issue. The dealer my car was towed
11464919 While driving, vehicle has abruptly stopped/engine turned off causing car to not accelerate and come to a stop. One instance was on a busy freeway, causing our family to pull off the interstate with nearly no curb, risking rear-end collision due to the abrupt stalling of the
Adaptive cruise or collision system brakes with no hazardFORWARD COLLISION AVOIDANCE3 complaints2024-08 → 2026-03gls-2020-phantom-braking-acc
11726166 On a sunny afternoon without zero clouds in the sky, 75 degrees I was driving at 35 mph on a two-lane road with no cars in front of me, behind me, or coming in the other direction, the brakes were urgently and automatically applied and the seat belts dramatically tightened. The
11609189 We intermittently experience phantom braking, including on the highway with no objects or vehicles ahead of us (for example, not on a curve, no vehicle visible within half a kilometer). Vehicle abruptly slows. This includes when in a lane (no lane change). It also can occur
11614077 The adaptive cruise control feature of this vehicle on various highways [XXX] , [XXX] and the [XXX] ) and in various locations while traveling at highway speeds has mis-read speed limit signs and aggressively decelerated(I assume by using its regenerative braking) to as low as
Backup camera view restricted or unavailableELECTRICAL SYSTEM, FORWARD COLLISION AVOIDANCE, BACK OVER PREVENTION3 complaints2024-07 → 2026-03gls-2020-camera-view-restricted
11600969 I have received multiple notifications over several months that read "Camera view restricted". This impacts the collision avoidance and adaptive highbeam assist functions. Dealer has offered no service recommendations
11615337 intermittent rear view camera inoperable when you shift from park to reverse. Doesnt come on even if you turn off and tune on the engine
11723015 The vehicle (2020 GLS 450) suffers from terminal infrastructure "Electronic Rot," resulting in a consistent Breach of FMVSS 111 (Rearview Visibility) and dangerous Automatic Emergency Braking hallucinations. On 03/08/2026, a routine car wash triggered multiple system failures
11435522 Upon starting the car, the screen of the 2020 Mercedes Benz GLS 450 remained blank. This includes the portion of the dashboard that reads speedometer, gas, temperature, RPM. The engine was running and truck could still be driven. The vehicle is available for inspection upon
11586461 The dashboard screen stops working randomly. This is not related to extreme outdoor temp conditions. Mercedes dealer could not reproduce the problem and therefore could not offer any solution. Problem has happened 5-6 times over the past 7 months. Please watch video below: [XXX]
11455658 MBUX Failure Customer sold MB GLS450 with all season MB Floor matts, Water on shoes drains on floor matts, car is driven and when braking water floods the underneath the front passenger seat and enters the MBUX and shuts down all electronics. This was identified as an issue with
11652075 The suspension has failed despite changing engine mounts. It is available for inspection if needed. I also believe there is Premature wear of the front struts and rear shock absorbers. This can affect vehicle handling and control, increasing the risk of a crash. There were no
11637274 The shock absorbers have prematurely failed as other recalled 2020 GLS vehicles, but our VIN is not showing under the recall campaign 20V329000. Can our vehicle be included on this recall?
FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road.
Cite this
Derived data is CC BY 4.0. Link back to the page you used. Text and BibTeX below.
Wrench.Pro (2026). 2020 Mercedes-Benz GLS-Class vehicle data [dataset]. https://www.wrench.pro/data/vehicles/2020/mercedes-benz/gls-class
@misc{wrenchpro_2020_mercedes_benz_gls_class_2026,
author = {Wrench.Pro},
title = {Wrench.Pro vehicle data: 2020 Mercedes-Benz GLS-Class},
year = {2026},
howpublished = {\url{https://www.wrench.pro/data/vehicles/2020/mercedes-benz/gls-class}},
note = {Derived from NHTSA public records. CC BY 4.0.}
}
