2021 Mercedes-Benz GLS580 Owner Complaints

The vehicle suffered a sudden, catastrophic 48V mild-hybrid electrical power supply breakdown and complete system failure while traveling at highway speeds during a cross-country move. The sudden failure forced an emergency lane change into an isolation zone just off the highway. The sudden failure left the cabin completely powerless with no operational safety systems, hazard lights, or air conditioning in extreme 100+ degree heat. This roadside isolation created an immediate physical hazard and directly inflicted acute heat exhaustion and severe dehydration, requiring a subsequent emergency clinical medical evaluation on July 5 for lingering environmental exposure symptoms. Subsequent forensic diagnostics performed at an authorized secondary dealership (Mercedes-Benz of North Scottsdale) captured digital video evidence of active, high-voltage 48V electrical arcing across a completely loose, un-torqued main grounding network connection left by a prior repair facility (Mercedes-Benz of Syracuse) during a major warranty engine removal repair just 7 days prior. Secondary dealer diagnostics officially logged this internal structural failure under factory tracking as Damage Code 5482G388. The loose connection created an active, immediate thermal and fire hazard capable of igniting nearby fuel or fluid lines. The original repairing facility deflected liability, claiming the high-voltage ground studs 'loosen due to many reasons' on an asset with no prior electrical faults. This creates a severe ongoing fire, thermal, and crash risk for this model year's 48V electrical system architecture.

NHTSA ID

11753406

Incident

Jun 30, 2026

The contact owns a 2021 Mercedes-Benz GLS580. The contact stated that after entering the vehicle, the contact became aware of an abnormally strong fuel odor inside the vehicle. There was no warning light illuminated. The vehicle was taken to two independent mechanics who referred the contact to the local dealer for assistance. The local dealer was contacted, but the vehicle was not diagnosed or repaired. The manufacturer was not contacted. The failure mileage was approximately 83,000.

NHTSA ID

11701200

Incident

Nov 16, 2025

Mileage

83,000 mi

Delivered an unfinished or car with a broken part,Seat Problem not locking properly, Electrical Problem, Engine Light Came on, ESP warning, Suspension Problem, Battery Problem, Steering Jerking, Mirror Problem which they said Mercedes Benz aware of it, some sort of sound, car getting hot excessively.

NHTSA ID

11574364

Incident

Nov 24, 2023

Continuous malfunctioning front windshield wipers. In light to medium rain/wet condition the wipers chatter/jump on the windshield, leaving residue on windshield and causing substantial distraction to driving and even discourages use of wipers (leaving visibility poor). Mercedes Dearler/Service center has attempted multiple remedies over time but to no avail. Internet search of multiple forums on the web show many people with similar issues so thought it would be relevant for NHTSA to know. Issue is ongoing.

NHTSA ID

11491095

Incident

Mar 1, 2021

The contact owns a 2021 Mercedes Benz GL550. The contact stated that while driving 30 -35 mph an unknown vehicle crossed her path, the driver depressed the brake pedal but was unable to stop before colliding with a vehicle. The steering wheel air bag split open and deployed. The contact sustained injuries, the inside of her right arm was cut. The air bags on the floor deployed and contact sustained severe burns on her shin medical attention was provided. The contact stated she still has an open wound. The distance warning indicator light was illuminated. There was no reported fire. The police were on the scene however, there was no police report filed. The vehicle was towed to an independent lot. The local dealer was contacted but the vehicle was not diagnosed. The manufacturer was contacted but, no further assistance was provided The failure mileage was approximately 3,000. The contact mentioned the floor air bag was removed by the tow company. The VIN was not available. UPDATES- Due to the impact of the airbags on the floor, it caused major bruising, restricted blood flow and two hematomas to my right shin. In August of 2020 I had major surgery to remove the hematoma and healing for this open wound took seven months. I have a major scar on my right shin. Additionally, I have a scar on the inside of my lower right arm as the airbag on the steering wheel split open and cut my arm. Steigler Automotive Repair, in Reseda, California repaired all damages to my vehicle (approximately $30,000k) and the car was released back to me.

NHTSA ID

11444154

Incident

Jul 3, 2021

Mileage

3,000 mi