Mercedes-Benz GLB-Class Complaints

136 consumer complaints on file.

#11684397September 2, 2025
UNKNOWN OR OTHER
While driving, the panoramic moonroof on my 2021 Mercedes-Benz GLB 250 (VIN: [XXX] ) suddenly shattered without any visible impact or prior damage. It sounded like an explosion, and glass rained down into the vehicle. This could have caused serious injury to myself or my child. There was no indication that a rock or debris hit the vehicle. No vehicles were in front of me, and I have no history of impact damage. This seems to have happened spontaneously, and after researching the issue, I found it is a common problem across various Mercedes-Benz models. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11681871August 20, 2025
FUEL/PROPULSION SYSTEM, POWER TRAIN
My fuel injection has been replaced 2 times in 3 years. Was advised that it could cause damages to other parts
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11680547August 14, 2025
SERVICE BRAKES, FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING
Brake over heats because of rust caused by rain which builds up causing brakes to freeze up. Explanation from dealer. In fact told us we need to dry brakes off if we drive in rain and park in garage for more than 2 days or we will have it happen again. Brakes freeze and car locked up and can’t move it. We bought the car used had it inspected by a MBD in Atlanta G. Bulkhead , told breaks were like new. Mileage 23,666 miles. Put on about 4000 miles now brakes gone froze up from rain. Garage kept. While driving car we were noticing almost like the breakers were on but not stepping on break. A pulling like action. Seemed like emergency brake was on. Car at dealership now in Greenville SC Mercedes Benz dealer.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11678410August 5, 2025
STRUCTURE:BODY
I am submitting this formal complaint regarding a serious safety incident involving my 2020 Mercedes-Benz GLB, which directly reflects the defect outlined in Recall 20V-480 (Rear Spoiler Detachment). Although my VIN is not officially included in the affected range, the exact failure described in the recall occurred on my vehicle. On or about June 16, 2025, at approximately 3:00 p.m., I was driving and I noticed an object in my rearview mirror that had become airborne and was causing vehicles behind me to swerve to avoid it. Moments later, two separate vehicles pulled up alongside me, and the drivers began waving their arms to get my attention. I exited the roadway and pulled into the Walmart parking lot, where a couple in a pickup truck approached me and informed me that the rear spoiler of my vehicle had flown off. I got out to inspect the vehicle, and indeed, the spoiler was completely gone. I returned to the area where I first saw the airborne object, attempting to locate the detached part, but was unsuccessful in recovering it. I contacted Mercedes-Benz USA and my local dealership on June 17, 2025, and was told that because my vehicle’s VIN is not listed under the recall, I would be responsible for the full cost of inspection and repair. Frankly, that position is unacceptable for the following reasons: - Recall 20V-480 describes a defect involving improperly welded rear spoilers on 2020 GLB250 models, which can detach while driving. That is exactly what happened to my vehicle under normal conditions. - The spoiler detached while the vehicle was in motion, creating a dangerous road hazard—just as outlined in the recall. - The vehicle has never been involved in a collision or sustained rear-end damage. It has not been subjected to outside interference. - My VIN has been included in at least five previous recalls, underscoring that my vehicle was part of broader quality issues during that production period.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11676547July 28, 2025
ELECTRICAL SYSTEM
Rear Camera malfunction The flap of the reversing camera opens and closes by itself during forward travel, making a loud thumb noise every time the car slows down to an intersection. No camera image is displayed in the head unit. This is a driving distraction for the operator and thus a safety issue as the sound is loud and its made constantly at every stop when you slow down. Dealer was able to reproduce and said this was normal behavior. Recommended disabling the Parktronic driving assistance feature to not engage sensors, but this in itself would be inactivating an important safety feature. This problem is widely reported online.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11672721July 11, 2025
Carry Handle, Shell, Base, Other/I am not sure
Graco Turn2Me car seat is loosening over time when installed with the vehicle seatbelt and the SnugLock Lock-Off. The vehicle seat belt was also switched to a locked mode after proper installation and did not make a difference over time. The car seat continues to loosen over time to the point where it is moving more than an inch side to side at the belt path. This can cause injury to a child during a crash. Car seat has been installed with the assistance of certified Child Passenger Safety Technicians and Instructors on multiple occasions.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11672392July 10, 2025
STRUCTURE:BODY
See attached document for complaint.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668913June 24, 2025
EXTERIOR LIGHTING, ELECTRICAL SYSTEM, SUSPENSION
Despite maintaining the vehicle according to the recommended schedule, I have encountered ongoing performance issues (electrical, rear shocks, fan motor etc.) that are not in line with the standard of quality I expect from a brand of your reputation. Window not going down all the way on the driver side. Radio not working but was fixed. These issues have caused inconvenience and concern regarding the reliability of the vehicle. To address my concerns, I spoke with a Mercedes-Benz representative who informed me that, due to the problems I’ve experienced, I may be eligible for either an extended warranty or a credit toward the purchase of a new vehicle. After careful consideration, I opted for the extended warranty. However, I was later informed that this option had not been approved—despite it initially being presented as available. This contradiction is both confusing and frustrating, and it has significantly diminished my confidence in the customer service process.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11668223June 20, 2025
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
In April 2025, my 2021 Mercedes-Benz GLB 250 (81,000 miles) suffered repeated engine issues caused by a cylinder head failure. The dealer attempted a cylinder head replacement, but during their own test drive after repairs, the engine completely seized and failed again on their property. This indicates a severe defect in the engine assembly that risks sudden power loss while driving, which could cause an accident. Prior to the failure, there were warning messages about misfires and rough idle. The problem has been confirmed by an authorized Mercedes-Benz dealer and the car has been kept at their shop since April, with no resolution. I am concerned this is a recurring safety defect affecting other GLB 250 vehicles. The vehicle is available for inspection and remains undriveable due to the failed engine. I request NHTSA to investigate for possible safety-related design or manufacturing defects that could cause sudden engine seizure and loss of power while driving.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667631June 18, 2025
POWER TRAIN, SUSPENSION
The contact owns a 2021 Mercedes-Benz AMG GLB35. The contact stated that while reversing down the driveway at approximately 4 MPH, the contact turned the steering wheel to the left and the vehicle started losing motive power. The contact stated that the RPMs were extremely high and the vehicle almost stalled. The contact stated no warning light was illuminated. The contact stated that the failure was intermittent and occurred at slower speeds between 3 and 6 MPH. The contact had taken the vehicle to a local dealer, where it was diagnosed and determined that the driver's side front axle had failed and needed to be replaced. The vehicle was not repaired. The contact researched online and related the failure to a manufacturer's recall for replacing the front axle integral carrier. The manufacturer was informed of the failure and advised the contact that the vehicle was not included in the manufacturer's recall selection. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 55,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11667787June 18, 2025
VISIBILITY:WINDSHIELD WIPER/WASHER
The windshield washer stopped working It doesn’t clean because no water comes out to do the job
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11666248June 11, 2025
SEAT BELTS
Seat belt failure.Driver side…mechanism… it feels unsafe…the retractor is not locking
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11665355June 6, 2025
ENGINE, UNKNOWN OR OTHER
Jerking and loud noise from the engine after attempting to accelerate from a red light stop. Vehicle is idling very roughly and almost sounds like a diesel engine. Check engine light came on. Inspection at the dealership found multiple faults for camshaft positions deviating from the specified value. When the oil filter was removed, the shop reported finding some metal particles in the oil. The conclusion was that a mechanical fault caused a metal part in the engine to brake and clog up the engine. The car did not run smoothly after the jerking sound and could have caused an accident if the car was in active motion. The recommendation now is that the engine needs to be replaced.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11661522May 16, 2025
SERVICE BRAKES, HYDRAULIC, EQUIPMENT
The contact owns a 2020 Mercedes-Benz GLB250. The contact received notification of NHTSA Campaign Number: 23V732000 (Service Brakes, Hydraulic, Equipment); however, the part to do the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The dealer was made aware of the issue and confirmed that parts were not yet available. The manufacturer was made aware of the issue and confirmed that parts were not yet available. The contact had not experienced a failure. VIN tool confirms parts not available.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11660562May 12, 2025
ENGINE
On 4/13/25 while driving my car on the highway, along with my 2 young children, I began to hear what initally sounded like a "flapping" noise. I rolled the windows down and after a minute or 2 the sound got lounder. There was never a warning or any type of safety icon that appeared on the control panel, nor any driving performance issue before hand. Shortly after the initial noise I could tell the car was struggling to accelerate. I wasn't near an exit during this time and began to panic in fear the car would shut down and I had no safe place to pull over on that stretch of highway. The noise turned into a banging within another min or so and I finally noticed an exit up ahead. Almost immediately as I excited the highway, the car completely shut down with me having practically no control of the steering wheel and unable to put the car into neutral. I coasted to the stop sign at the end of the exit ramp. The car would not restart after 2 attempts, I stepped out to see a massive amount of oil coming from under the car. The car recently had the 4th cylinder head replaced in Jan 2025 and was in the shop for almost 1 month. I was assured the engine was safe to drive after that repair. It has remained unserviced at the dealership since 4/13/25 and was informed it has catastrophic engine failure due to a thrown rod with Cylinder 2 being the "source of the failure." The dealership has quoted a $28k+ repair bill and Mercedes corporate has refused to replace it with a "goodwill" gesture. Only offering $1,500 toward repairs and no reimbursement for any of the 4 rental cars Ive obtained since my vehicle has been inoperable. I was not informed at the time of my purchase about any defects on the M260 engines faulty cylinder head & Mercedes extending a warrenty due to such. They are refusing to accept liability for the cacade of damage & ultimate engine failure steming from now cylinder 2. This event risked the lives of my children's and myself due to Mercedes negligence.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11656155April 22, 2025
POWER TRAIN
The contact owns a 2023 Mercedes-Benz GLB250. The contact stated that while driving at an undisclosed speed, the vehicle lost motive power with the transmission warning light illuminated. The vehicle was towed to the dealer but was not diagnosed or repaired. Additionally, the contact stated that while driving at an undisclosed speed, the vehicle shuddered abnormally. There was no warning light illuminated. The manufacturer was made aware of the failure. The approximate failure mileage was 18,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11655463April 18, 2025
SERVICE BRAKES
The front brakes making noise when slow stop , Merced dealer service repair 3 time and replace rotor and brakes, but the problem still making noise. they said nothing he can do. want me to report NHTSA. thanks
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11652993April 6, 2025
SUSPENSION
Front and rear suspension/control arms appears to have squeaky noises when approaching a turn or going a speed bump.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11638919January 27, 2025
SERVICE BRAKES, HYDRAULIC
The contact owned a 2021 Mercedes-Benz GLB35. The contact stated while driving at 35 MPH, the brake pedal was depressed; however, the vehicle failed to stop as intended. There was no warning light illuminated. The contact stated that neither the dealer nor an independent mechanic was contacted. The vehicle was not diagnosed or repaired. The contact stated that the vehicle was serviced months before the failure. The manufacturer was not made aware of the failure. The failure mileage was approximately 52,000.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11634342January 6, 2025
UNKNOWN OR OTHER, FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL
1. Transmission Problem Vehicle Rolls backwards when the gear / transmission is in "Drive". It happens in these two situations: a) I am stopped at a Traffic Light which is Red. The road is at a moderate upward incline. When the Light turns Green, and I move my foot from the Break pedal to the Accelerator to move forward, the GLB rolls backwards even though the transmission is, and has been, in "Drive". b) I am backing out of my garage. Our driveway is at a moderate Backward / Downward Decline. As I reach the point where I shift the gear into "Drive", the car still continues to roll backwards. This is despite the fact that I had to depress the Brake pedal to place the vehicle in Drive. c) I have checked the settings and confirmed that the transmission is NOT in manual mode. The problem is happening when the Transmission is in automatic mode. I have been cautious and prevented an accident over the last 6 months that I have owned this car. ___________________________________ 2. Cruise Control: This is a situation is that I am driving, and I have the Cruise Control "On". I encounter the traffic to be slowing, so I push the "Cancel" button for the Cruise Control in the left bar of the steering wheel. As I manipulate the wheel to make a left turn, the "Resume" button, also in the left bar of the steering wheel, gets touched without my realization. The GLB zooms ahead violently! This is dangerous and unexpected acceleration. A corollary to this malady is that the radio suddenly blasts loud as I manipulate the steering wheel to make a right turn. The radio volume button in the bar of the steering wheel gets touched without my realization. This is dangerous. It can make the Driver jump and react suddenly to the unexpected loud noise. I REPORTED THESE 2 PROBLEMS TO MERCEDES BENZ OF NORTH AMERICA THROUGH THE WEBSITE IN DETAIL AS ABOVE ON DEC 9, 2024 THE SITE PROMISES A RESPONSE IN 24 HOURS. I HAVE NO RESPONSE
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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