Mercedes-Benz GLB-Class Complaints (2023)

14 consumer complaints on file.

#11768998October 5, 2026
ENGINE
My 2023 Mercedes-Benz GLB 250 4MATIC, with approximately 70,000 miles, developed an intermittent Check Engine warning and began running rough and shaking during operation. The vehicle was taken to an authorized Mercedes-Benz dealership for diagnosis. The dealer confirmed a major engine problem and determined that the cylinder head assembly requires replacement. I am concerned that the failure of a major internal engine component on a vehicle of this age and mileage could create a safety risk, particularly because the vehicle was running rough and shaking while being driven and the Check Engine warning was intermittent. The vehicle is currently at the authorized Mercedes-Benz dealership and the cylinder head repair/replacement has begun. The dealer's documented diagnosis states: “Cylinder Head Assembly: Replace Cylinder Head.” I am reporting this issue because I believe NHTSA should be aware of this engine/cylinder-head failure and determine whether other 2023 Mercedes-Benz GLB 250 vehicles have experienced similar failures.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11766570September 23, 2026
STRUCTURE:BODY, SERVICE BRAKES
NHTSA Recall 26V481 (Mercedes-Benz recall no. 2026070007). Interim owner notification letter dated September 18, 2026, titled "Replace Driver Door Lock." The micro-switch in the driver door lock may corrode and fail to detect an open driver door, which can prevent the electronic parking brake or "Auto-Park" feature from engaging automatically. This may result in a vehicle rollaway, increasing the risk of a crash or injury. Mercedes-Benz states in the interim letter that the remedy is not yet available and provides no date for when parts will arrive, leaving owners driving or parking a vehicle with a known rollaway defect. No crash, fire, injury, or fatality has occurred. Request: NHTSA should monitor this recall and press Mercedes-Benz for an expedited remedy.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11739111May 20, 2026
ENGINE
Safety Risk - Twice I was almost hit because my car didn't take off. O'REILLY Veri Scan Results - Free Emissions Status: Red Primary DTC: Mixture Formation (Cylinder 4) is irregular P219F: Fuel injectors measure and atomize fuel mixed with incoming air and sent to combustion chambers. Cylinder 4 PSI at 40 Mercedes Benz of San Juan $300 diagnostic Cylinder head needs to be replaced. Safety Risk - Twice I was almost hit because my car didn't take off. Problem has been confirmed by dealer. Not inspected by manufacturer, etc. Prior to failure there were no signs. Check Engine light came on and that is when it got checked at 55, 715 miles, soon after warranty ended.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11733918April 27, 2026
ENGINE, FUEL/PROPULSION SYSTEM, POWER TRAIN
My 2023 Mercedes-Benz GLB 250 is experiencing engine misfires and fault codes consistent with a known cylinder head defect that is the subject of a recall affecting 2022 and earlier models. A certified mechanic has confirmed the issue aligns with the recall defect. Despite identical symptoms and engine configuration, my VIN is excluded. The condition results in loss of power and creates a potential safety hazard while driving. The following codes are referenced in the Mercedes recall and by recorded by the auto repair shop that provided an estimate for the repair: P1CEF85 - Injector injection quantity adjustment for cylinder balancing has almost reached the upper limit value at atleast one cylinder. P1CE577 - Injector injection quantity adjustment for uniform mixture formation has detected an excessively lean mixture at atleast one cylinder.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11733638April 24, 2026
UNKNOWN OR OTHER
Reporting because I see reports on other searches of this happening on other Mercedes Benz various years and models, the front stationary roof panel has shattered, cracked. I was lucky, my vehicle is only cracked (leaving my windshield components open to the weather , ie rain in Washington). Others report shattering while driving and having injuries from blowing glass. This appears to be an ongoing problem with Mercedes, they want over $2000 to fix a common problem with their vehicles.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11720803February 26, 2026
ENGINE
On December 19, 2025, the vehicle showed lights that a sparkplug had misfired. The dealer notified me that in less than two full years of having the 2023 vehicle, it required a complete engine rebuild. This is the third major engine problem I have had with the vehicle with more than $20K in fees. The services performed in December 2025 repairs included Cylinder Head Assembly to Replace Engine Cylinder Head Assemble due to multiple cylinder head fault codes, including misfire, injector injection, and mixture formation code. Cylinder 2 is leaking out of the exhaust valve. Camshaft replacement and rollers due to deep scoring on both intake and exhaust cams, not by cylinder two. Exhaust valve leaking from the head while the camshafts are scoring, leading to misfiring as well.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11698759November 11, 2025
ENGINE
Cylinder repair dealership said it's a known issue but Mercedes Benz said they will not cover the repair.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11686651September 11, 2025
VISIBILITY/WIPER
I was driving on Highway on May 19th and the Panoramic Sunroof suddenly shattered
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
#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
#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
#11633630January 2, 2025
UNKNOWN OR OTHER
Transmission switching to neutral by itself while driving on the highway. This issue has occurred twice in December 2024.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11572169February 15, 2024
SERVICE BRAKES, POWER TRAIN
The contact owned a 2023 Mercedes-Benz GLB35 AMG. The contact stated that while driving at an undisclosed speed, the brakes were inoperable. The contact stated that while depressing the brake pedal, the vehicle was not braking smoothly. Additionally, the vehicle failed to accelerate as intended. The contact stated that the transmission malfunction warning light was illuminated. The contact stated that the vehicle had been taken to the dealer four times. The contact stated that the first visit with the dealer regarding the brakes, the dealer applied lubricant to the brake pedal. The contact stated that the failure was persistent. The vehicle was taken to the dealer for the second and third time, however the failure could not be duplicated. The contact stated that the failure was persistent. The vehicle was taken back to the dealer for the fourth time, and the vehicle was sold back to the dealer. The vehicle was not diagnosed or repaired by an independent mechanic or dealer. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 3,200.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0

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