Mercedes-Benz GLB-Class Complaints

136 consumer complaints on file.

#11735064May 1, 2026
AIR BAGS, ENGINE, FUEL/PROPULSION SYSTEM
I have a passenger malfunction with airbags warning coming. I also just experienced getting gas. My milage counted down to zero which it never has before and my engine light came on. I went and got gas 3 times spending around $70 and my gas mileage still says 0 and my engine light is on.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734501April 29, 2026
UNKNOWN OR OTHER
Family and I were driving on the interstate and heard a loud bang (like a shotgun) followed by immediate glass everywhere. The panoramic sunroof exploded. We had to drive 4 hours like this - lucky we didn’t jerk the wheel on the interstate with the noise. Absolutely sickening that this is so prevalent and Mercedes won’t do anything about it.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11734342April 28, 2026
AIR BAGS
my car has only 24533 miles and Air bag malfunction message is showing up
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
#11727263March 26, 2026
UNKNOWN OR OTHER, VEHICLE SPEED CONTROL
When driving on the highway going 65mph the car slipped in neutral and error showed on dashboard "transmission malfunction stop." I could steer and break, but not accelerate. Pulling over on side of highway, I was able to put in park and then drive. I pulled off the exit and the car did the same thing within 10 mins. Car was towed to Mercedes dealership in Warwick, RI. I was made aware after inspection that there was nothing wrong with the vehicle nor the transmission, but rather there was a needed software update that was causing the issue that had been identified previously. Regular service was due, but no indication whatsoever of the error I saw nor any other error codes. No error showed up for the technicians in inspecting the car. I was further informed, after research, that the software update was being drafted and that it would have to pass NHTSA governance. So I'd like to know if this is accurate? If NHTSA is aware? If the software update is sitting with you for approval? What is Mercedes obligation to share this with drivers noting they were aware of issue? If my [XXX] was driving she could have been killed. If I was accelerating on the highway or turning in front of a vehicle legally, I could have been killed. Thank you. 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
#11726066March 21, 2026
ENGINE, FUEL/PROPULSION SYSTEM
Diagnostics performed and found electrical/component fault and possible wire damage to fuel pump. NECC to drain tank and inspect replace fule pump if necc. Oringally took one week prior and diagnostics led to the possiblility that the cylinder head was malfunctioning, which was a manufacturing defect and covered under an extended warranty, but now advised otherwise. Quote $2200.00. Mileage on vehicle 23,660.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11721700March 3, 2026
ENGINE, UNKNOWN OR OTHER
When my car sits in the rain for long periods of time, while driving, it will automatically switch into neutral and give me a "transmission malfunction stop" & "service required do not shift gears visit dealer" sign on the dash. This has happened at least 7 times in 2 years since March 2024. The latest time it happened was last week. I will get into my car after a day at work, when it has been raining, drive a few miles and the car will switch into neutral and display those signs. This is incredibly dangerous for my safety as the driver, any passengers and any other cars on the road. While going 55+ miles an hour, my car, without any warning shifts into neutral. I have taken it to my local dealership for inspection every time that it happens and they have repeatedly told me they cannot find a fix for it and do not know why it is happening besides a electrical problem due to water. They advised me to file a claim with corporate Mercedes but that was denied. I have photos and documentation from the dealership of when I have brought it in for inspection and they have confirmed the issue. They will not help with a solution for this problem. They have told me to pull over, turn the car on and back off to get it to go away but it continues to do the same repeated problem.
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
#11719310February 20, 2026
STEERING, UNKNOWN OR OTHER, SUSPENSION
The component that appears to have malfunctioned is the front axle integral carrier (front subframe) and the related front suspension geometry, as the vehicle now exhibits a persistent pull to the left and degraded steering stability after the dealer replaced the front lower control arms, engine mounts, and performed alignments; this area of the vehicle is fully available for inspection upon request. My safety and the safety of others were put at risk because the vehicle requires constant steering correction to avoid drifting left, creating a danger of unintended lane departure and loss of control, which aligns with the steering‑related risks described in NHTSA Recall 21V990 / MBUSA 2022070009, where failure of the integral carrier can impair steering and increase crash risk. The problem has been reproduced by me on every drive, though the dealer stated they “did not find anything,” despite alignment printouts showing front camber imbalance and lack of caster correction. The vehicle has been inspected twice by the authorized Mercedes‑Benz dealer, but they did not inspect or address the front axle integral carrier even though the recall documentation shows that corrosion or structural issues in this part can affect steering performance and connection to other components. There were no warning lamps or dashboard alerts; the symptoms began immediately after the dealer’s suspension and mount repairs, and the steering pull and unstable handling have continued ever since.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11717145February 10, 2026
ENGINE, UNKNOWN OR OTHER
The vehicle was operating normally the previous night. We drove it and parked it in the driveway that evening, and it was not used again after that. The following morning, we started the vehicle to allow it to warm up and then returned inside the house. Approximately 10 minutes later, we discovered the vehicle was on fire, with flames coming from under the hood. We immediately called 911. The fire department responded and was able to extinguish the fire; however, the vehicle was completely destroyed, and part of our home sustained fire damage. There were no prior issues with the vehicle. We had purchased it in September 2025, and it was in excellent condition. This incident could have resulted in far more serious consequences had it occurred while the vehicle was in motion or if emergency responders had not arrived as quickly as they did.
Crash:
No
Fire:
Yes
Injuries:
0
Deaths:
0
#11708509January 3, 2026
SERVICE BRAKES, POWER TRAIN, WHEELS
I purchased this vehicle in May 28 2025. I certified car. I took in for oil change Nov 17-2025. Found out they had lot of issues., left front bushing arm leaking. Rt engine mount leaking. Bad brakes battery low. Bad tire rt back passage side.front wheel axle and rear wheel axle is bad and screw on the engine mount is missing. Screw and leaking..?and the vehicle needed a alignment.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11704654December 12, 2025
POWER TRAIN
IT APPEARS AS IF THERE IS AN ISSUE WITH THE TRANSMISSION. IN THIS VEHICLE. WHEN YOU COME TO A STOP THE TRANSMISSION HAS A LOUD CLUNKING NOISE COMING FROM LEFT SIDE OF VEHICLE. THE CLUNKING OCCURS WHEN THE VEHICLE DOWNSHIFTS. IT CLUNKS FROM D4 TO D3, THEN D3 TO D2 , AND AGAIN AT D2 TO D1. I HAVE TAKEN IT TO THE DEALER NUMEROUS TIMES TO HAVE IT CHECKED. THE SERVICE MGR WENY FOR S TEST DRIVE WITH ME AND HEARD IT. I WAS THEN TOLD THE CLUNKING WAS " NORMAL" . I PURCHASED THE VEHICLE AS A CERTIFIED USED VEHICLE FROM THE SAME DEALER . THIS HAS BEEN OCCURING SINCE PURCHASE IN MAY 2024
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11704669December 12, 2025
ENGINE, FUEL/PROPULSION SYSTEM
Engine locked up while driving out of state on the interstate. Vehicle lost all power and engine stopped functioning. Managed to pull over and stop the vehicle on the side of the interstate. Had truck towed to repair shop where they diagnosed connecting rod/crankshaft bearing failure, as well as lifter and cylinder misfire/failure on cylinder 7. Metal shavings were discovered in the oil, and engine locked up and cannot be repaired. I am currently in the process of having the engine replaced, but yes currently an inspection can still be performed, and I can provide statements and diagnostics from the mechanic. This failure put myself and my family in a scary situation. The engine was shaking violently before it stopped functioning and this made the truck very difficult to steer, not to mention this was during rush hour and we were in heavy traffic moving at speeds of 70mph+. Luckily we managed to get off the road, and to a safer location, but this left us stranded on the side of the road for 2 hours waiting on a tow. The vehicle was inspected by a GMC dealership initially where they only diagnosed lifter and cylinder misfire/failure. Due to the price of their quote to repair that issue, I took the vehicle to a certified mechanic, and thats when we found there was also connecting rod/crankshaft bearing failure prior to repairing the lifter/cylinder misfire. There were no prior warnings to this happening. No check engine lights, no noises, and no noticeable changes in the vehicle. Everything seemed to be operating normally.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11704359December 10, 2025
VISIBILITY/WIPER
Driving on north bound of Merritt Parkway between exit 17 and 18. Today 12/10/25 9:28 AM My panoramic sunroof exploded ! all catch on video, driver on the vehicle behind me , came to check on me; and told me the glass went over four feet up in the air and then hit his vehicle windshield, I call Mercedes Benz customer service support to report the incident and open a case, they told me to drive to the closest dealer from the incident (Mercedes Benz of Fairfield) when I arrived and show the vehicle to the technician, he was trying to tell me that was my fault and he never heard such a thing of a sunroof explosion… and was looking for a reason to blame me, I told him I got all on video due to I have a dash camera that records the our side and the inside of the vehicle.. the outside temperature was 30 degrees Fahrenheit, and the inside temperature in the vehicle was set to 69 degrees… My speed was 55 to 56 miles per hour. Light to moderate traffic, the explosion sound like a gunshot, that was my first impression, some one shoot at me… The dealer, told me that I should call my insurance or Mercedes Benz and the only think they can do, is to tell me how much will cost to repair the damage.. and that they will park my car on a different building so don’t get rain on it, until I decided what I want to do.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11702151November 30, 2025
ENGINE
Engine showed signs of loss of power and excess noise. It was taken to dealership via MB roadside assistance. At the dealership, they diagnosed it with engine catastrophic failure due to metal parts found in the oil filter. At no time was the engine disassembled to ensure known defects and still under warranty parts were not the cause. Dealer estimated the repair to cost in excess of $22K. MBUSA was contacted and they made no efforts to make the situation whole. The cost estimated was for the complete engine replacement. An engine that only has 53k miles. Although all routine maintenance have been conducted, engine failure was certainly pre-mature. Issues exhibited were excessive engine vibration, loss of power and excess noise.
Crash:
No
Fire:
No
Injuries:
0
Deaths:
0
#11701110November 23, 2025
STEERING, SUSPENSION, UNKNOWN OR OTHER
Escalating Safety Concern – Loud Clunking, Thumping, and Cracking from Front Axle at Low Speeds We are long-time loyal customers and currently own four identical Mercedes-Benz models. Unfortunately, one of our vehicles, a 2021 mb glb250 has recently developed severe clunking, thumping, and loud cracking noises originating from the front axle area, noticeable especially at low speeds. The problem appeared suddenly and is rapidly worsening. After researching the issue, we’ve discovered that many owners of the exact same model and model year report identical symptoms. This appears to be a widespread and recurring problem that raises serious safety concerns, particularly as it affects the front axle and is uncommon in other modern vehicles of this class and young age. Given the potential safety implications and the growing number of affected owners, we respectfully request that Mercedes-Benz investigate this issue promptly, acknowledge it as a known concern, and provide an appropriate inspection and repair at no cost to us. We love the brand and have always trusted its engineering and safety standards, which makes this experience especially distressing. We would greatly appreciate your immediate attention and a clear response on next steps.
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
#11691394October 4, 2025
ENGINE
Exhaust temperature sensor or harness messed up by 8k miles just bought car with only 2k miles already in the shop 2 times
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

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