Mercedes BENZ GLB Class Reliability by YearBest & worst years, problems & recalls — NHTSA data

Coordinate this complaint with previous complaints reference 11569682 and 11569502, As of last night the car has 1136 miles. I have thoroughly tested the car to the best of my ability and set and reset the settings. The hill decent has only engaged twice. The car is supposed to read speed limit signs and it does show up in the instrument panel but the car speeds up randomly i.e. from 35 to 50 and above to not limited to 35. The adaptive speed control at random will malfunction the car will not slow down and brake. This has happened several times. When turn signal is engaged and you enter turning lane the car may slow down or not. This vehicle I was told is a MBUA corporate vehicle held back at MBUSA for over 2 years then auctioned. Fletcher Jones Las Vegas had the vehicle on the lot with 47 miles and sold it to me with 48 miles. There is no maintenance or service record the driver assist system, hardware, software system was checked, calibrated, repaired or tested. Given the mileage the car was not road tested. " THIS VEHICLE IS A ROAD HAZARD WAITING FOR AN ACCIDENT TO HAPPEN" It needs to be repaired, road tested, and certified safe by MBUSA and Fletcher Jones. What is the secret and reason why MBUSA held back this car and then 2 years later auction it off? My wife nearly rearended a car that had slowed down and. The driver assist failed to slow down and stop the car. I have experienced this and other experience's listed above several times and sometimes 50% of the time and have to manually engage the brake to slow down, stop, and disengage driver assist system.

All advance driver assistance system has a 50% work fail reliability. It may work it may fail to work, I bought the cat from a Mercades Dealer in Las Vegas with 48 miles on it. The vehicle has approx 900 now. The driver assist system fails daily, it is unreliable, dangerous and a hazard to occupants and others. It needs to be inspected and repaired, recalled.

Driver assist adaptive speed control, braking, lane control all boxes checked has a 50/50 work fail that is it may work may not work. This is a safety concern that needs to be checked by MBUSA

Parked the car not far from home, when my boyfriend got out and shut the door, the sunroof completely imploded. Tempered yet sharp shards were everywhere including my mouth, hair and body. MB took no responsibility and wound even have the car towed. Roof was repaired via my car insurance including private towing. MB wanted nothing to do with me. I do know that this has been a serious problem all over the country for some time. Please advise.

According to a MB USA representative, the warning light instructing me not to drive over 50 miles per hour was related to my suspension. In addition to the warning light, I have repeatedly expressed my concerns about a loud creaking noise coming from the wheel area while driving, turning the corner, pulling in and out of driveway, etc. However, South Bay Mercedes is never able to duplicate the noise or identity the warning. I have also contacted MB USA on multiple occasions and they confirmed that I have three (3) open cases, but refuse to provide me with the case number and fail to respond as stated during each call. The suspension warning light has been coming on, intermittently, a few months after I purchased the vehicle and South Bay Mercedes only suggested a tire change and service appointments while blatantly disregarding the problem. Now I am getting a warning light that states, Service Required Do Not Shift Gears Visit Dealer. I have had this car less than a year as it was purchased brand new, and South Bay Mercedes/MB USA have been giving me the runaround for months; only corresponding to schedule upcoming service appointments. I have since changed my front tires, but continue to get warning messages. I have repeatedly expressed concerns about my safety and never received a response from MB USA.

I purchased my car in April of this year 2022 and have driven less than 10K miles. The tread of my front two tires has already worn down to less than 3/32 compared to the rear wheel 6/32. Driving conditions are normal and according to Mercedes this is known issue. This exceeds normal wear and tear and should be a safety concern.

The contact owns a 2022 Mercedes-Benz GLB250. The contact stated that upon purchase of the vehicle, he noticed a glare coming from the ridges of the hood which became distracting while driving. The contact stated that as the sun began going down, the glare worsened, forcing the contact place his hand over his eyes to deflect the glare. The manufacturer was notified of the issue and informed the contact that they had never heard of the issue before. The dealer was not notified of the issue. The vehicle was not repaired. The failure mileage was approximately 150.

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.

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.

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.

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.

Cylinder repair dealership said it's a known issue but Mercedes Benz said they will not cover the repair.