2021 Mercedes-Benz AMG GLB35

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.

NHTSA ID

11667631

Incident

Jun 2, 2025

Mileage

55,000 mi

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.

NHTSA ID

11660562

Incident

Apr 13, 2025

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.

NHTSA ID

11638919

Incident

Jan 16, 2025

Mileage

52,000 mi

I was driving home on a residential street at approximately 30 MPH. I heard a loud pop or bang sound coming from the top middle area of my windshield. I checked for any windshield damage, observed none. I thought the whole noise strange as nothing had hit my car or windshield. A couple days later I noticed that the glass panel between the windshield and sunroof, was completely shattered, with a horizontal crack running across the panel. I also noticed that the framing between the panel and windshield was not right. It sort of was "popped" outward. There was no warning regarding this failure. I had hand washed the vehicle 3 days prior and everything looked fine. I have had conversations with my local dealer regarding this issue and so far, am getting considerable push back, that this is my problem. Even though this problem seems very similar to the once experienced by the MB 2017-2020 C class, where this panel failed, and the sunroofs blew off. I am taking the car in to the dealer today for them to look at.

NHTSA ID

11516008

Incident

Apr 4, 2023

The contact owns a 2021 Mercedes-Benz AMG GLB35. The contact stated he became aware that 3 out of 4 of the wheel-hub caps were missing. The contact called the local dealer and made them aware of the failure. The vehicle was not diagnosed or repaired. Upon investigation, the contact associated the failure with NHTSA Campaign Number: 20V800000 (Wheels) however, the VIN was not included. The manufacturer had not been informed of the failure. The failure mileage was approximately 22,000. Consumer is still waiting for trim replacement.

NHTSA ID

11440675

Incident

Nov 7, 2021

Mileage

22,000 mi

Complaint • While driving, engine speed may increase with accelerator pedal input while vehicle acceleration remains limited with no torque transfer to the wheels • 4th gear may remain displayed in the instrument cluster after the condition occurs, including when the vehicle has come to a standstill. • Cycling the ignition may restore normal transmission operation. • No related fault code or warning message may be stored. Cause During extended periods of steady driving in 4th gear, a preventative flushing routine of the Mux2P valve may be performed in the transmission valve body. If 3rd gear is requested shortly afterward, the pressure within the Mux2P oil channel may not yet have fully reduced. Under these conditions, the transmission control unit may detect an implausible shift actuator movement. As a protective measure, the transmission control unit may temporarily shift the transmission into neutral. As a result, 4th gear may continue to be displayed in the instrument cluster even after the vehicle has come to a standstill. Remedy Please perform the following: 1. Update software TCM8FDCT_PT4 transmission control unit

Complaint • While driving, engine speed may increase with accelerator pedal input while vehicle acceleration remains limited with no torque transfer to the wheels • 4th gear may remain displayed in the instrument cluster after the condition occurs, including when the vehicle has come to a standstill. • Cycling the ignition may restore normal transmission operation. • No related fault code or warning message may be stored. Cause During extended periods of steady driving in 4th gear, a preventative flushing routine of the Mux2P valve may be performed in the transmission valve body. If 3rd gear is requested shortly afterward, the pressure within the Mux2P oil channel may not yet have fully reduced. Under these conditions, the transmission control unit may detect an implausible shift actuator movement. As a protective measure, the transmission control unit may temporarily shift the transmission into neutral. As a result, 4th gear may continue to be displayed in the instrument cluster even after the vehicle has come to a standstill. Remedy Please perform the following: 1. Update software TCM8FDCT_PT4 transmission control unit

Complaint Slight creaking noises when steering. Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the horn contact plate and check the sleeves for noise; see attached video. If necessary, apply lubricant to the sleeves.

Complaint Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. Cause Although the cause of the vibration is most likely due to excessive lateral runout on the rotor or hub/wheel bearing, the system as a whole needs to be checked for other possible contributors. 1. Prior collision damage. 2. Excessive vehicle sitting times without rotating components. 3. Wheel bearing/hub lateral runout. 4. Wheel mating interface has been overtightened (did not follow WIS torque procedures). 5. Mating interfaces have been excessively modified (painted, gouged, bent, etc...). Remedy Read through the entire attached worksheet prior to performing. After performing, please review the final page and perform work accordingly. NOTE: This document is not pre‑authorization or otherwise dealing with warranty. This is intended for diagnostic purposes only. If there are any questions on how to proceed OR The work sheet has been performed and the vehicle has returned with the same concern. Please perform the measurements as seen in the worksheet again and open a TIPS case to the Body, Chassis, and Entertainment team.

Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of updating to the new one. Cause When a new station change request is triggered, a temporary glitch is causing the Head Unit application to fail to overwrite the previous request. This glitch is causing the cover art mismatch in the Radio application. Remedy Please do not replace any parts. Please update the Head unit software to E505.9

Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary, create a TIPS case with an informative video as an attachment. Note: Please refer to this document in the warranty claim and, once diagnosis is completed, select the damage code depending on the component part that is causing the issue. • If the noise stops when the door trim is removed, please proceed in accordance with LI72.10‑P‑067691. Information: In this case, do not use a damage code for the speakers in the warranty claim!