2019 Mercedes-Benz GLC-Class

The contact owns a 2019 Mercedes-Benz GLC300. The contact stated that while driving 65 MPH on the interstate, the sunroof suddenly shattered into pieces and flew off the vehicle. The vehicle was driven to a dealer but was not repaired. The manufacturer was notified of the failure. The failure mileage was 106,706.

I have a MC Benz 300 GLC with $50,000 miles. I was having heating issues so took it to the dealership, which basically advised of the issue describer below, which would cost $14k to repair. Contaminated coolant in Mercedes-Benz GLC 300 models often results from the internal failure of a "desiccant bag" inside the coolant expansion tank, which disintegrates, releasing material that clogs the heater core. Symptoms include black residue in the tank, reduced cabin heat, and engine overheating. Key actions include replacing the expansion tank (reservoir) and flushing the entire system.

SUNROOF EXPLODED AND SHATTERED. I HEARD IT WHILE DRIVING AND HELD ON TIGHTLY TO THE STEERING WHEEL BEFORE I REALIZED WHAT IT WAS. THE DEALER AND MY AUTO INSURANCE HAVE BEEN CALLED, NEITHER PICKED UP, AND I LEFT EACH A VOICE MAIL MESSAGE. NO WARNING LAMPS, MESSAGES OR OTHER SYMPTOMS OF THE PROBLEM OCCURRED.

My sunroof just exploded while driving on the highway without any impact or warning. It was a clear sunny day. There wasn't a vehicle in front of me. Nothing fell on my windshield nor sunroof. The sudden explosion and shattering of the glass was extremely startling. I had a mesh underneath the sunroof that contained some of the shattered glass so it did not fall on me while I was driving. I'm so thankful there wasn't a car behind me for the glass debris to fall on. Mercedes USA was not helpful, unresponsive for many weeks. They eventually declined repair coverage due to out of warranty, not manufacture defect nor safety issue.

Engine runs rough and activates a flashing engine light. Sounds like the engine is misfiring. On two occasions the engine stalled,(no power steering, brakes...) luckily not in a dangerous situation. No engine codes were visible to a technician when try to diagnose. Car seemed to run fine again after restart.

The contact owned a 2019 Mercedes-Benz GLC 300. The contact stated that while driving at 15 MPH up and down the street on the fourth trip, the vehicle pulled to the left and suddenly accelerated, traveled over the curb, went through a sign on a pole, vegetation, and crashed into a concrete planter box. There were no warning lights illuminated. The air bag deployed. The contact sustained bruises on her knees and hands. Medical attention was provided at the hospital. The paramedics, the police department, and the fire department were on the scene. The paramedics checked her out at the scene. There were no reported fires. A police report was filed. The vehicle was towed to a tow lot. The local dealer was not contacted. The vehicle was not diagnosed or repaired. The contact was working with her insurance company to obtain the black box. The vehicle was deemed a total loss by the insurance company. The manufacturer was not contacted. The failure mileage was 48,000.

I was driving on a street 5mph and all of a sudden my car surged and led me to curb where i knocked hit a steer din and it veered onto someone’s lawn and hit a huge planter and stopped . Air bags were deployed . I had no control over the car . EDR was preformed and I’m sure it was a throttle surge issue and cause unintended acceleration . The edr shows I was going 5 miles an hour but then says pedal was pushed to 100%. While traveling at approximately 4–5 mph during a low-speed maneuver, with light accelerator input, the vehicle unexpectedly surged forward. I did not intend to accelerate. The vehicle rapidly increased speed, left the roadway, struck a street sign and a planter, and the airbags deployed. Event Data Recorder (EDR) data retrieved by the insurer (Mercury Insurance) shows the vehicle traveling at low speed immediately prior to the event, followed by a recorded 100% accelerator pedal position. This data does not reflect my driving intent and appears inconsistent with the low-speed conditions. The EDR documentation notes that accelerator pedal position is sampled asynchronously and reflects values transmitted to the SRS Control Module, not continuous pedal input or driver intent. No brake input was recorded prior to the impact. The sudden acceleration occurred too quickly to react. Mercedes-Benz inspected the vehicle and released only the EDR data, declining to provide further clarification regarding throttle control logic, pedal sensor correlation, or torque command behavior. I am reporting this incident due to concern that low-speed throttle control behavior, software logic, or transmission engagement may result in unintended acceleration without corresponding driver intent, posing a safety risk during parking-lot or low-speed driving conditions.

While driving on Route 95 the Front Stationary Sunroof Panel separated and flew off

The contact owns a 2019 Mercedes-Benz GLC 300. The contact stated that while driving 60 MPH, there was an abnormal cracking sound coming from the roof. The contact stated that upon arriving to the destination and parking the vehicle, the contact became aware that the panoramic roof panel had detached. The dealer was notified of the failure. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Numbers: 23V854000 (Structure) and 21V197000 (Structure). The manufacturer was notified of the failure and informed the contact that the VIN was not included in the recalls, and assistance could not be provided because the vehicle was out of warranty. The failure mileage was approximately 30,000.

- My transmission is malfunctioning. It is available for inspection. - My car is not allowing me to shift from reverse to drive. When I try to put it in drive, it gets stuck in neutral. My safety is at risk as I was trying to do a quick 3-point turn and got stuck in the lane. - Yes, the problem has been confirmed by an independent service center. There was a recall by Mercedes Benz for the same issue in 2020, but for some reason my car isn't included. - The vehicle has been inspected by an independent service center - No warning lamps or messaged prior to the failure which first appeared on Thursday, June 5.

FIRE! NHTSA Vehicle Safety Complaint – Mercedes-Benz GLC300 Complainant Information: [XXX] [XXX] Phone: [XXX] Email: [XXX] Vehicle Information: 2019 Mercedes-Benz GLC300 4MATIC VIN: [XXX] Purchase Location: Missouri Incident Location: St. Louis, MO Date of Incident: [XXX] Date of Report Submission: July 12, 2025 Summary of Incident: On [XXX] , my 2019 Mercedes-Benz GLC300 4MATIC spontaneously caught fire while parked. I immediately contacted Mercedes-Benz Roadside Assistance, and the vehicle was towed for inspection. Mercedes-Benz later claimed the fire originated in the engine compartment, yet took no accountability and cited “missing components” as an excuse to avoid liability. Photographic evidence shows that the parts were present immediately after the fire. Mercedes-Benz denied that NHTSA Recall 21V961000 applied to this vehicle, despite clear similarity in symptoms (fire risk due to fuel or electrical issues). I was also never notified of any fire risk. Furthermore, towing coordination failures led to my vehicle being sent to a third-party lot, incurring unauthorized fees. Safety Concern: The spontaneous combustion of this vehicle presents a serious public safety risk. I am concerned this issue may be more widespread and underreported. Mercedes-Benz’s failure to take accountability and deflecting blame could endanger other consumers. Desired Action: 1. Federal investigation into similar fire-related complaints involving 2019 GLC300s. 2. Reconsideration of eligibility under Recall 21V961000 or related campaigns. 3. Consumer safety alert or expanded recall if defect patterns are confirmed. Attachments Provided: - Mercedes-Benz USA denial letter dated July 11, 2025 - Photos of the fire damage - Letters and written communications Signature: [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

On May 22, 2025, while parked, my 2019 Mercedes-Benz GLC300 spontaneously caught fire, completely destroying the vehicle. Thankfully, no one was inside, and no injuries occurred, but the property damage was significant. I later discovered Recall 21V961000 / Campaign 2022030003 affecting some 2019 GLC300s for fuel leaks at the fuel rail/injector interface, which pose a serious fire hazard. Further research has shown reports of loose ground connections in these vehicles as well, increasing the risk of sparks igniting leaked fuel. Given that my vehicle caught fire spontaneously and matches the defect described in this recall, I firmly believe this incident was related to that defect. Mercedes-Benz has not provided adequate assistance. The vehicle was towed to a local dealership (Plaza Mercedes-Benz), but they refused to accept it, adding further confusion and hardship. I am submitting this report to request that NHTSA fully investigate this issue and work to ensure that Mercedes-Benz USA takes responsibility for this vehicle defect and compensates me for this dangerous failure. I am happy to provide photos, tow reports, or further documentation if needed. Thank you for your assistance in ensuring public safety.

The contact owns a 2019 Mercedes-Benz GLC300. The contact stated that while shifting from reverse to drive, the vehicle stalled and remained in neutral. After the vehicle stalled, the vehicle took approximately 8 minutes before the vehicle could be shifted into drive. Once in drive, the vehicle would jerk and shift to D3 before accelerating. The check engine warning light would illuminate while in reverse. The vehicle was taken to the dealer, who diagnosed a transmission failure due to a malfunctioning valve body and low pump pressure. The dealer confirmed that the VIN was not under recall and that the issue was not covered under warranty. The vehicle was not repaired. The contact informed the manufacturer of the failure, and a case was opened. The manufacturer referred the contact to the NHTSA Hotline to report the failure. The failure mileage was approximately 60,000.

A message that passenger air bag is damaged/will not deploy appears. Passenger seat belt gets stuck and cannot be opened. Check engine light on-pvc valve issue most likely.

Faulty Positive Crankcase Ventilation Valve. Seems a very common failure which causes poor emissions and potentially further engine damage.

The contact owns a 2019 Mercedes-Benz GLC350E. The contact stated while attempting to reverse, the rearview camera failed to display an image. No warning lights were illuminated. The contact stated that the dealer was contacted. The vehicle was taken to a dealer where it was diagnosed and determined that the backover prevention software needed to be updated. The vehicle was not repaired. The VIN was not included in NHTSA Campaign Number: 22V232000 (BACK OVER PREVENTION). The manufacturer was notified of the failure and informed the contact that the vehicle needed to be diagnosed before a case could be filed. The failure mileage was 76,954.

The contact owns a 2019 Mercedes-Benz GLC350. The contact stated while driving 62 MPH, several unknown warning lights illuminated, and the vehicle started to lose motive power. The contact stated that the temperature gauge warning light was illuminated and a message to “Stop Vehicle Immediately” was displayed. The contact attempted to merge to the side of the road; however, the vehicle started losing motive power. The vehicle was towed to a dealer where it was diagnosed with a warped head gasket. The local dealer was contacted; however, the vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 63,000.

The component that failed was the right front differential. My safety and the safety of others was put at high risk as I was driving at 60 mph on the highway and my vehicle suddenly and abruptly reduced speed to about 15mph without any warning. This created an extremely dangerous and potentially hazardous situation as I tried to maneuver my car at this very low speed on the highway in the middle lane safely to the side of the highway. Cars around me quickly maneuvered around me in attempts to avoid my slow moving vehicle and not hit me. The entire experience was terrifying, especially given that the car gave no prior indication of a malfunction. The vehicle had to be towed to Mercedes. I have no real answers from Mercedes as to the cause or why the vehicle did not notify me or why the service light did not go on. The vehicle only had 51,000 miles and is well taken care of. Because the car was out of warranty they refused to cover the expense. I called and sent letters to corporate and received $2500 towards a $6000 bill. I feel this was a safety issue and my car shut down without any type of warning and Mercedes should cover all repair costs. The car has been repaired, but I am still nervous to drive it.

PCV valve failure preventing SMOG with 27,000 miles. Extended warranty provided with P052E71 code but not with P1D0313 code which is a related problem. Contacted Mercedes, and stated the problem and description per in extended warranty, it is related to problem which is a partial pcv valve. Please help to update. [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Sunroof exploded while I was driving. No other cars around me, pretty day, not a very hot day. I’m driving along and suddenly hear a loud POP that sounded like a shotgun going off! I swerved, but thankfully did not leave the road. Shattered glass was contained in the cover of the sunroof as I didn’t have it open at the time. A huge hole is in my roof of my car! I called the dealership who said it was not covered under any warranty although I just got the vehicle in Feb of this year. He said I would have to contact corporate. I contacted corporate who said bring it in for an inspection. At the conclusion of the inspection on 10/8/24, they could not determine if it was a manufacturer defect or outside sources since they could not find a point of impact, because the glass was nearly all gone. I had to get my insurance involved. There was no warning whatsoever. The dealership said no recalls. It just exploded all of a sudden!