2021 Mercedes-Benz GLE 350: engine stalls while driving

Filed Jun 3, 2026 · Engine · CA

At approximately 87,000 miles, my 2021 GLE350 (M264 2.0T engine) experienced a severe engine misfire resulting in a flashing check engine light, rough idle, engine shaking, significant loss of power, and near-stall condition. The vehicle was taken to Speedhaus Automotive (Newbury Park, CA) where all four ignition coils and spark plugs were replaced. Total repair cost was approximately $635. This failure pattern is consistent with the documented M264 exhaust valve seat wear issue acknowledged by Mercedes-Benz technicians. A Mercedes dealer service report on an identical 2021 GLE350 explicitly states: "COMMON ISSUE FOR EXHAUST VALVE SEATS TO WEAR — KNOWN ISSUE WITH 260 AND 264 MOTORS." Mercedes-Benz has extended the warranty on the M260 engine (transverse variant) for this identical failure mode but has not extended it for the longitudinally-mounted M264 despite the same defect being present. Repair costs for full cylinder head failure on the M264 are being quoted at $6,000–$13,000. I am requesting the federal safety agency investigate whether a safety recall is warranted for the M264 engine across all affected GLE350, GLC300, C300, and E350 vehicles.

Filed Jan 8, 2026 · Engine · FL

There is a known issue with the Cylinder Heads on specific models of Mercedes vehicles. Symptoms of M264 Cylinder Head Failure If your GLE 350 is experiencing these symptoms, it may be covered under the extension: Check Engine Light (MIL): Often triggered by misfire codes. Rough Idle: Noticeable shaking or uneven idling when stopped. Loss of Power: Potential stalling or significant power reduction during acceleration. Low Compression: Diagnostic tests often reveal low pressure in one or more cylinders. This is not being addressed my Mercedes USA where Mercedes Canada has offered an extended warranty. Using social media I have comprised a list of over a hundred impacted owners. Many more exist. What this does is cost catastrophic failure of the engine leaving the driver stranded in whatever lanes they were traveling in. I am disabled and for me this created a life threatening situation. When reaching out to MBUSA the answer is simply "not warranty exists" where MB Canada has extended the warranty to an additional 15k miles from notice. My engine blew. The replacement cost is near $20,000 dollars. The mileage on my engine was 65k. Many others are impacted and a class action lawsuit is the only other course of action it seems. Regards, [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Oct 24, 2025 · Engine · 69,100 miles · GA

The contact owns a 2021 Mercedes-Benz GLE350. The contact stated that while driving 65-70 MPH, the vehicle was skipping. The contact immediately veered towards an exit ramp. The contact noticed knocking sounds coming from the engine, and the vehicle stalled on the exit ramp. There was smoke coming from underneath the hood. The vehicle failed to restart and was towed to the dealer, where it was diagnosed that the engine had imploded and sustained a hole. The dealer determined that the engine needed to be replaced. Additionally, the dealer took the engine apart and informed the contact that the cause of the engine implosion could not be determined even with the assistance of the engineers. The vehicle was not repaired due to the cost. The contact then brought an independent mechanic to the dealer to inspect the vehicle. The mechanic inspected the engine and informed the contact that the failure had occurred due to a lack of engine oil; however, the contact stated that the dealer had performed an oil change on the vehicle 27 days prior to the failure. The manufacturer was notified of the failure but denied assistance in covering the repair. The manufacturer informed the contact that the engineers had not yet determined the cause of the engine implosion. The failure mileage was 69,100.

Filed Oct 14, 2025 · Transmission · TX

Location: Dallas, TX – Woodall Rodgers Freeway near North Hall Street exit Mercedes-Benz USA Case #: 18469650 What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle’s 48-volt electrical architecture appears to have failed, specifically the DC/DC converter or Integrated Starter-Generator (ISG) that provides 12-volt power to all control modules. When this component failed, it caused a total loss of propulsion and electrical power. The vehicle is currently at a Mercedes-Benz dealership in Dallas and available for inspection upon request by the federal safety agency or Mercedes-Benz USA (case #18469650). How was your safety or the safety of others put at risk? While driving approximately 50 mph on the Woodall Rodgers Freeway with my family in the car, the vehicle suddenly lost all engine power and throttle response without warning. The accelerator stopped responding, and the engine stalled completely within seconds. I was able to coast partially onto an exit ramp, but once stopped, the car would not restart and could not be shifted into Neutral. We were stranded in live traffic with limited steering assist and no way to move the vehicle, placing my family and other motorists at serious risk of collision. Has the problem been reproduced or confirmed by a dealer or independent service center? The vehicle is currently at a Mercedes-Benz authorized dealer, and the failure has been logged with Mercedes-Benz USA under case #18469650. Initial findings point to a malfunction of the DC/DC converter or 48-volt system. Full STAR diagnostic data and fault codes are pending. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives, or others? Mercedes-Benz USA has been notified and opened case #18469650. The vehicle has been inspected by the dealership’s certified technicians and is awaiting official diagnostic reporting and possible engineering review through Mercedes’ Technical Assistance

Filed Aug 7, 2025 · Fuel system · FL

The car has stalled 4 or 5 times, while driving in traffic. This can obviously be life threatening. The check engine light came on yesterday. We recently brought the car to Mercedes Benz in Daytona Beach, Florida. They told us we had low pressure in the cylinders, and needed a new cylinder head for $10,000. The cylinder pressures on their test however were all normal. They never mentioned a recall for a fuel pump defect causing cars to stall. A local independent repair company confirmed the cylinder pressure test was normal. Mercedes recalled 324,000 vehicles for this defective fuel pump between 2012 and 2020 (abc news). They recalled over 143,000 vehicles from June 2021 to 2023. My model, GLE350, was included in both recalls. I called Mercedes customer service. They said my car was built in February 2021, and there is no recall for this vehicle. There have been recalls for defective fuel pumps from 2012 to 2020, and June 2021 to 2023. I strongly suspect my vehicle built in February 2021 has the same defective fuel pump. I will bring the vehicle to an independent well qualified service center. If they diagnose a fuel pump problem. I would like Mercedes to reimburse me for the repair.

Filed Jul 11, 2025 · Engine · TX

On May 26, 2025, around 3:00 PM, I was traveling with my family on a bright and sunny day, with no rain for several days leaving the roads dry. As we were on I-35, I took an exit, and just a few seconds later, my 2021 Mercedes-Benz GLE 350 unexpectedly shut off, all the lights on the the dashboard lit up, and the vehicle came to a sudden and complete stop. Thankfully, this incident occurred on the service road rather than the highway, and we were at low speed otherwise it could have posed a serious risk to my family and me. Once the car stalled, both the steering and tires locked up. However the vehicle had power but would not start or move. As the same situation could happen to someone else which could put them at serious risk it might be in the best interest of Mercedes-Benz to research and fix this issue. I reached out for a tow truck, and the driver had to hook it up and drag my vehicle onto the flatbed. Mercedes-Benz service suggested a replacement of the engine and could not diagnose what the issue is. I have consistently performed the recommended maintenance on my vehicle since I purchased it, and it currently has around 63,000 miles.