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 NHTSA investigate whether a safety recall is warranted for the M264 engine across all affected GLE350, GLC300, C300, and E350 vehicles.

Source: NHTSA complaint ODI #11741934 · view all complaints for this vehicle at nhtsa.gov

While driving on the highway on three separate occasions the blind spot warning will pop up and show as inoperative, next the active break assist warning flashes as inoperative, and then the entire vehicle shows as inoperative and loses all acceleration and breaks down. This has happened three times. Stayed over night at the dealership they “drove it for 70 miles” it didn’t happen to them. They released the truck back to me saying it was perfectly fine. A day later it happened again while on the highway. Highly unsafe!

Source: NHTSA complaint ODI #11746371 · view all complaints for this vehicle at nhtsa.gov

I can be driving on a flat surface with out the car been on eco mode and the car shuts off for no reason without and light on the dash board I have to wait a few secs to restart the car ,brakes don't stop like they should very loud grinding noise and comes. I have report this problem lots of times and my car was not fix it stay more in the shop then with me the car senc don't work the light up red like if someones next to me

Source: NHTSA complaint ODI #11479876 · view all complaints for this vehicle at nhtsa.gov

2021 Mercedes-Benz GLE 350 W. APROX: 30,000 MILES. PURCHASED THE VEHICLE 3 YEARS AGO, WHEN IT HAD 17,000 MILES ON IT. WHEN DRIVING AT TIMES THE PASSENGER REAR SHOCK WILL START MAKING SQEAKING / CREAKING NOISES. BEEN LIKE THIS FOR ALMOST 1 YEAR NOW. I DONT DRIVE THE VEHICLE VERY OFTEN, BUT WHEN I DO DRIVE IT IT IRRITATES ME. THE DEALERSHIP SAID THE SHOCK NEEDS TO BE REPLACED. THERE ARE NO VISIBLE LEAKS, NO ABNORMAL RIDE QUALITY, ETC.

Source: NHTSA complaint ODI #11740482 · view all complaints for this vehicle at nhtsa.gov

Sunroof makes loud, high pitched noise when it’s windy or driving high speeds. Sunroof complaints found online for bad seals or components of sunroof being bad or unaligned. Sounds could cause driver not to hear other safety issues with vehicle as well as leaking if water.

Source: NHTSA complaint ODI #11708279 · view all complaints for this vehicle at nhtsa.gov