2021 Mercedes-Benz GLE 350 4Matic problems

“The engine/check-engine and cold-start noise problems have recurred despite multiple dealer repairs. In July-August 2025 the dealer documented misfire codes and a loud screech after cold starts. Its Aug-Sept repair order recorded the check-engine light returning one day after coil work, coolant entering a cylinder, and head-gasket/injector work. The dealer reported a completed test drive Sept. 17, 2025; the owner reported the vehicle broke down again Sept. 24 after only a short period of use. The service manager later described coolant/oil mixing and damaged crankshaft bearings, but said the precise cause/timing could not be determined; an engine rebuild was performed. In January 2026 the vehicle again had misfire codes, engine knocking, very low compression in one cylinder and leaking valve seats, leading to a new cylinder head under a warranty extension. A screeching startup noise has again been reported in 2026, including a recent noise when moving/reversing. The current source is unknown. The concern is possible recurrence of an engine-related failure that could disable the vehicle in traffic. There was no reported crash, fire or injury. The vehicle and…”

“​1. The Factory Assembly Defect ​During production of the 2020–2021 GLE and GLS line (V167 platform), Mercedes-Benz factory assembly workers improperly secured or seated the air conditioning evaporator condensation drain hoses. Because condensation water could not drain out underneath the vehicle, it emptied inside the vehicle—pooling silently underneath the heavy soundproofing foam, carpeting, and floor pans. ​2. The Resulting Hidden Damage ​Underneath the floorboards of the GLE sits critical electrical infrastructure, including the main vehicle wiring harnesses, CAN-bus junctions, and sensitive electronic control modules. ​As water accumulated, it submerged and corroded these electrical connectors. ​This failure caused severe symptoms documented by NHTSA: sudden engine stalls, loss of drive power (limp-home mode), failure of the eCall crash system, locked doors, and fire hazards from electrical short circuits. ​Because the foam soaked up gallons before dampness was ever felt on top of the carpet, the vehicle had zero symptoms during the factory warranty period—the damage developed silently out of sight. ​3. The Regulatory Recalls ​Mercedes-Benz AG was forced…”

“2021 GLE350 - 4JGFB4KB7MA355768 purchased December 30, 2024 with 35,000. miles. Current milage 61,933. There is a critical electrical/software defect in the MBUX system which has completely blacked out. This VIN# has not been placed on recall but it is suffering the same failure as previous models (Including NHTSA campaign #21V354 and #26V281000 and I believe it warrants further investigation. The display failure creates significant safety hazards. Loff of Rear View Camera. Loss of Driver Instruments Warning. Essential driver information, including speed, safety warnings and system alerts while the vehicle is in motion, which creates a safety hazard. I have reached out to Mercedez corporate office, dealership, the issue remains unresolved. I request that NHTSA log this safety complaint and evaluate whether further enforcement or expended recall action is required to ensure Mercedes remedies this defect at no cost to vehicle owners.”

“While driving on I-84 between [XXX] and [XXX] , the vehicle experienced a sudden and complete engine failure with no prior warning. The engine seized, resulting in an immediate loss of power while traveling at highway speed, creating a dangerous situation in active traffic. The driver was fortunate to safely pull the vehicle onto an exit ramp. State police arrived and positioned their vehicle behind it to prevent a potential collision with other vehicles. There were no warning lights or prior symptoms before the failure. The vehicle had approximately 80,000miles and was regularly maintained. The issue has been confirmed by a service center, and the engine may require full replacement. The sudden and unexpected nature of this failure raises serious safety concerns and potential defect issues.”