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What 82 owners told NHTSA about the 2021 Mercedes-benz Gle-class Hybrid

These are the actual owner complaints behind this car’s reliability verdict, filed with the federal government, unedited. They’re unverified reports, not confirmed defects: read them as leads for your pre-purchase inspection, not a diagnosis.

All (82)Crash / fire / injury (5)Engine (34)Electrical system (29)Transmission & drivetrain (8)Driver assistance (6)Visibility & wipers (6)Fuel system (5)Brakes (4)Speed control (4)Body & structure (3)Lane Departure (2)

2 of 82 complaints match · Lane Departure · clear filters

Jun 25, 2026Lane DepartureDriver assistance

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!

NHTSA ODI 11746371

Feb 17, 2026Speed controlLane Departure

The vehicle has repeatedly experienced a sudden loss of acceleration, entering a reduced-power state while driving. Most recently, this occurred less than one week after I was advised that the issue had been fully resolved through a relay replacement. Critically, these incidents have occurred while my [XXX] child was in the vehicle, creating an unsafe and unacceptable situation. Below is a summary of the work that was done to resolve the safety concern. October: Drivetrain/Powertrain control unit internal fault Replacement of gateway/powertrain control module Wiring, grounding, and software inspections November: Active Brake Assist, ESP, and voltage supply faults Failure of both rear wheel speed sensors Replacement of left and right rear wheel speed sensors December: Dealership identified a faulty relay as the root cause Relay replaced and vehicle returned to service January, the vehicle again lost acceleration. And now, again in February. The same loss in acceleration incident. At this point, the vehicle has demonstrated a pattern of unresolved, safety-critical electrical failures. Given the repeated nature of the issue, the prior replacement of major components, and the involvement of braking and drivetrain systems, I no longer feel confident that additional part replacement without corporate oversight will result in a safe or permanent resolution. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA ODI 11718456

Working with the data? Download all 82 complaints as CSV · fetched from NHTSA July 25, 2026

How to use these: a complaint is one owner’s report, filed voluntarily and published unverified. Patterns matter more than any single story. If several owners describe the same failure at similar mileage, put that system at the top of your pre-purchase inspection list. Back to the full 2021 Mercedes-benz Gle-class Hybrid verdict →