2021 Mercedes-Benz GLC 300 fuel/propulsion system problems
10 owner complaints filed with NHTSA name the fuel/propulsion system on the 2021 Mercedes-Benz GLC 300 — 15% of all complaints for this model year.
What owners report
“The vehicle is experiencing an intermittent, sudden, and life-threatening drop into "limp home mode" while driving, creating an severe speed differential with surrounding traffic.First Incident (50,584 miles): The vehicle entered limp mode. Authorized Mercedes service center scanned the car…”
filed Aug 30, 2026
“The contact owns a 2021 Mercedes-Benz GLC300. The contact stated that while driving at low speeds, the vehicle lost motive power struggling to produce enough power to propel itself on a slight incline. The check engine warning light was illuminated. The vehicle was taken to an independent mechanic…”
filed Dec 4, 2024
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty coverage for…
CL - Tank Leak Detection · Warranty Program/Extension · issued Aug 15, 2026This NCU replaces the prior NCU issued on May 15, 2025, and contains additional MY 2023 and MY 2024 vehicles which are highlighted below. In our continuing efforts to ensure the proper performance of Mercedes-Benz…
EW - DMTL · Warranty Program/Extension · issued Jul 31, 2026
Fuel/propulsion System problems in other GLC 300 years
| Year | Reports | Share |
|---|---|---|
| 2023 GLC 300 | 5 | 9% |
| 2022 GLC 300 | 12 | 20% |
| 2020 GLC 300 | 4 | 6% |
| 2019 GLC 300 | 3 | 7% |
| 2018 GLC 300 | 7 | 8% |
Other reported problem areas on the 2021 Mercedes-Benz GLC 300
Counts are unique NHTSA complaints naming this component group. Complaints are unverified owner reports; mileage is computed only from complaints that included a usable odometer reading.