2019 Mercedes-Benz C 300 engine problems
15 owner complaints filed with NHTSA name the engine on the 2019 Mercedes-Benz C 300 — 23% of all complaints for this model year.
What owners report
“Throttle body and accelerator pedal position sensors failed. Component is available for inspection upon request. Independent service center confirmed failure on 1/3/2026 with 6 stored fault codes: P2101, P0122, P0222, P0123, P0223, P2135. Vehicle shuts off while driving without warning at various…”
filed Jul 1, 2026
“Upon starting engine while parked the engine vibrated roughly then stopped. Engine light and coolant light illuminated but shut off. Vehicle proceeded as normal, however, as I proceeded for the highway about 1 - 1/2 blocks and approximately 1,200 feet before approaching highway the vehicle 1200…”
filed May 19, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related service bulletins
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz, has determined that on certain MY 2019-2021 C-Class, G-Class, GLC, GT, S-Class (205, 463, 253, 190 & 222 platforms) vehicles, the engine control unit…
Emissions - 2024100016 · Emissions · issued Jul 24, 2026
Engine problems in other C 300 years
| Year | Reports | Share |
|---|---|---|
| 2023 C 300 | 2 | 9% |
| 2022 C 300 | 2 | 8% |
| 2020 C 300 | 8 | 24% |
| 2018 C 300 | 34 | 35% |
| 2017 C 300 | 77 | 36% |
Other reported problem areas on the 2019 Mercedes-Benz C 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.