2020 Mercedes-Benz GLC 300 engine problems
20 owner complaints filed with NHTSA name the engine on the 2020 Mercedes-Benz GLC 300 — 30% of all complaints for this model year.
What owners report
“My 2020 Mercedes-Benz GLC 300 triggered check engine light with code P06DA (engine oil pressure control) at 40,000 miles. The failed component is an oil pressure control sensor/solenoid worth approximately $200. However, due to Mercedes-Benz's engine design (M264 engine), the entire engine must be…”
filed Jun 25, 2026
“I have had my car for almost two years. This problem has been on-going the whole time. It happens intermittently, I never know. I will be driving it and usually when I am making a turn or pulling onto a main road, you press the gas to go and the car hesitates and makes a loud brooooooooom sound…”
filed May 13, 2026
Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.
Related recalls
- Screws that retain the turbocharger oil feed and return lines may not have been properly…Campaign 20V364000 · Jun 22, 2020
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, 2026Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than…
PSL-NCU Return Parts 6/19 · Other · issued Jun 19, 2026
Engine problems in other GLC 300 years
| Year | Reports | Share |
|---|---|---|
| 2024 GLC 300 | 7 | 33% |
| 2023 GLC 300 | 15 | 27% |
| 2022 GLC 300 | 9 | 16% |
| 2021 GLC 300 | 29 | 48% |
| 2019 GLC 300 | 11 | 24% |
| 2018 GLC 300 | 28 | 32% |
Other reported problem areas on the 2020 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.