2021 Mercedes-Benz Glc300 Engine Problems
NHTSA lists 31 Engine complaints for the 2021 Mercedes-Benz Glc300, 47% of its 66 total complaints, with a median failure mileage of 7,000 miles. There is no related recall for this problem area.
- Engine complaints
- 31
- 47% of 66
- Crashes reported
- 1
- Fires reported
- 0
- Injuries reported
- 0
- Median mileage
- 7,000 mi
- Related recalls
- 0
Typical engine symptoms owners report
- Vehicle loses power and won't accelerate when the pedal is pressed, sometimes with the check engine light on, then returns to normal after a restart.
- Engine stalls or shuts off suddenly while driving, in some cases with sputtering or hesitation before shutdown.
- Vehicle refuses to accelerate past roughly 20-25 mph even with the throttle fully depressed, described as a repeated issue by more than one owner.
- A valve spring broke early on, causing the engine to fail while driving at very low mileage.
- An 'Add 1 quart of oil' warning escalated to a 'Stop driving' message, with the owner reporting the engine was already low on oil.
- Owners report engine shaking, hesitation, and check engine light activation together at low speed, with one case tied to a leaking cylinder head valve and faulty injector.
When 2021 Mercedes-Benz Glc300 engine complaints were filed
First complaint Mar 8, 2021, latest Aug 30, 2026.
Engine recalls for the 2021 Mercedes-Benz Glc300
No safety recalls on record for this model year.
Engine complaints by Glc300 model year
Raw complaint counts per model year; newer years have had less time to accumulate complaints.
Frequently asked questions
- How common are engine problems in the 2021 Mercedes-Benz Glc300?
- NHTSA records 31 Engine complaints for the 2021 Glc300, which makes up 47% of all 66 complaints filed for that model year.
- Is there a recall for the 2021 Mercedes-Benz Glc300 engine?
- No. NHTSA lists no related recalls tied to this engine problem area for the 2021 Glc300.
- At what mileage do 2021 Glc300 engine problems usually show up?
- The median mileage at failure reported to NHTSA for this engine problem area is 7,000 miles.
- Did any 2021 Glc300 engine complaints involve a crash or fire?
- NHTSA data shows 1 crash and 0 fires and 0 injuries linked to this engine problem area for the 2021 Glc300.
- How does the 2021 Glc300 compare to other years for engine complaints?
- The 2021 model year's 47% share of complaints tied to the engine is the highest among the years listed, compared to 25-39% share in other model years from 2016 to 2025.