2017 Mercedes-Benz C 300 Engine Problems
Owners have filed 77 complaints with NHTSA about engine problems on the 2017 Mercedes-Benz C 300, 36% of all complaints for this model year. Half of the reports with a mileage happened before 36,000 miles. The words owners use most often: “crankcase ventilation” (29% of reports).
- 77engine complaints
- 36,000median miles at failure
- 0mention a crash
- 0mention an injury
- 1related recalls
- $2,350typical repair cost reported by owners
- 33%of reports with a speed happened at 50+ mph
What owners describe
Phrases that appear unusually often in these complaints compared with complaints about other cars.
- Crankcase ventilation: mentioned in 22 of 77 complaints (29%)
- Code P052E: mentioned in 15 of 77 complaints (19%)
- Regulator valve: mentioned in 8 of 77 complaints (10%)
- Electrical engine engine: mentioned in 6 of 77 complaints (8%)
How much does it cost to fix?
Owners who wrote down what they paid or were quoted put the typical engine repair on the 2017 Mercedes-Benz C 300 at $2,350, and half of them between $2,150 and $2,650.
Based on 8 NHTSA complaints about this problem alone that state a repair bill or quote (2022–2026), converted to 2026 dollars with the U.S. consumer price index. These are owners' own figures, not a quote: they include dealer quotes, and owners who file complaints often faced larger repairs, so they can run higher than typical shop prices. Prices vary by shop, region and warranty coverage. How we calculate this.
At what mileage do engine problems happen?
Based on 9 complaints that reported the odometer reading.
How serious are the reports?
Of 77 complaints, 1 a fire.
Mercedes-Benz C300 engine complaints by model year
| Model year | Engine complaints | Share of that year | Median miles |
|---|---|---|---|
| 2024 C300 | 2 | 18% | — |
| 2023 C300 | 2 | 9% | 3,900 |
| 2022 C300 | 2 | 8% | — |
| 2021 C300 | 8 | 57% | 87,039 |
| 2020 C300 | 8 | 24% | 77,500 |
| 2019 C300 | 17 | 25% | 5,350 |
| 2018 C300 | 34 | 34% | 14,000 |
| 2017 C300 | 77 | 36% | 36,000 |
| 2016 C300 | 93 | 32% | 23,750 |
| 2015 C300 | 127 | 33% | 53,000 |
| 2014 C300 | 2 | 2% | — |
| 2013 C300 | 8 | 3% | 75,000 |
| 2012 C300 | 5 | 2% | 53,000 |
| 2011 C300 | 10 | 2% | 78,000 |
| 2010 C300 | 13 | 3% | 70,000 |
| 2009 C300 | 16 | 3% | 70,000 |
| 2008 C300 | 31 | 5% | 80,000 |
When owners reported it
Related recalls (1)
Electrical system:starter assembly; engine and engine cooling:engine
Problem: Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2015-2017 C300 4Matic, C300, CLA250, CLA250 4Matic and CLA45 AMG vehicles, 2017 C300 4Matic Cabrio, C300 4Matic Coupe, C300 Cabrio, C300 Coupe, E300, E300 4Matic, E400 4Matic Wagon, E43 AMG 4Matic, GLA250, GLA250 4Matic and GLC300 4Matic Coupe vehicles and 2016 C350e and GLC300 vehicles and 2016-2017 C450 4Matic AMG Sport and GLC300 4Matic vehicles. In the event that the engine or transmission cannot turn over, the starting current limiter may overheat from the repeated attempts of the starter motor attempting to start the vehicle.
Risk: If the starting current limiter overheats, the surrounding components can melt, increasing the risk of a fire.
Fix: MBUSA will notify owners, and dealers will install an additional fuse in the electrical line to the starter, free of charge. The recall began August 31, 2017. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2017080002.
What owners report
Short excerpts of recent complaints, with personal details removed. Full reports are on NHTSA.gov.
2017 Mercedes c300 the switchover valve in the diagnostic module of the evaporative emission control system is jammed open. This issue was called for recall for models 2018 or later, but 2017 was not part of it.
The contact owns a 2017 Mercedes-Benz C300. While driving at approximately 15 mph, the contact observed smoke emanating from under the hood. The vehicle was driven to her work location and parked. Upon exiting the vehicle and opening the hood, she observed orange flames coming from the engine…
Check engine light for P052E which has been coming and going off for years now. Now the check engine light is there permanently. I spoke to Mercedes Benz customer service and requested for them to fix the problem now that the light is on permanently but they refuse to fix it because the car has…
Frequently asked questions
Do all 2017 Mercedes-Benz C 300s have engine problems?
No. NHTSA has 77 owner complaints about engine for the 2017 Mercedes-Benz C 300 (36% of the 216 complaints for this model year). Complaint data shows that the problem is reported, not how many of all cars sold are affected.
Was there a recall on the 2017 Mercedes-Benz C 300 engine?
Yes: 1 safety recall list engine. Check your VIN on NHTSA.gov to see whether the fix was done on your car.
At what mileage do engine problems start?
The median reported mileage is 36,000 miles: half of the reports with a mileage came before that.
How much does it cost to fix engine problems on the 2017 Mercedes-Benz C 300?
Owners report a typical cost of $2,350 (half paid between $2,150 and $2,650), from 8 complaints that state a repair bill or quote, in 2026 dollars.
What do owners say about engine problems on the 2017 Mercedes-Benz C 300?
The most frequent phrase is “crankcase ventilation”, in 22 of 77 complaints, followed by “code p052e” (15).
See all 2017 Mercedes-Benz C 300 problems or engine problems across all C300 years.