AI Damage2015 Mercedes-Benz C400 reliability: common problems
Owners of the 2015 Mercedes-Benz C400 filed 10 complaints with NHTSA, most often about structure and electrical system. Details by component below, with sources.
Key figures
- Owner complaints
- 10
What fails most often
- 1 Structure 60% of all complaints
- 2 Electrical system 10% of all complaints
- 3 Electronic stability control 10% of all complaints
- 4 Engine 10% of all complaints
- 5 Suspension 10% of all complaints
- 6 Vehicle speed control 10% of all complaints
- 7 Visibility 10% of all complaints
- Structure: 6 complaints (60% of all).
- Electrical system: 1 complaints (10% of all).
- Electronic stability control: 1 complaints (10% of all).
- Engine: 1 complaints (10% of all).
- Suspension: 1 complaints (10% of all).
Symptoms owners describe
How many of the 10 NHTSA complaints mention each symptom (automatic count from complaint text; one complaint can mention several).
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Structure | 6 | 0 | 0 |
| Electrical system | 1 | 0 | 0 |
| Electronic stability control | 1 | 0 | 0 |
| Engine | 1 | 0 | 0 |
| Suspension | 1 | 0 | 0 |
| Vehicle speed control | 1 | 0 | 0 |
| Visibility | 1 | 0 | 0 |
| Other | 1 | 0 | 0 |
What owners report
Short excerpts of NHTSA complaints in the original wording. These are owner statements not verified by NHTSA; personal data removed.
Rear subframe cracked while driving and rear of car sways from one lane to the next when brakes are applied. Car is not safe
My boyfriend and I were driving my 2015 MB C400 down the road in November 2020 and it was a beautiful day out so we decided we would open the sunroof to get some fresh air. I was driving so my boyfriend pressed the button for the sunroof to open.
My car failed PA State inspection due to a hole and rusted rear subframe. I have determined that there is a recall associated with this issue but that my vehicle just missed the recall limit. The recall affected 2008-2015 models (C Class with chassis 204). My vehicle is a 2015 C Class with chassis 205.
Panoramic glaaa sunroof mounting bracket made of cheap thin plastic that it breaks easily allowing the panoramic glass roof to fly off the car if driven while open.
Engine randomly stalls after sitting at red light/or while in traffic. All warning/dashboard lights come on and you can only start the car by putting it in park, then pushing start. The car has less than 10k miles. Dealership can't find code or replicate the issue.
While driving the vehicle on the highway at 70 mph, the cruise control shut off and the car began to slow down. I was able to maintain control and noticed 3 error messages including: esc inoperable, cruise control inoperable, and collision prevention plus inoperable.
The panoramic sunroof in my car exploded at approximately 6.45am on monday, june 29th 2015. The car was purchased new from mercedes benz in paramus on saturday, june 27th, 2015. The car had 146 miles on the odometer. I was in nj and I was traveling west on I-78 (express lanes) at approximately 65mph.
When owners complained
NHTSA complaints by filing year. The peak shows at what age the problems show up most.
Comparison
By complaint count this model year ranks 10,220 of 32,257 model years in the NHTSA data (top 32% most complained about).
What to check before buying
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Electronic stability control. ABS/ESC sensors, steering angle, codes after suspension repair.
- Engine. Cold start, unusual noises, oil leaks and engine codes.
Questions and answers
What are the most common problems with the 2015 Mercedes-Benz C400?
Owner complaints to NHTSA most often mention: structure, electrical system, electronic stability control. Total complaints: 10. The most frequent symptoms in complaint texts: windows, sunroof (30%), rust, corrosion (10%), stalls while driving (10%).
How many service bulletins (TSB) were issued for the 2015 Mercedes-Benz C400?
NHTSA lists 0 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2015 Mercedes-Benz C400 from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2015 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-06.