AI Damage2009 Mercedes-Benz C 300: common problems
Owners of the 2009 Mercedes-Benz C 300 filed 576 complaints with NHTSA, most often about electrical system and air bags. Details by component below, with sources.
Key figures
- Owner complaints
- 576
- involving a crash
- 14
What fails most often
- 1 Electrical system 34% of all complaints
- 2 Air bags 32% of all complaints
- 3 Steering 24% of all complaints
- 4 Exterior lighting 20% of all complaints
- 5 Suspension 6% of all complaints
- 6 Structure 5% of all complaints
- 7 Service brakes 4% of all complaints
- 8 Electronic stability control 3% of all complaints
- Electrical system: 198 complaints (34% of all), 1 of them with a crash reported by the owner.
- Air bags: 182 complaints (32% of all), 13 of them with a crash reported by the owner.
- Steering: 136 complaints (24% of all).
- Exterior lighting: 118 complaints (20% of all), 1 of them with a crash reported by the owner.
- Suspension: 36 complaints (6% of all).
Symptoms owners describe
How many of the 576 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) |
|---|---|---|---|
| Electrical system | 198 | 1 | 0 |
| Air bags | 182 | 13 | 0 |
| Steering | 136 | 0 | 0 |
| Exterior lighting | 118 | 1 | 0 |
| Suspension | 36 | 0 | 0 |
| Structure | 27 | 1 | 0 |
| Service brakes | 21 | 2 | 0 |
| Electronic stability control | 20 | 0 | 0 |
| Engine | 16 | 1 | 0 |
| Tires | 9 | 0 | 0 |
| Seat belts | 8 | 1 | 0 |
| Vehicle speed control | 8 | 2 | 0 |
| Engine and cooling | 6 | 0 | 0 |
| Powertrain | 5 | 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.
The air bag did not deploy. A police report was not filed. The contact sustained a minor injury that did not require medical attention. The vehicle was damaged, but not totaled. The contact drove the vehicle home and contacted the insurance company.
The air bags failed to deploy and the seat belt tightened. The paramedics arrived and assisted in removing the passenger from the vehicle. A police report was filed. One injury was sustained, which required medical attention. The vehicle was towed.
The air bags failed to deploy. A police report was filed and there were no injuries the vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The approximate failure mileage was 54,000. Updated 02/21/17 updated 9/5/18
The contact stated that while at the dealer he slowed the vehicle down in order to drive through an automatic door when sudden acceleration occurred causing the contact to crash into the door. The driver and two other people were injured.
I have messages on my instrument panel stating I have airbag malfunction going on I also have tail lights that are not working and after trying to replace the bulbs it still don't work so obviously it's the light bulb panel so I went and looked at recalls and says that these are all recalls on my car but that they…
The contact stated that while starting the vehicle, the check engine, seat belt, and air bag warning lights illuminated. Additionally, the headlights and navigation lights failed to activate for a while. There was burning odor inside the vehicle with the heat activated or turned off.
The problem is that the steering wheel locking mechanism has failed. The vehicle could not be started or driven. It required a flatbed tow to an authorized Mercedes repair facility. It was diagnosed as the steering mechanism, requiring replacement. The cost for this repair is $1400.00.
Check Right Tail and Brake Lamps warning light will not go off for months. They are working fine but the light won't go off. Googling on MB World, it shows Mercedes is aware of this problem and a recall is needed to get it corrected being safety issue with warning lights not working properly. See all info.
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 620 of 36,659 model years in the NHTSA data (top 2% most complained about).
On average one model year of the C 300 has 199 complaints (20 years in the data). This year has 576, above average.
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Air bags. Check the SRS light, stored codes and airbag/curtain status after any impact.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Exterior lighting. Headlamps, leveling, sensors and mounts after a frontal hit.
Other years of this model
- C 300 2008672 sources
- C 300 2010453 sources
- C 300 2011480 sources
- C 300 2012267 sources
- C 300 2013262 sources
- C 300 201494 sources
- C 300 2015382 sources
- C 300 2016417 sources
- C 300 2017365 sources
- C 300 2018259 sources
- C 300 2019231 sources
- C 300 2020215 sources
- C 300 2021193 sources
- C 300 2022417 sources
- C 300 2023381 sources
- C 300 2024325 sources
- C 300 2025171 sources
- C 300 202689 sources
- C 300 202710 sources
Questions and answers
What are the most common problems with the 2009 Mercedes-Benz C 300?
Owner complaints to NHTSA most often mention: electrical system, air bags, steering. Total complaints: 576. The most frequent symptoms in complaint texts: won't start (17%), steering or power steering problems (16%), headlights and tail lights (15%).
How many service bulletins (TSB) were issued for the 2009 Mercedes-Benz C 300?
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 2009 Mercedes-Benz C 300 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 2009 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.