Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2008 Mercedes-Benz C350 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2008 Mercedes-Benz C350. The contact stated that after the vehicle was turned off, she attempted to restart the vehicle, but the engine failed to turn over. The contact stated that the next day the vehicle started; however, while driving at an undisclosed speed, the vehicle stalled. The contact stated that several unknown warning lights illuminated, and the speedometer started to malfunction. The vehicle was towed to the dealer; however, the contact was unsure if the vehicle was diagnosed. Additionally, the contact stated that on a separate occasion while driving at an undisclosed speed, she noticed that water had started to leak from the sun visor. The contact also heard water moving around on the floorboard. The vehicle was not diagnosed. The vehicle was not repaired. The manufacturer was not notified of the failure. The failure mileage was approximately 166,000.
All of a sudden, the car would not start and inserting the key and turning doesn't do anything. Turns out that like many other folks, the Electronic Steering Lock module is faulty and preventing the car from starting. Found out that only the dealer can fix it and mercedes provides the replacement part. The cost is unaffordable at $2200 from the dealer and the part is back ordered and won't be available for approximately 2 months. This is completely unacceptable and mercedes should prioritize and fix this issue as a safety issue with a recall since it completely makes the car non-driveable and nobody but the dealer can fix this, which allows the dealer to charge any amount they like.
The ESL system malfunction causes either steering lock or ignition switch to fail resulting in a failure to start the vehicle creating safety issues and a failure to reach safe destination. This problem is reported to be an extremely common issue in the Mercedes Benz W204 C-Class models.
After receiving several dashboard warning messages and, I went into higgenbothom Mercedes in jackson, ms on 10/12/12 my vehicle was diagnosed as needing a right rear contact plate and harness is shorted out. About a week in a half ago my lights on right side (both front and back tail lights) will flash on and off periodically when my lights are in the auto position and the engine is off. My daughter emailed me an article mentioning a posible defect so I called Mercedes and was told to contact my dealership to get an estimate and then call them back and a case manager would contact me in 24 hours. I took my vehicle in 07/24/13 they diagnosed the car with needing right tailamp bulb holder plate. …
I have a C350 sport, I went to start the car and the car didn't start. The lights came on, navigation came up, but it would not start. It seemed as if the car did not recognize the key; as the displayed message was "take key from ignition". The following day I paid someone to come out and look at the car, and it started right up. Battery tested normal and I thought it was a close call. Then I left to run errands and it wouldn't start and never started again. After paying $160 for the tow to the dealership; I was told if I did not have 2 keys then they can't test it. So after ordering a second key at $375; I found out it wasn't the key! If this car has so much technology in it, why can't you test the eis with a diagnostic computer, without blowing money on a $375 dollar key? After that failure I was told it was the electronic ignition switch. …
On Sunday, June 27, upon returning to my car I discovered that the key would not disengage the steering column lock to allow me to turn the ignition switch to the on position or steer the vehicle. In addition, the gearshift could not be dislodged from the park position. I contacted aaa. A test of battery revealed that it was fully charged. I was able to manually disengage the gear shift and place the car in neutral, however, the car was unable to be loaded on to the flatbed tow-truck, as the front wheels were locked at an angle and I was parked in parking space, between the sidewalk to my front and right side and a car to my left. I was forced to leave the vehicle and find an alternative means of getting home. Five days and numerous attempts later, aaa was finally able to retrieve my vehicle. …
I had just stopped to put gas in the vehicle and upon completion I got back in the car to start it. When I turned the key, the car wouldn't start. I had headlights and my dashboard was partially lit up, but nothing else would work. I then called the mb road side assistance and a technician came out and determined it was not a battery or starter problem. The technician said that it was probably the eis since he had seen the same situation before. An hour later the car was towed to the dealership, and dropped off with much trouble since the steering column didn't function. Several days later I got a call from my service consultant, informing me that the car needed the ignition starter switch as well as the eis unit and two new keys needed to be programmed. The total was $2500. …
Steering lock issue. Engine does not crank and car does not start. Upon inserting key, an message pops up asking to remove the key. Steering wheel is locked and car stuck in park. Due to the configuration of my parking garage and the fact that the steering wheel was locked, it took me several days and 4 different tow trucks to successfully tow the car 1.5 miles to my local mb dealership. The diagnosis and repair of the faulty steering lock, which the service advisor says happens all the time with my model, took an entire week. I was told mb does not offer a loaner car in this situation. All in all, it took my 2 weeks to finally get my car working again. The repair was $1,200. Add in the 4 tow trucks, and 2 weeks of rental car and this was easily a $2,000 issue. Mb should issue a recall given that this issue is so prevalent and clearly a fault with the steering lock part.
My vehicle went completely out of service and was unable to start due to a faulty electronic steering lock (esl). My vehicle only has 69,000 miles on it and this seems to be an issue with plenty of other c-class Mercedes Benz owners who have encountered the same issue. Mercedes Benz is failing to take responsibility while also my exteneded warranty that I paid $2000 for has also said they will not cover this. I highly recommend not ever buying an extended warranty from privilege protection care. They place generic terms in parts of what they cover and if the dealer or shop has a specific name for your part, although it is the product or part of the same part that needs to be replaced, they will honor the warranty. Also their customer service was rude and not very helpful at all.
I went to go turn on my car and it failed. No sound or anything. I called aaa they came and said the battery is good they just don't know what's wrong. I had to get my car tow without knowing what was wrong with it. I took it to the shop and it took them about a week to realize what was wrong with it. I called Mercedes Benz and they had no explanation to what was wrong with it or why it happen. They finally figured it out and they said it was an electric steering lock problem and that its for security reasons and that it can happen anytime. I also had to get a programming key. This cost was very expensive to not have an explanation. I also noted that a lot of c class users had this very same issue and we are not understanding why there isn't a recall.
NHTSA investigations
Loss of rear tail light functionality
ODI initially received 21 reports of rear light assembly failure due to a melted electrical connector or housing.Since opening the initial , ODI has received a total of 114 complaints reflecting an ongoing and increasing trend.In each report, one or both rear light assemblies fail completely (i.e., all lights housed within the assembly extinguish, including the stop, tail, and turn signal functions) when the…
Loss of rear lighting assembly
The Office of Defects Investigation (ODI) opened an investigation based on consumer allegations of loss of rear lighting in model year (MY) 2008-2011 Mercedes Benz C-Class vehicles.Complainants alleged that one or both rear lighting assemblies fail to illuminate (i.e., all lights housed within the assembly extinguish, including the stop, tail, and turn signal functions) or illuminate dimly.In some reports,…
Electrical complaints in other C350 years
Frequently asked questions
How common are electrical problems on the 2008 Mercedes-Benz C350?
NHTSA has 53 complaints about the electrical system of the 2008 Mercedes-Benz C350, 37% of the model year's 144 complaints. The component named most often is ignition › switch (2 mentions).
Is there a recall for 2008 Mercedes-Benz C350 electrical problems?
No. NHTSA lists no electrical system recall for the 2008 Mercedes-Benz C350, though it has 6 recalls for other components. If the problem is widespread, a repair may still be covered by an extended warranty or a manufacturer service bulletin — ask a dealer.
At what mileage do 2008 Mercedes-Benz C350 electrical problems start?
Half of the complaints with a recorded mileage happened before about 78,000 miles, and 4% before 25,000 miles.
Is it dangerous?
Owners linked 0 crashes, 2 fires and 0 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.