Electrical complaints by model year
Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
What owners report
The contact owns a 2003 Mercedes-Benz C320. The contact stated that the sunroof had failed to open, and the sunshade cover failed to close, causing the sunrays to penetrate the vehicle. The vehicle was taken to the dealer, where an unknown assessment was made. The vehicle was not repaired. Additionally, the contact stated that the horn was inoperable. The SRS warning light was illuminated. The vehicle was taken to an independent mechanic, where it was diagnosed with front driver's side air bag failure. The vehicle was not repaired. The manufacturer was notified of the failure and referred the contact to the NHTSA Hotline for assistance. The failure mileage was approximately 124,000.
The secondary instrument fuse block located on the driver's side of the dashboard erupted in flame while the vehicle was being driven, endangering its occupant, causing significant damage to its interior, and resulting in a local law enforcement "traffic hazard" determination.
Battery drains after being parked overnight, 58,000 miles, dealer maintained since new. Driven by a little old lady until I bought it. Took it to the dealer and they replaced one of the seat modules. Soon afterward, the problem recurred. Took it back to the dealer and they said it was a defective fuse box and replaced it for $650. Went to pick up the car and the battery was dead again. After some complaining, they refunded the bill. They looked at it again and said the problem was somewhere in the dashboard and it would cost $2300 just to take it apart and look for a bad module. They offered $2300 trade in toward a new or CPO car, and said my car would be sent to the crusher. I took the car back and installed a remote operated battery cutoff, and have been driving it ever since. Other than disturbing the engine computer, it's been running well for three years and 20,000 miles. …
Was driving on highway when ESP, bas and ABS lights show up, and speedometer display stops working - speed reading goes to zero, though there is no reduction in speed. Get to destination. On return it happens again. This time I go to rest area, stop the car, remove the key and restart. The car refuses to move out of park. Call roadside assistance and get instruction to override park, drive home with flashers on - very rough ride quality. Tow to dealer next day, they are not sure if new part will fix it, even if $1850 part is replaced. Lots of electrical problems over the years. Turn lights go out routinely. Changed cd changer. Seat drains battery,had to disconnect it. Poor electrical sensors all around. Now it also has rust damage, all of a sudden, at the bottom of doors.
I just bought the car and two days later the Smart key won't turn, can't unlock the steering wheel and the shiffter the good think the car was parked on my drive way call tow truck take to the shop and they say I need a new key and ignition control module but only dealer can do that, $1,400.00 dollars job
Intermittent horn - 2001 Mercedes Benz C320 I turn to you for any help and/or advice you can provide. While on an interstate driving my horn goes off. It was humorous at first as I thought it was someone else. The horn sounded constantly for about 15 minutes then went off for the next hour whenever it felt like it. No error codes were displayed on the console. No horn problem the next day. Gave the wife the car she drives to work - no problem. Get off from work, into the car, starts it up....the horn goes off again. Not humorous anymore, the wife did not find it funny. Took the car to the dealer, valley motors, inc, cockeysville, maryland the next morning waited 5 hours and was told they could not duplicate the problem. But charged me $90 in labor. Started the car to run an errand....horn goes off! Drive directly to the dealer. …
Frequently asked questions
Which Mercedes-Benz C320 years have electrical problems?
By NHTSA complaints, the 2002 (36), 2001 (26) and 2003 (7) model years. Electrical complaints make up 53% of all complaints for the 2002.
Is there a recall for Mercedes-Benz C320 electrical problems?
No. NHTSA lists no electrical system recall for any Mercedes-Benz C320 model year. A widespread problem may still be covered by an extended warranty or a manufacturer service bulletin, so ask a dealer.
At what mileage do Mercedes-Benz C320 electrical problems start?
Across all years, half of the complaints with a recorded mileage happened before about 74,000 miles; 19% happened before 50,000 miles.
What part fails most often?
Owners most often name the 12v/24v/48v battery (4 mentions), followed by the ignition (2).
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.