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 2002 Mercedes-Benz C320 owners, lightly cleaned up (personal details are redacted by NHTSA).
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.
Tl* the contact owns a 2002 Mercedes Benz C320. The contact stated that the battery was drained after the vehicle was parked and turned off. The vehicle failed to restart. The vehicle was taken to an independent mechanic to be diagnosed. The contact was informed that the driver's side seat module was defective which caused the battery to drain. The module was unplugged to prevent the battery from being drained. The manufacturer and local dealer were not notified of the failure. The failure mileage was 114,000.
While driving at undetermined speed brake line low light illuminated on the digital dashboard. Consumer pulled over, and exited the vehicle. Front end of the vehicle caught on fire 5 minutes later. After inspection of the vehicle by the manufacturer/dealership, they were unable to locate where the fire originated from.
Tl contact owns a 2002 Mercedes C320. The contact stated that the vehicle would not start. The contact mentioned that after an hour, the vehicle was able to start. The vehicle was not diagnosed or repaired. The failure mileage was 123,384.
While changing one of the lights in the headlight housing, I found the wiring's insulation rotting off all the wires, exposing the bare copper presenting a fire hazard.
On 1/14/2012 car wont start battery dead, call aaa tow truck. Jump battery OK used cared next day and on faul come up on my cars troulbe screen to indicated that I had any other trouble in any system it the car, we when to fl on the on the 16 of January car was home (in ny) son was going to take of house and start car once a week. Received phone call from my son on 1/17/2012 car wont start,battery dead, and key wont turn. On 4/21/2012 come home from fl fround dead car and transmistion leaking.called Mercedes Benz for a toe to the shop.this is thr thired battery since a have this car.battery was under warranty.it was chaneg lest then a year ago. M/b shop informed me battery was dead. Cause my seat modules shorted, to replace modules was cost $1200. I feel that the battery cause this trouble and the the modules should be replaced by b/m at no cost to me.
The light bulbs in my 2002 Mercedes C320 are repeatedly going out. In the last year I have replaced (or had the dealer replace) the trunk light twice, the license plate light twice, both brake lights in the back at least once. In the last 3 months, we've replaced the front left turn signal light 3 times. The dealer cleaned the connectors last week - says that Mercedes knows of a faulty electrical connector problem and an exec at Mercedes was fired over the bad contractor they used. Currently the front left turn signal works sporadically. We'll bring it in to get replaced and it will work, so I drive it home and it stops working again. Now the dealer says I May need to replace the warning software (big $). He suggested I write to you.
I own a Mercedes Benz C320 and lately I've been experiencing some problems, few weeks ago, my car wouldn't start all of a sudden. I jump started and I noticed 2 faults .. ESP warning light and light sensor ,for some reasons something was draining my battery, I went and purchased a brand new battery and 2 days later it did the same thing again, I was told that it was a seat sensor that caused it,s o we unplugged the seats, everyting seamed fine for like 4 to 5 days,while I was driving,the car just came to a complete stop would not move,the engine light came on, I've come to realize that I'm not the only one with this problem, I hope the government would do the right thing by recalling those vehicles.
Both internal seat control modules have electrical fault. Test code 8e3l-k8nnq. Found 1.66 amp of draw (out of spec. Range) amp drop when disconnected: passenger side to: .1114 and driver side: 0.59 milliamps. 1/13 alarm sounds and battery dies. Technician replaces battery, but warns likely to happen again-many cases. 1/16 same problem. Car taken to other m-b dealership. Diagnosed as above. Replaced both modules 1/25. Dealership had trouble getting part due to unusually high volume for this repair. 18 modules gone or on reserve in one week in santa monica alone. Mercedes corporate office unresponsive. Carmax denies known fault, but reports customer with same complaint previous week.
Electrical complaints in other C320 years
Frequently asked questions
How common are electrical problems on the 2002 Mercedes-Benz C320?
NHTSA has 36 complaints about the electrical system of the 2002 Mercedes-Benz C320, 53% of the model year's 68 complaints. The component named most often is 12v/24v/48v battery (4 mentions).
Is there a recall for 2002 Mercedes-Benz C320 electrical problems?
No. NHTSA lists no electrical system recall for the 2002 Mercedes-Benz C320, though it has 3 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 2002 Mercedes-Benz C320 electrical problems start?
Half of the complaints with a recorded mileage happened before about 76,000 miles, and 4% before 25,000 miles.
Is it dangerous?
Owners linked 1 crash, 1 fire and 2 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.