2001 Mercedes-Benz C320 Problems
- Complaints
- 63filed with NHTSA
- Median mileage
- 70,000miles, 48 complaints with mileage
- Recalls
- 3campaigns on record
- Trend
- FallingComplaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
- NHTSA crash rating
- —overall rating starts with 2011 models
- EPA fuel economy
- 19 mpgcombined, 3.2L 6-cyl RWD · 17 city / 23 hwy
Sources: NHTSA records for the 2001 Mercedes-Benz C320 (complaints, recalls, investigations), EPA fuel economy. Report an error
What owners report
Owners of the 2001 C320 most often describe a battery that goes flat overnight or after a day or two of sitting, traced by dealers and independent shops to the power seat control modules drawing current with the key off. A second recurring theme is the engine quitting while driving, which complaints commonly link to the crank position sensor. Reports span a wide mileage range, roughly from the 30,000s to well past 100,000 miles, and the trend of filings is falling.
- Seats
Battery drains when parked (seat control modules)
- 20 complaints (32%)
- median 77,500 mi at 9.4 yrs old (16 state mileage)
- 1 mention a crash, fire or injury
- filed 2006–2016
Owners describe returning to a car that will not start after it sat overnight or for two or three days, sometimes needing repeated jump starts. Shops and dealers traced the draw to the driver or passenger seat control module, and in several accounts unplugging the seat or its fuse stopped the drain but left the seat unadjustable. Quoted repairs for the modules run into the high hundreds to around $1,100, and some owners report the replacement failing again within about a year. Reported across a wide range, commonly from about 45,000 to 130,000 miles, and generally after the car has been left standing for a day or more.
What to check: Ask whether the seat control modules were replaced and whether the seats were ever unplugged to stop a drain. Have a shop measure parasitic draw with the key off, or watch the battery voltage over a couple of days if the car is left parked.
2 excerpts from owner complaints in NHTSA records
“My 2001 Mercedes-Benz C320's battery was constantly going bad and having to be jumped after not starting it or driving it for approx. 24 hours. Finally, after a certified mercedes mechanic investigated the problem, he informed me that the problem originated from the driver's seat module, which was draining my battery. He informed me that if I unplugged it for the time being, my battery would no longer drain. Sure enough, after unplugging the seat module, I no longer had issues with my battery draining. …”
NHTSA complaint #10585499, filed 2014-04, 75,000 miles“I have a 2001 mercedes C320 which I can't really drive anymore because the battery drains every day, the problem is the power seat controller, it drains the battery really quickly.”
NHTSA complaint #10245849, filed 2008-10, 70,000 miles - Electrical system
Electrical faults and warning lights (SAM modules, cluster)
- 13 complaints (21%)
- median 57,259 mi at 4.9 yrs old (10 state mileage)
- 1 mention a crash, fire or injury
- filed 2002–2014
Owners describe clusters of electrical oddities: modules that stop working, malfunction messages that appear with no fault present, keys and remotes that intermittently fail to communicate, lights that need repeated bulb or harness replacement, and a horn that sounded on its own. Repairs commonly involved replacing front or rear SAM control modules, the ignition switch or electronic key, and in one case the multi-function display faded in summer heat. Costs reported for these repairs are high, and some owners describe the same fault returning. Reported from very low mileage up to the 100,000s, with several accounts under 60,000 miles.
What to check: Check that all interior electronics, the key and remote, windows, mirrors and the instrument display work, and ask whether any SAM module or the ignition switch has been replaced.
2 excerpts from owner complaints in NHTSA records
“At 55,178 miles (only 5,000 over warranty) I had to have my faulty electronic ignition system replaced. During this repair at an authorized dealership, the technicians blew out the rear sam (computer controlling directional signals, hazard lights, etc), while the car was in their shop. They attempted to make me believe that the rear sam failure was an underlying failure that they were not able to detect with the first inspection. …”
NHTSA complaint #10182491, filed 2007-02, 55,168 miles“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. …”
NHTSA complaint #10073090, filed 2004-05, 80,069 miles - Engine cooling
Engine stalls or shuts off while driving
- 5 complaints (8%)
- median 66,570 mi at 8.0 yrs old (5 state mileage, few)
- filed 2004–2011
Complaints describe the engine cutting out without warning at highway speed or in traffic, with a loss of power steering assist, and then restarting normally afterward in some cases. Dealers that could reproduce it pointed to a faulty crank position sensor, and in some accounts the engine control module; other owners were told the problem could not be duplicated. Several report paying for the sensor replacement themselves. Mostly reported between roughly 30,000 and 80,000 miles, typically at steady highway speeds.
What to check: Ask for service records showing whether the crank position sensor has been replaced, and note any stored engine codes at a pre-purchase scan.
2 excerpts from owner complaints in NHTSA records
“On the first occasion (december 16, 2010), my mercedes C320 electrical system shut down the engine while I was driving. The car engine shut off as I was driving 57 MPH on the freeway during morning rush hour. There were several cars and tractor trailers behind me when the car shut off as I was driving. The incident was terrifying, as no warning lights (nothing) came on in the car. Luckily, other drivers saw me in distress and I was able to maneuver over three lanes of traffic to get to the side strip. …”
NHTSA complaint #10441923, filed 2011-12, 70,000 miles“While operating on the highway and in traffic, the vehicle stalls suddenly and without warning because of a 'crank position sensor'. The sensor is a magnet which, when it determines the crankshaft is out of alignment, abruptly shuts down the fuel system. Subsequent models of this manufacturers product do not allow the sensor to do this, but rather indicate a possible problem with a warning light. This sensor system is extremely hazardous and could result in significant injury.”
NHTSA complaint #10247535, filed 2008-11, 66,570 miles - Brakes
Brakes applying or fading unexpectedly (ESP/BAS)
- 8 complaints (13%)
- median 108,000 mi at 11.8 yrs old (7 state mileage, few)
- 1 mention a crash, fire or injury
- filed 2004–2015
Complaints describe a front brake grabbing on its own at speed and then releasing, or the pedal going to the floor, with ESP and BAS warnings on the dash. Diagnosis in several cases pointed to the yaw rate sensor or the brake light switch, and in one account the brake light switch was replaced twice without resolving it. Another owner reported a master cylinder failure and one described weak brake assist after a cold start. Spread from about 30,000 to 185,000 miles, mostly at highway speeds.
What to check: Ask whether the yaw rate sensor and brake light switch have been replaced, and have the ESP/BAS system scanned for stored codes before buying.
2 excerpts from owner complaints in NHTSA records
“Dt: car has had several problems from air bags to brakes to alternator. Owner doesnt think he should have to pay for these repairs, actually the main concern he has is about the warranty. Upon purchase, the vehicle air bag lights came on, then the brakes and alternator went out as well. The brakes failed due to a master cylinder failure. The alternator failed after the owner installed a new battery.”
NHTSA complaint #10126338, filed 2005-06, 53,867 miles“Consumer was pulling inside of a parking space to park and vehicle suddenly accelerated uncontrollably. Consumer applied the brakes and pedal went to the floor. Then, vehicle continued to accelerate with speed, jumped the curb,and crashed into a parked vehicle head on. Upon impact, both frontal air bags did not deploy. No injuries reported. Consumer was able to drive the vehicle to the dealer for inspection, but mechanic could not duplicate the problem.”
NHTSA complaint #10103381, filed 2004-12, 29,943 miles
Buying note. A pre-purchase scan for stored engine, ESP and body-control codes plus a parasitic draw test will tell you the most about a 2001 C320, since the seat-module drain and the crank sensor are the two faults owners mention most. Ask for records of the sunroof recall and any module replacements, and budget for electrical repairs on a car of this age.
Summary written with AI from a sample of 57 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.
NHTSA recorded 63 consumer complaints for the 2001 Mercedes-Benz C320. 48 of the complaints include a mileage, and 25% of those were filed for vehicles with under 50,000 miles; the median is 70,000 miles. Of all complaints, 3 involved a crash, 1 a fire, according to the filers. NHTSA lists 3 recall campaigns and 38 technical service bulletins for this model year.
Not compared (before 2008). Model years 2008–2023 of the same vehicle that have at least 25 complaints are compared, and a model needs at least 3 of them.
Which parts are reported most
Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.
- Electrical system26 41%
- Seats19 30%
- Engine cooling11 17%
- Brakes8 13%
- Exterior lighting7 11%
- Equipment5 7.9%
- Fuel system5 7.9%
- Vehicle speed control5 7.9%
- Steering4 6.3%
Also reported: Air bags (3), Electronic stability control (3), Body and structure (3), Other or unknown (2), Suspension (2), Engine (1), Latches, locks and linkages (1), Tires (1), Transmission and drivetrain (1).
Example complaints
Electrical system: “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”
NHTSA complaint #10861059, filed 2016-04, 109,042 milesSeats: “I purchased this car as a graduation present for my daughter. I know it's and older model, and has high mileage, so I expected some issues. However, after reading several post across the internet it seems as if the seat module issue is a problem. Everytime she lets the car sit for more than a day, it won't start. She has to jump start the car, and this seems to be an issue across the board that benz should have recalled by now. This is a major issue and something needs to be done. This morning the card once again would not start. …”
NHTSA complaint #10460130, filed 2012-05, 154,000 milesEngine cooling: “Malfunctioning seat control modules drain battery in 2001 C320 mercedes benz. Not long after purchasing the car in january 2008 with 51,000+ miles, I paid $175 dollars for a new mbz battery, before asking dealership to disconnect seat control modules. I was not prepared to pay $1200 to replace modules. June 25, 2010, my 2001 C320 stopped during a trip to phoenix, az from california, due to fuel pump going out. My 79 year-old mother and I waited in 100+ degree weather for a tow, which took 3 hours to get to phoenix mbz dealership. …”
NHTSA complaint #10352334, filed 2010-08, 102,211 milesBrakes: “At 55 MPH the front left brake engages without applying the brake pedal and after a few seconds releases, the bas and ESC faults are then visible on the dash. The brake light switch was replaced by mercedes two times, but this condition shows up after a few days of driving , codes show that the yaw rate sensor or connection is at fault. Even when the car is in park with the engine running on a flat level surface the fault warning dash lights ESC and bas will come on with no movement in the car. This is a very dangerous situation for a collision from a vehicle following me and running into me . …”
NHTSA complaint #10618834, filed 2014-08, 57,000 milesMileage when problems were reported
25% of the 48 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 50,500 and 99,000 miles.
Complaints by year filed
Trend: falling. Complaints filed in the last 3 full calendar years are at least 25% lower than in the 3 years before.
Fuel economy and running cost
EPA ratings for each 2001 Mercedes-Benz C320 version. Annual fuel cost is the EPA's estimate at its current fuel prices for 15,000 miles a year (55% city driving).
| Version | Engine | Transmission | City | Hwy | Comb. | Fuel / yr |
|---|---|---|---|---|---|---|
| C320 RWD | 3.2L 6-cyl | 5-speed automatic | 17 | 23 | 19 | $4,350 |
Source: U.S. EPA and Department of Energy, fueleconomy.gov. Ratings are for comparing vehicles; real-world mileage varies with driving and conditions.
Recalls and investigations
- 24V874000Nov 19, 2024Visibility › Sun/moon roof assemblyCovers: Mercedes-Benz C320 2001–2005, E320 2003–2009, C230 2002–2007 +20 more
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2001-2011 C-Class, CLK, E-Class, and CLS vehicles. Please see the recall report for a complete list of models and model years. The glass sunroof panel may not be properly secured and can detach.
- 22V954000Dec 23, 2022Visibility › Sun/moon roof assemblyCovers: Mercedes-Benz C320 2001–2005, C230 2002–2007, CLS550 2006–2011 +18 more
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2001-2011 C-Class, CLK, E-Class, and CLS vehicles. Please refer to MBUSA's recall report for specific vehicle model details. The glass sunroof panel may not be properly secured and may detach.
- 19V918000Dec 20, 2019Visibility › Sun/moon roof assemblyCovers: Mercedes-Benz C320 2001–2005, E320 2003–2009, C230 2003–2007 +21 more
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2001-2011 vehicles. The bonding between the glass panel and the sliding roof frame may deteriorate, possibly resulting in the glass panel detaching from the vehicle. For a full list of the affected models…
Recall details for the 2001 Mercedes-Benz C320 → · Check a VIN at nhtsa.gov/recalls
Technical service bulletins
TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 38 on record; the latest 10 are shown.
- 11025648Nov 15, 2025Transmission and drivetrain. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa)…
- 11019018May 21, 2025Transmission and drivetrain. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa)…
- 11017500Apr 28, 2025Exterior lighting. Complaint Headlamps leaking or fogged Cause The fogging of the headlamp is a natural phenomenon which can occur under certain climatic conditions. In contrast to a leaky headlamp, physical fogging…
- 11017496Apr 28, 2025Exterior lighting. Complaint Headlamp, front fog lamp leaky or fogged Cause Fogging of the headlamps is a natural phenomenon, which can occur under certain climatic conditions. It does not lead to any technical…
- 11017039Apr 1, 2025Engine. Complaint Vehicle with atypical reduced heat output. Cause Silicate granulate may have escaped from a damaged bag in the expansion reservoir (not visible), reducing the coolant flow in the heater…
- 11015640Mar 5, 2025Electrical system. Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party during a call. It becomes…
- 11013298Jan 16, 2025Transmission and drivetrain. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once when changing from forward to reverse (and vice versa)…
- 11013332Jan 15, 2025Transmission and drivetrain. Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once in each instance when changing direction of travel. Note…
- 11009122Oct 23, 2024Visibility (wipers, defrost, mirrors), Body and structure. Complaint Washer fluid system leaks Cause Various possible causes: 1. Washer fluid reservoir itself. 2. Seal on washer fluid pump/washer fluid reservoir. 3. Washer fluid pump. 3.1. Distributor…
- 11008091Sep 28, 2024Electrical system. Complaint During a phone call, the called party has difficulty understanding/cannot understand the driver, or interference/background noises are audible to the called party during a call. It becomes…
Other model years of the Mercedes-Benz C320
| Year | Complaints | Median mi | Recalls | Crash ★ | MPG | Score (50 = typical) | Trend |
|---|---|---|---|---|---|---|---|
| 2005 | 15 | 96,234 | 4 | — | 19 | — | Falling |
| 2004 | 15 | 64,500 | 3 | — | 20 | — | Falling |
| 2003 | 22 | 54,352 | 3 | — | 19 | — | Rising |
| 2002 | 68 | 70,000 | 3 | — | 19 | Not compared (before 2008) | Rising |
| 2001 | 63 | 70,000 | 3 | — | 19 | Not compared (before 2008) | Falling |
All Mercedes-Benz C320 model years
Frequently asked questions
What are the most common problems with the 2001 Mercedes-Benz C320?
Owners of the 2001 C320 most often describe a battery that goes flat overnight or after a day or two of sitting, traced by dealers and independent shops to the power seat control modules drawing current with the key off. The issues reported most often: Battery drains when parked (seat control modules); Electrical faults and warning lights (SAM modules, cluster); Engine stalls or shuts off while driving.
How many NHTSA complaints does the 2001 Mercedes-Benz C320 have?
NHTSA recorded 63 consumer complaints for the 2001 Mercedes-Benz C320 as of Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
What part of the 2001 Mercedes-Benz C320 is reported most often?
Electrical system is named most often, in 26 complaints (41% of the total), followed by seats with 19.
Has the 2001 Mercedes-Benz C320 been recalled?
NHTSA lists 3 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.
What gas mileage does the 2001 Mercedes-Benz C320 get?
The EPA rates the 2001 Mercedes-Benz C320 (C320, 3.2L 6-cyl) at 19 mpg combined, 17 city and 23 highway, with an estimated annual fuel cost of $4,350 at 15,000 miles a year. Other engine and drive versions are rated differently.
At what mileage are problems with the 2001 Mercedes-Benz C320 reported?
Among the 48 complaints that include a mileage, the median is 70,000 miles and the middle half falls between 50,500 and 99,000 miles; 25% were filed for vehicles with under 50,000 miles.
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate. Fuel economy is from the EPA and DOE (fueleconomy.gov).
Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.