2003 Mercedes Benz C320 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
22 owner complaints analyzed
3 distinct recall campaigns
54,352 mi median reported failure mileage
Scope: 2003 model year. Data snapshot: . 15 complaints include usable failure mileage.
Most common problems
Electrical System is the most frequently named component, appearing in 5 of 22 complaints (22.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Electrical and battery issues | 5 | 22.7% |
| Transmission and shifting | 4 | 18.2% |
| Braking behavior | 4 | 18.2% |
| Engine operation | 2 | 9.1% |
| Steering behavior | 2 | 9.1% |
| Fuel system concerns | 2 | 9.1% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Electrical System | 5 |
| Air Bags | 4 |
| Power Train | 4 |
| Exterior Lighting | 2 |
| Vehicle Speed Control | 2 |
| Visibility:Sun/Moon Roof Assembly | 2 |
| Electrical System:Wiring | 1 |
| Electrical System:Wiring:Interior/Under Dash | 1 |
Electrical System: 5; Air Bags: 4; Power Train: 4; Exterior Lighting: 2; Vehicle Speed Control: 2; Visibility:Sun/Moon Roof Assembly: 2; Electrical System:Wiring: 1; Electrical System:Wiring:Interior/Under Dash: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 2 |
| 25,000 to 49,999 | 3 |
| 50,000 to 74,999 | 4 |
| 75,000 to 99,999 | 2 |
| 100,000 to 149,999 | 2 |
| 150,000 and above | 2 |
Under 25,000: 2; 25,000 to 49,999: 3; 50,000 to 74,999: 4; 75,000 to 99,999: 2; 100,000 to 149,999: 2; 150,000 and above: 2
50,000 to 74,999 miles has the most reports with usable mileage (4). 7 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2002 | 1 |
| 2003 | 2 |
| 2007 | 1 |
| 2008 | 3 |
| 2009 | 1 |
| 2010 | 2 |
| 2011 | 1 |
| 2013 | 1 |
| 2014 | 2 |
| 2016 | 2 |
| 2017 | 1 |
| 2020 | 1 |
| 2023 | 2 |
| 2024 | 1 |
| 2026 | 1 |
2002: 1; 2003: 2; 2007: 1; 2008: 3; 2009: 1; 2010: 2; 2011: 1; 2013: 1; 2014: 2; 2016: 2; 2017: 1; 2020: 1; 2023: 2; 2024: 1; 2026: 1
Pattern summary
Electrical System leads the component reports. Electrical and battery issues appears in 5 complaint narratives. Transmission and shifting appears in 4 complaint narratives. Braking behavior appears in 4 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 10239042 · 2008-08-20 (August 20, 2008)
DURING THE FIVE YEARS WE HAVE OWNED THE CAR IT HAS HAD NUMEROUS ELECTRICAL PROBLEMS. ON AT LEAST 5 OCCASIONS ALL FUNCTION OF THE DASHBOARD WENT OUT WHILE DRIVING. WHEN THE CAR WAS RESTARTED EVERYTHING WAS FINE. SEAT CONTROLS HAVE BEEN REPLACED SEVERAL TIMES, AND THEY STILL OPERATE INTERMITTENTLY. THERE IS NO PROBLEM WITH THE BATTERY. THERE IS A SHORT SOMEPLACE, AND THE DEALER KEEPS SAYING THEY CAN'T FIX IT IF THEY CAN'T SEE IT. *TR
Owner-reported narrative. Look up ODI 10239042 at NHTSA ↗
Owner report 10241799 · 2008-09-11 (September 11, 2008)
I PURCHASE MY 2003 MERCEDES FROM CARMAX IN 2 YEARS AGO. IT HAD 45,000 MILES WHEN I PURCHASED IT. FROM THE TIME I PURCHASE THIS CAR I HAD TO REPLACE THE SUNROOF MOTOR, REPLACE THE SHOCKS, REPLACE THE TRUCK LOCK, REPLACE THE FUEL TANK, AND I HAD SOME TRANSMISSION WORK DONE. MY BIGGEST PROBLEM IS HAVING TO REPLACE THE LOW BEAM LIGHTS EVERY 6 MONTHS. I SUSPECT THERE IS AN ELECTRICAL PROBLEM, BUT CANNOT COMPLETELY PROVE IT WITH THE MANUFACTURER. WITH 1 YEAR, I HAD TO REPLACE THE BULBS 3 TIMES. I HAD TO REPLACE THE FRONT LOW BEAM BULBS AND THE BRAK…
Owner-reported narrative. Look up ODI 10241799 at NHTSA ↗
Owner report 10197622 · 2007-07-27 (July 27, 2007)
THIS HAPPENED IN MY 2003 C320 AT 54,000 MILES. I INITIALLY NOTICED A LIGHT RUBBING OR GRINDING WHILE ACCELERATING, WITH LIGHT VIBRATION. AT THE DEALERSHIP I WAS TOLD I WOULD NEED A NEW TORQUE CONVERTER, NEW RADIATOR, AND A FLUID FLUSH. THE RADIATOR FLUID WAS MIXING WITH THE TRANSMISSION FLUID. AFTER THOSE REPAIRS, MY C320 WAS STILL SHIFTING HARD AND THE GRINDING NOISE WAS STILL THERE. IT TURNS OUT THE TRANSMISSION WAS RUINED AS WELL. TWO REPLACEMENT TRANSMISSIONS WERE NEEDED UNTIL IT WAS READY TO BE PICKED UP. I'VE BEEN TOLD THAT THE MI…
Owner-reported narrative. 54,352 miles reported. Look up ODI 10197622 at NHTSA ↗
Owner report 10837074 · 2016-02-19 (February 19, 2016)
BRAKING SYSTEM FAILURE MY WIFE WAS DRIVING TO WORK. SHE ATTEMPTED TO STOP AT AN INTERSECTION, HER FOOT WENT TO THE FLOOR WHILE BRAKING, RED LIGHT AND WARN BUZZER WENT OFF... NO BRAKES. LUCKILY AND THANK GOD, SHE AVOIDED BEING T-BONED IN THE INTERSECTION AND WAS ABLE TO GET IT INTO A PARKING LOT AND DOWN SHIFT TO USE E-BRAKE. THE CAR HAS ONLY 70,000MILES ON IT. THE REPAIR OF THE SYSTEM SOUNDS LIKE IT IS $2500+. NOT HAPPY AT ALL SINCE MB KNOWS IT IS A PROBLEM AND SHOULD HAVE A REPLACEMENT BRAKING SYSTEM FOR IT OR REPAIR. THIS IS NOT JUST A OLD M…
Owner-reported narrative. 70,000 miles reported. Look up ODI 10837074 at NHTSA ↗
Owner report 10285432 · 2009-09-27 (September 27, 2009)
ON A 2003 C 320 MBNZ, THE RADIATOR NOW LEAKS INTO THE TRANSMISSION. THIS IS GOING TO REQUIRE THE RADIATOR TO BE REPLACED AND FOR THE TRANSMISSION TO BE FLUSHED. THIS LEAKING RADIATOR FLUID COULD HAVE ALREADY DAMAGED THE TRANSMISSION, AND IF SO, IT WILL HAVE TO BE REPLACED. THIS PROBLEM CAUSES A LACK OF POWER AND THEREFORE A LOSS OF ACCELERATION. IT HAPPENS WITHOUT ANY WARNING, OFTEN LEAVING YOU VULNERABLE DUE TO THE LOSS OF POWER, A POTENTIAL ACCIDENT WAITING TO HAPPEN. *TR
Owner-reported narrative. 47,115 miles reported. Look up ODI 10285432 at NHTSA ↗
Owner report 10508867 · 2013-04-19 (April 19, 2013)
I HAVE A 2003 C 320 MBNZ, THE RADIATOR LEAKS INTO THE TRANSMISSION. THE RADIATOR NEEDS TO BE REPLACED. THIS LEAKING RADIATOR FLUID DAMAGED THE TRANSMISSION, AND IT HAS TO BE REPLACED. THIS PROBLEM CAUSED A LACK OF POWER AND THEREFORE A LOSS OF ACCELERATION. IT HAPPENED WITHOUT ANY WARNING, LEAVING YOU VULNERABLE DUE TO THE LOSS OF POWER, A VERY DANGEROUS SITUATION WHICH MAY CAUSE AN ACCIDENT. THE CAR HAS ONLY 50026 MILES ON IT. *TR
Owner-reported narrative. 50,026 miles reported. Look up ODI 10508867 at NHTSA ↗
Owner report 10017641 · 2003-06-09 (June 9, 2003)
THE POWER STEERING WAS TIGHT AND IT WAS DIFFICULT TO CONTROL THE STEERING WHEEL. *JB *TT
Owner-reported narrative. Look up ODI 10017641 at NHTSA ↗
Owner report 10248246 · 2008-11-10 (November 10, 2008)
CAR SEAT AND STEERING WHEEL WOULDN'T ADJUST WITH THE KEY PUT IN THE IGNITION..THIS WENT ON FOR THREE DAYS...THEN THE CAR DIED..HAD TO GET A JUMP..THE SERVICE REP SAYS THE MODEL# 320 C HAS A PROBLEM WITH THE SEAT MODULE FAILING ON THE PASSENGER AND DRIVERS SIDE..WHEN THE CAR WAS JUMPED ALL ELECTRICAL WAS WORKING PROPERLY AND FIND...TOOK TO DEALER AND THEY INFORMED ME THAT YES THE PASSENGER SEAT MODULE WAS BAD AND ALSO NEEDED A NEW BATTERY..THEY ALSO STATED THAT THE DRIVERS SEAT MODULE COULD GO OUT WITHIN THE NEXT FEW MONTHS...THE CAR ONLY HAS 13…
Owner-reported narrative. 13,703 miles reported. Look up ODI 10248246 at NHTSA ↗
Owner report 11020951 · 2017-08-31 (August 31, 2017)
MERCEDES BENZ POSSIBLE RECALL / EXTENDED WARRANTY FOR FUEL SYSTEM... INVOLVING A C CLASS 2003 WITH SAME ENGINE AS THE E CLASS. THE CAR FUEL SYSTEM IS TOTALLY MESSED UP, WILL ONLY FILL A HALF TANK AND RUNS OUT OF GAS BECAUSE THE FUEL TANK SYSTEM IS NOT WORKING CORRECTLY. CAR WILL NOT FILL. ONLY ONE TANK TAKING AND SENDING FUEL APPARENTLY. DASH IS MESSED UP, LIGHTS OUT, FUEL SYSTEM TOTALLY MESSED UP. I ALMOST WENT OFF A CLIFF IN THE CAR, SLID BACKWARDS ON A HILLSIDE WHEN THE CAR RAN OUT OF FUEL UNEXPECTEDLY. NO GAS, NO POWER, MY CAR WENT BA…
Owner-reported narrative. 170,000 miles reported. Look up ODI 11020951 at NHTSA ↗