2003 Mercedes-Benz C Class Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 2003 Mercedes-Benz C Class, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Electrical327.3%
- Engine218.2%
- Driver assistance19.1%
- Fuel system19.1%
- Powertrain (other)19.1%
- Airbags19.1%
- Seat belts19.1%
- Heating & air conditioning19.1%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
2003 MERCEDES C240 STALLS IMMEDIATELY AFTER PROLONGED TURNPIKE TRAVEL ( 1.5 HOURS) AT EXIT RAMP TO AN ARTERIAL ROADWAY. THIS INCREASES REAREND ACCIDENT POTENTIAL. MERCEDES CHECKED VEHICLE BUT NO REPORT CODES INDICATED. SUGGESTED THAT IT MAY BE COMPUTER OF SENSOR RELATED. MERCEDES SUGGESTED PULLING OVER FOR 30 MIN. TO LET COMPUTER RESET. FIRST INCIDENT 12/17/08 SECOND INCIDENT 12/28/08. *TR
I OWN A 2003 MERCEDES C240 STATION WAGON WITH ABOUT 42000 MILES, A FEW DAYS AGO I OBSERVED SOME MESSAGES ON DASH WHICH SEEM TO INDICATE ALTERNATOR PROBLEM. MY VEHICLE HAS NOT BEEN HEAVILY USED AND I AM SURPRISED TO LEARN THAT A NEW ALTERNATOR MAY BE NEEDED, THIS BECAUSE A FRIEND WITH C CLASS SEDAN HAS HAD THE SAME ISSUE JUST 2 WEEKS AGO AND COST HIM $1500 TO REPLACE THE ALTERNATOR & BATTERY. I BELIEVE THERE MAY BE MANY MORE FOLKS THAT EXPERIENCED THE SAME SITUATION AND PROBABLY THE C CLASS MERCEDES ARE OUTFITTED WITH FAULTY ALTERNATORS AND INVESTIGATION MAY BE IN ORDER HERE. *JB
Too few reports in this category for a page of its own — they appear in the full complaint list.
Engine
Reports naming the engine itself — including stalling, misfires, oil consumption, cooling and internal engine components.
From owner reports, verbatim
TL* THE CONTACT OWNS A 2003 MERCEDES BENZ C240. THE CONTACT STATED THE COOLANT WAS LEAKING FROM THE RADIATOR INTO THE TRANSMISSION. THE DEALER WAS CONTACTED AND INFORMED HER THAT SHE HAD TO FLUSH THE RADIATOR AND THE TRANSMISSION OR REPLACE THE TORQUE CONVERTER. IF THE FAILURE WAS NOT REPAIRED BY FLUSHING THE SYSTEM, THE TRANSMISSION WOULD NEED TO BE REPLACED FOR OVER $2,000 AT THE CONTACTS EXPENSE. THERE WEE NO RECALLS OR WARRANTIES RELATED TO HER VEHICLE. THE MANUFACTURER WAS CONTACTED BUT OFFERED NO ASSISTANCE. THE FAILURE MILEAGE WAS 70,000. UPDATED 08/31/11 *BF THE CONSUMER HAS TRADED THE VEHICLE. UPDATED 09/07/11.*JB
2003 MERCEDES C240 STALLS IMMEDIATELY AFTER PROLONGED TURNPIKE TRAVEL ( 1.5 HOURS) AT EXIT RAMP TO AN ARTERIAL ROADWAY. THIS INCREASES REAREND ACCIDENT POTENTIAL. MERCEDES CHECKED VEHICLE BUT NO REPORT CODES INDICATED. SUGGESTED THAT IT MAY BE COMPUTER OF SENSOR RELATED. MERCEDES SUGGESTED PULLING OVER FOR 30 MIN. TO LET COMPUTER RESET. FIRST INCIDENT 12/17/08 SECOND INCIDENT 12/28/08. *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Driver assistance
Reports naming forward-collision avoidance, lane keeping, back-over prevention, cruise control and related electronic driver-assistance systems.
From owner reports, verbatim
TL*THE CONTACT OWNS A 2003 MERCEDES C240. SHE STATED THAT HER VEHICLE WOULD NOT ACCELERATE FAST ENOUGH TO SAFELY MERGE IN AND OUT OF TRAFFIC. THE MANUFACTURER STATED THAT THEY WOULD BE UNABLE TO ASSIST HER AND THEY WOULD NOT ACCEPT THE EXTENDED WARRANTY. THE CONTACT STATED THAT SHE WOULD FILE A COMPLAINT WITH THE STATE ATTORNEY GENERALS OFFICE DUE TO HER VEHICLE BEING A LEMON. THE FAILURE WAS 77 AND THE CURRENT MILEAGE WAS 40,900.
Too few reports in this category for a page of its own — they appear in the full complaint list.
Fuel system
Reports naming fuel storage or delivery — tanks, pumps, lines, injectors and fuel leaks.
From owner reports, verbatim
MY 2003 C240 MERCEDES PILOT BUSHING IS EXPERIENCING HEAVY OIL LEAK - THERE IS A CURRENT RE-CALL ON SAME ISSUE WITH OTHER MODELS. THE DEALER I USE TO SERVICE MY CARE, REFUSE TO REPAIR BECAUSE THEY SAID MY MODEL IS NOT INCLUDED IN THE RE-CALL. 2ND ISSUE - MY DRIVER SIDE DOOR HANDLE IS BROKEN BECAUSE OF MANUFACTURE DEFECTS . SOMETIMES HARD TO OPEN AND HAVE TO USE OTHER DOOR TO GET INTO CAR, DEALER REFUSE TO REPLACE THE DEFECT HANDLE WITH GOOD HANDLE. *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Powertrain (other)
Powertrain reports that are not specifically the engine or transmission — driveshafts, axles, transfer cases and differentials.
From owner reports, verbatim
MY MERCEDES-BENZ C-240 (2003 MODEL), HAVING LESS THAN 18500 MILES, SUDDENLY LOST POWER AFTER SOME 2-HOUR WORTH OF FREE-WAY DRIVING. AROUND NOON ON FRIDAY, 8/26/05, I WAS DRIVING SOUTH -BOUND ON I-15 PAST VICTORVILLE (CA), ABOUT 9 MILES PAST THE EXIT FOR ROUTE 18, WHEN MY C-240 SUDDENLY LOST POWER. AS I DEPRESSED THE ACCELERATOR, I FELT NO POWER AND THE RPM WAS DECREASING. IT FELT LIKE THE ENTIRE ENGINE-TRANSMISSION SYSTEM WAS SHUTTING DOWN. THERE WAS NO PRIOR WARNING. I MADE RIGHT TURN SIGNAL LETTING OTHER VEHICLES KNOW I WAS COMING OFF THE FREE-WAY. I MANAGED TO PULL OFF TO THE RIGHT SHOULDER SAFELY AND CAME TO FULL STOP ON THE GRAVEL. AT THAT TIME, MY DIGITAL ODOMETER READ "1 MALFUNCTION". USING MY CELL PHONE, I IMMEDIATELY CALLED THE MERCEDES HOTLINE. THE ROADSIDE ASSISTANCE REPRESENTATIVE, KRISTIN, ADVISED ME NOT TO DRIVE THE VEHICLE, EVEN AFTER THE "1 MALFUNCTION" SIGN BECAME "NO MALFUNCTION" A LITTLE LATER. MY VEHICLE WAS TOWED TO A MERCEDES-BENZ DEALER IN RIVERSIDE, SOME 50 MILES AWAY. AT THE DEALERS SERVICE DEPT, AFTER A BASIC CHECK INVOLVING COMPUTER AND ELECTRONICS, SOME FAULTY IDENTIFICATIONS WERE MADE, BUT IT WAS DETERMINED TO BE SAFE AND DRIVABLE. I DROVE MY VEHICLE HOME, PLANNING TO HAVE A MAJOR CHECK UP LATER. *JB
Too few reports in this category for a page of its own — they appear in the full complaint list.
Airbags
Reports naming the air-bag system — deployment behaviour, inflators, sensors and warning lights.
From owner reports, verbatim
TL*THE CONTACT OWNS A 2003 MERCEDES BENZ C240. THE CONTACT STATED WHILE DRIVING 15 MPH THE VEHICLE IN FRONT OF HIM SUDDENLY STOPPED CAUSING HIM TO CRASH INTO THE REAR OF THE VEHICLE. THE PASSENGER SEAT BELT DID NOT HOLD THE PASSENGER IN THE FRONT SEAT WHICH CAUSED HER HEAD TO HIT THE WINDSHIELD. BOTH THE DRIVER AND PASSENGER SIDE AIR BAGS DID NOT DEPLOY. THE VEHICLE WAS DESTROYED. THE PASSENGER WAS TAKEN TO THE HOSPITAL FOR A HEAD INJURY. A POLICE REPORT WAS FILED. THE VEHICLE WAS TOWED BY THE INSURANCE COMPANY. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 20,000. UPDATED 07/08/11 *BF
Too few reports in this category for a page of its own — they appear in the full complaint list.
Seat belts
Reports naming seat belts, buckles, retractors and pretensioners.
From owner reports, verbatim
TL*THE CONTACT OWNS A 2003 MERCEDES BENZ C240. THE CONTACT STATED WHILE DRIVING 15 MPH THE VEHICLE IN FRONT OF HIM SUDDENLY STOPPED CAUSING HIM TO CRASH INTO THE REAR OF THE VEHICLE. THE PASSENGER SEAT BELT DID NOT HOLD THE PASSENGER IN THE FRONT SEAT WHICH CAUSED HER HEAD TO HIT THE WINDSHIELD. BOTH THE DRIVER AND PASSENGER SIDE AIR BAGS DID NOT DEPLOY. THE VEHICLE WAS DESTROYED. THE PASSENGER WAS TAKEN TO THE HOSPITAL FOR A HEAD INJURY. A POLICE REPORT WAS FILED. THE VEHICLE WAS TOWED BY THE INSURANCE COMPANY. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 20,000. UPDATED 07/08/11 *BF
Too few reports in this category for a page of its own — they appear in the full complaint list.
Heating & air conditioning
Reports naming the heating, ventilation and air-conditioning system.
From owner reports, verbatim
WHILE DRIVING WITH A/C SET ON "AUTO" THE A/C SYSTEM WOULD SUDDENLY TURN OFF BY ITSELF AND WOULD TURN OF REPEATEDLY WHEN STARTED AGAIN. DURING SUCH EPISODES THE A/C WOULD ACT ERRATIC WITH FANS TURNING ON AND OFF AT DIFFERENT OUTLETS, CYCLES BETWEEN HEATING AND COOLING, AND MAKES HISSING SOUNDS. THIS WOULD OCCUR MANY TIMES A DAY ON A DAILY BASIS IN SUMMER WEATHER (EXCEPT WHEN THE CAR IS TAKEN TO THE DEALER, IT SEEMS). IT TOOK ABOUT 2 YEARS FOR THE DEALER TO FINALLY FIX THE PROBLEM SINCE THEY COULD NOT AVOID ADMITTING ITS EXISTENCE AFTER I HAD VIDEO TAPED THE MALFUNCTION AND SHOWED THEM THE VIDEO.. *JB
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .