2005 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 2005 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
- Interior & seats225.0%
- Driver assistance112.5%
- Electrical112.5%
- Airbags112.5%
- Other / unspecified112.5%
- Powertrain (other)112.5%
- Transmission112.5%
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
Interior & seats
Reports naming seats, latches, locks, linkages and interior fittings.
From owner reports, verbatim
DRIVER'S SIDE SEAT BACK, LEFT BOLSTER, STARTED TO SMOKE AND BURNED A DIME SIZE HOLE IN THE LEATHER SEAT COVER. DRIVER'S SEAT HEAT WAS ON AT THE TIME. TURNING THE SEAT HEAT OFF SEEMS TO HAVE SOLVED THE PROBLEM TEMPORARILY. SUSPECT SHORT IN SEAT HEAT WIRING. POTENTIAL FIRE HAZARD! *TR
SEAT CONTROL MODULE FAILURE. 2 MODULES PER CAR, 1 FOR PASSENGER SEAT, AND 1 FOR DRIVER SEAT FAIL. THE DEFECTIVE SEAT CONTROL MODULE UNIT WILL DEPLETE THE CARS BATTERY OVERNIGHT RESULTING IN A NO-START CONDITION THE FOLLOWING DAY. A NEW BATTERY, OR A JUMP START, WILL GET THE CAR GOING AGAIN. THE COMMON IMMEDIATE RESOLUTION IS TO UNPLUG THE SEAT CONTROL MODULE WHICH WOULD IMPACT THE SEATS ABILITY TO RESPOND IN AN ACCIDENT. THE REPLACEMENT PART AND DIAGNOSIS FROM MB DEALER IS APPROX $700/ MODULE. THIS IS A HUGE LIABILITY FOR MERCEDES OWNERS AND THE REPAIR SHOULD BE INVESTIGATED FOR SEAT FUNCTION SAFETY. I UNDERSTAND THE PART NUMBER HAS BEEN UPDATED, WHICH I BELIEVE IS AN ADMISSION BY MERCEDES THAT THE ORIGINAL PART IS DEFECTIVE. *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
WHILE DRIVING EXPERIENCED SUDDEN LOSS OF POWER. ENGINE WOULD REV NORMALLY BUT VEHICLE ACTED AS IF IN NEUTRAL. I WAS ABLE TO MOVE OVER TO SIDE OF FREEWAY SAFELY. PLACED CAR IN PARK AND THEN SHIFTED BACK INTO DRIVE, AND CAR BEHAVED NORMALLY. AFTER DOING RESEARCH, I HAVE DISCOVERED THAT THIS IS A COMMON PROBLEM WITH THIS MODEL. ACCORDING TO, HTTP://JAYAUTO.WORDPRESS.COM, MERCEDES IS IN A FIGHT WITH ITS OWN SUPPLIERS BECAUSE THEY PRODUCE A LOW-QUALITY PART. IF YOU HAVE PROBLEMS WITH YOUR 7-SPEED TRANSMISSIONS, PLEASE REPORT IT TO: NHTSA. ONLY THIS ORGANIZATION CAN ENFORCE MERCEDES TO DO A TRANSMISSION RECALL. IN 2011, MERCEDES MADE THEIR BIGGEST PROFIT IN THEIR HISTORY. HOWEVER, I DON'T THINK THEY WILL USE IT TO FIX THEIR ISSUES WITH TRANSMISSION. *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
SEAT CONTROL MODULE FAILURE. 2 MODULES PER CAR, 1 FOR PASSENGER SEAT, AND 1 FOR DRIVER SEAT FAIL. THE DEFECTIVE SEAT CONTROL MODULE UNIT WILL DEPLETE THE CARS BATTERY OVERNIGHT RESULTING IN A NO-START CONDITION THE FOLLOWING DAY. A NEW BATTERY, OR A JUMP START, WILL GET THE CAR GOING AGAIN. THE COMMON IMMEDIATE RESOLUTION IS TO UNPLUG THE SEAT CONTROL MODULE WHICH WOULD IMPACT THE SEATS ABILITY TO RESPOND IN AN ACCIDENT. THE REPLACEMENT PART AND DIAGNOSIS FROM MB DEALER IS APPROX $700/ MODULE. THIS IS A HUGE LIABILITY FOR MERCEDES OWNERS AND THE REPAIR SHOULD BE INVESTIGATED FOR SEAT FUNCTION SAFETY. I UNDERSTAND THE PART NUMBER HAS BEEN UPDATED, WHICH I BELIEVE IS AN ADMISSION BY MERCEDES THAT THE ORIGINAL PART IS DEFECTIVE. *TR
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
I RECEIVED A NOTICE IN APRIL THAT MY CAR WAS RECALLED BECAUSE OF AIR BAG SAFETY ISSUES. MERCEDES HAS NOT RECTIFIED THE SITUATION. *JB
Too few reports in this category for a page of its own — they appear in the full complaint list.
Other / unspecified
Reports whose component NHTSA recorded as unknown, or that do not map to one of the categories above.
From owner reports, verbatim
SEAT CONTROL MODULE FAILURE. 2 MODULES PER CAR, 1 FOR PASSENGER SEAT, AND 1 FOR DRIVER SEAT FAIL. THE DEFECTIVE SEAT CONTROL MODULE UNIT WILL DEPLETE THE CARS BATTERY OVERNIGHT RESULTING IN A NO-START CONDITION THE FOLLOWING DAY. A NEW BATTERY, OR A JUMP START, WILL GET THE CAR GOING AGAIN. THE COMMON IMMEDIATE RESOLUTION IS TO UNPLUG THE SEAT CONTROL MODULE WHICH WOULD IMPACT THE SEATS ABILITY TO RESPOND IN AN ACCIDENT. THE REPLACEMENT PART AND DIAGNOSIS FROM MB DEALER IS APPROX $700/ MODULE. THIS IS A HUGE LIABILITY FOR MERCEDES OWNERS AND THE REPAIR SHOULD BE INVESTIGATED FOR SEAT FUNCTION SAFETY. I UNDERSTAND THE PART NUMBER HAS BEEN UPDATED, WHICH I BELIEVE IS AN ADMISSION BY MERCEDES THAT THE ORIGINAL PART IS DEFECTIVE. *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
WHILE DRIVING EXPERIENCED SUDDEN LOSS OF POWER. ENGINE WOULD REV NORMALLY BUT VEHICLE ACTED AS IF IN NEUTRAL. I WAS ABLE TO MOVE OVER TO SIDE OF FREEWAY SAFELY. PLACED CAR IN PARK AND THEN SHIFTED BACK INTO DRIVE, AND CAR BEHAVED NORMALLY. AFTER DOING RESEARCH, I HAVE DISCOVERED THAT THIS IS A COMMON PROBLEM WITH THIS MODEL. ACCORDING TO, HTTP://JAYAUTO.WORDPRESS.COM, MERCEDES IS IN A FIGHT WITH ITS OWN SUPPLIERS BECAUSE THEY PRODUCE A LOW-QUALITY PART. IF YOU HAVE PROBLEMS WITH YOUR 7-SPEED TRANSMISSIONS, PLEASE REPORT IT TO: NHTSA. ONLY THIS ORGANIZATION CAN ENFORCE MERCEDES TO DO A TRANSMISSION RECALL. IN 2011, MERCEDES MADE THEIR BIGGEST PROFIT IN THEIR HISTORY. HOWEVER, I DON'T THINK THEY WILL USE IT TO FIX THEIR ISSUES WITH TRANSMISSION. *TR
Too few reports in this category for a page of its own — they appear in the full complaint list.
Transmission
Reports naming the automatic or manual transmission, including shifting behaviour, shudder, slipping and transmission control modules.
From owner reports, verbatim
A O-RING CONNECTED TO THE TRANSMISSION STARTED LEAKING OUT TRANSMISSION FLUID AFTER MY WIFE DROVE THE CAR IN THE SNOW, THE BACK TIRES HAD SOME TRACTION PROBLEM DUE TO THE WET SNOW EARLIER. ONCE THE CAR REACHED HOME, TRANSMISSION OIL WAS DRIPPING ONTO THE GARAGE FLOOR. THE CAR HAS LESS THAN 25K ON IT, IN MINT CONDITION. SHE WAS TOLD BY OUR NEIGHBOR THAT SHE SHOULD NOT DRIVE IT UNTIL THE PROBLEM IS FIXED. THE WAS TAKEN TO THE SHOP AND FIXED IN JANUARY WHEN I RETURNED FROM MY OVERSEE MISSION. THE MERCEDES SHOP INDICATED IT WAS A DEFECT IN THE O-RING DESIGN AND THAT A BETTER REPLACEMENT O-RING WAS INSTALLED FOR A HEFTY PRICE SINCE THE WARRANTY ON THE CAR ENDED THE PRIOR MONTH. I DID SOME RESEARCH ON THE WEB TO SEE IF THIS PROBLEM WAS COMMON GIVEN IT WAS A DESIGN DEFECT IN THE O-RING. TO MY SURPRISE I FOUND THIS WAS A COMMON PROBLEM THAT MERCEDES BENZ REFUSES TO ACKNOWLEDGE. HAD SHE BEEN DRIVING THE CAR SHE COULD HAVE ENDED UP DAMAGING THE TRANSMISSION AND WORSE GOTTEN STRANDED SOMEWHERE. I THINK THIS DEFECT NEEDS TO BE INVESTIGATED FURTHER TO ENSURE SAFETY OF THE DRIVERS OF THE VEHICLE GIVEN THIS WAS NOT AN ISOLATED INCIDENT. OTHERS ON THE WEB HAVE REPORTED SIMILAR PROBLEMS. *TR
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 .