2003 Mercedes-Benz C-Class Electrical System
Owner-reported problems and safety issues filed with NHTSA. Review common failures, severity levels, and complaint trends over time.
Complaint Timeline
Chronological view of owner reports
The secondary instrument fuse block located on the driver's side of the dashboard erupted in flame while the vehicle was being driven, endangering its occupant, causing significant damage to its interior, and resulting in a local law enforcement "traffic hazard" determination.
There is an open recall on my brand of Mercedes-Benz but my Vin number isn’t included it’s on the sunroof where it stays open or it could possibly fly off it gets off track or whatever happens well mine will not go down I have to manually open it or manually close it it is a safety issue because it will refuse to go down completely and will be shaking while I am driving it puts me and others at risk but the dealership is refusing to fix it under A recall even though my brand and type is included in the recall
JUST LIKE OTHER REPORTS HERE - ELECTRICAL MALFUNCTION. 50K MILES. TOOK TO MB DEALER FOR ROUGH IDLE AT COLD START UP AND LOW SPEEDS; LOUDER THAN NORMAL IDLE AT START AND IN REVERSE. NO CHECK ENGINE LIGHT, NO ERROR OR PROBLEM INDICATED IN DASH AT ALL. SAME DIAGNOSIS - DEALER REPORTED CAM SOLENOIDS LEAKING ENGINE OIL INTO THE WIRING HARNESS SHORTING HARNESS COMPONENTS (O2 SENSORS ETC.), HIGH $$$ $3600-$4000 REPAIR. ISSUE SHOULD BE RESOLVED AND PAID FOR BY MB SINCE THIS IS KNOWN DEFECT THAT SEVERELY REDUCES THE DRIVE-ABILITY AND VALUE OF THE VEHICLE. *TR
CHECK ENGINE LIGHT ON, WITH OCCASIONAL POOR GAS MILEAGE, ROUGH RUNNING. WHEN ENGINE STARTS ROUGH, ENGINE STOP/RE-START GETS ENGINE TO IDLE/RUN PROPERLY. DEALER REPORTED CAM SOLENOIDS LEAKING ENGINE OIL INTO THE WIRING HARNESS SHORTING HARNESS COMPONENTS (O2 SENSORS ETC.), HIGH $$$ REPAIR. FIRST OCCURRENCE AT 57K MILES (JUST OUT OF WARRANTY). CONTACTED MB, NO CONCERN, TOO BAD FOR YOU. SPORADIC RED LED WARNING ABOUT GAS CAP, BLINKING INDICATOR IN FUEL GAUGE, STOP/RESTART ENGINE, GOES AWAY (ERROR NOT IN OWNERS MANUAL). CAR STILL RUNNING AT 78K MILES AND USUALLY 35 MPG DURING NORMAL COMMUTE SO FAR (WITHOUT REPAIR SO FAR, DO NOT HAVE TAIL PIPE EMISSION CHECK IN AREA YET, SO NOT MANDATED TO FIX MIL LIGHT ISSUE), CLEAR ECM CODES OCCASIONALLY, COME BACK AFTER 3 KEY CYCLES. STUCK WITH CAR THAT IS NOT WORTH FIXING TO HAVE SAME PROBLEM COME BACK. THIS CAM SOLENOID/WIRING HARNESS/O2 SENSOR/CHECK ENGINE LIGHT ISSUE SHOULD BE RESOLVED AND PAID FOR BY MB SINCE THIS IS KNOWN DEFECT THAT SEVERELY REDUCES THE DRIVABLILTY AND VALUE OF THE VEHICLE. *TR
CHECK ENGINE LIGHT LEAD TO ROUGH IDLING AND INABILITY TO DRIVE VEHICLE. 2003 MERCEDES BENZ C230 WITH 61,650 MILES ON IT. ALL CAM SENSORS, O2 SENSORS, MAF SENSOR, ENGINE WIRING HARNESS REPLACED WITH NECESSARY O-RINGS AT DEALER. CAR WAS LAID UP 5 DAYS AND AT A COST OF $2,500. *TR
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 13,703 MILES ON IT AND THIS PROBLEM IS BEEN KNOWN TO MB USA YET IS NOT ADDRESSED. *TR
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
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
Trend Over Time
Complaints by year
Other Issues
Common problems reported
Quick Summary
The 2003 Mercedes-Benz C-Class has 8 Electrical System complaints on file. Review the timeline above for detailed owner experiences.