Total Complaints
11 filings
MERCEDES-BENZ SLK · model year
11 NHTSA complaints for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2003MERCEDES-BENZSLK carries 11 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 0 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2003 SLK is electrical system with 2 filings, followed by steering:hydraulic power assist:power steering fluid (1) and exterior lighting:brake lights (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 15 investigation files overlapping the 2003 SLK. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
Total Complaints
11 filings
Crashes Reported
0 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| ELECTRICAL SYSTEM | 2 |
| STEERING:HYDRAULIC POWER ASSIST:POWER STEERING FLUID | 1 |
| EXTERIOR LIGHTING:BRAKE LIGHTS | 1 |
| ELECTRICAL SYSTEM:IGNITION:SWITCH | 1 |
| VISIBILITY | 1 |
| EQUIPMENT | 1 |
| VISIBILITY:REARVIEW MIRRORS/DEVICES | 1 |
| EXTERIOR LIGHTING | 1 |
| SERVICE BRAKES, HYDRAULIC | 1 |
| ELECTRONIC STABILITY CONTROL (ESC) | 1 |
I OWN A 2003 MERCEDES SLK 230 , WHICH BRAKES ON IT'S OWN AT ALL DIFFERENT SPEEDS . AFTER THE CAR BRAKES TO THE RIGHT FOR A COUPLE OF SECOND THE BAS/ESP LIGHT COMES ON . I HAVE HAD THIS HAPPEN ON THE HIGHWAY AT 60 MPH (VERY SCARY). I HAVE SINCE HAD THE BRAKE SWITCH CHANGED , AND WHEEL SENSORS AND NEW BATTERY. I HAVE SINCE PICKED MY CAR UP AND NO PROBLEM FOR THE LAST 100 MILES UNTIL TODAY WHEN THE SAME THING OCCURRED AT A LOWER SPEED . CAR IS BACK IN THE SHOP READING NO CODES !!!!!! I HAVE GONE TO THE MERCEDES FORUM AND I FIND THAT THIS PROBLEM IS NOT UNCOMMON . IT SEEMS THAT THE YAW SENSOR AND OR LATERAL CONTROL SENSOR GOES AND CAUSE THE CAR TO THINK IT IS SLIDING AND RANDOMLY BRAKES (ALWAYS TO THE RIGHT) . ALL OF THE COMPLAINTS HAVE HAD THEIR OWNERS IN A PANIC . THIS SEEMS TO BE EXTREMELY DANGEROUS . *TR
Mileage: 116,223
I OWN A 2003 MERCEDES SLK 230 , WHICH BRAKES ON IT'S OWN AT ALL DIFFERENT SPEEDS . AFTER THE CAR BRAKES TO THE RIGHT FOR A COUPLE OF SECOND THE BAS/ESP LIGHT COMES ON . I HAVE HAD THIS HAPPEN ON THE HIGHWAY AT 60 MPH (VERY SCARY). I HAVE SINCE HAD THE BRAKE SWITCH CHANGED , AND WHEEL SENSORS AND NEW BATTERY. I HAVE SINCE PICKED MY CAR UP AND NO PROBLEM FOR THE LAST 100 MILES UNTIL TODAY WHEN THE SAME THING OCCURRED AT A LOWER SPEED . CAR IS BACK IN THE SHOP READING NO CODES !!!!!! I HAVE GONE TO THE MERCEDES FORUM AND I FIND THAT THIS PROBLEM IS NOT UNCOMMON . IT SEEMS THAT THE YAW SENSOR AND OR LATERAL CONTROL SENSOR GOES AND CAUSE THE CAR TO THINK IT IS SLIDING AND RANDOMLY BRAKES (ALWAYS TO THE RIGHT) . ALL OF THE COMPLAINTS HAVE HAD THEIR OWNERS IN A PANIC . THIS SEEMS TO BE EXTREMELY DANGEROUS . *TR
Mileage: 116,223
2003 SLK 230 TAIL LIGHT STILL DEFECTIVE AFTER RECALL REPAIR WAS PERFORMED. *TR
Mileage: 80,000
TL* THE CONTACT OWNS A 2003 MERCEDES SLK320 ( N/A). WHILE DRIVING AT VARIOUS SPEEDS , THE VEHICLE LOSES POWER WITHOUT ANY WARNING AND AFTER THE VEHICLE LOSES POWER ALL THE LIGHTS ILLUMINATES ON THE INSTRUMENT PANEL. THE VEHICLE WAS TOWED TO HIS RESIDENCE.THIS HAS OCCURRED 10 ADDITIONAL TIMES. THE DEALER WAS CONTACTED AND THEY CONCLUDED THAT IT WAS THE K40 CIRCUIT FUSE THAT FAILED. THE FUSE WAS REPLACED AT THE OWNERS EXPENSE. THE FAILURE MILEAGE WAS 74000 AND CURRENT MILEAGE WAS 76000.
Mileage: 74,000
THE INSIDE REAR VIEW MIRROR IN MY 2003 MERCEDES-BENZ SLK 230 (R170 MODEL) IS AN ELECTRO CHROMIC SELF-DIMMING MIRROR THAT HAS NO MANUAL BACKUP. THE MIRROR CONTAINED A FLUID WHICH LEAKED OUT CAUSING THE SELF-DIMMING MIRROR TO FAIL TO PROVIDE DIMMING AGAINST REAR APPROACHING HEADLIGHTS RESULTING IN THE DRIVER TO EITHER BE BLINDED OR TO HAVE TO TURN THE MIRROR AWAY WHICH GREATLY ELIMINATES REAR VIEW CAPABILITY IN THE INTERIOR. THERE ARE NUMEROUS DOCUMENTED CASES OF THESE MIRRORS FAILING IN VARIOUS MAKES AND MODELS AS A RESULT OF USUALLY FROM THE INTERNAL FLUID LEAKING. I CONTACTED THE OEM MIRROR MAKER, AND THEY REFUSED TO RETURN OUR PHONE CALL/MESSAGES. I RECENTLY READ ON THE MAINTENANCE BLOGS THAT MAGNA DONNELLY WERE REPLACING BUT, STOPPED ALL OF SUDDEN. I HAVE NEVER HAD A VEHICLE THAT HAS EVER EXPERIENCED SUCH A PROBLEM WITH THE REAR VIEW MIRROR. *TR
THE INSIDE REAR VIEW MIRROR IN MY 2003 MERCEDES-BENZ SLK 230 (R170 MODEL) IS AN ELECTRO CHROMIC SELF-DIMMING MIRROR THAT HAS NO MANUAL BACKUP. THE MIRROR CONTAINED A FLUID WHICH LEAKED OUT CAUSING THE SELF-DIMMING MIRROR TO FAIL TO PROVIDE DIMMING AGAINST REAR APPROACHING HEADLIGHTS RESULTING IN THE DRIVER TO EITHER BE BLINDED OR TO HAVE TO TURN THE MIRROR AWAY WHICH GREATLY ELIMINATES REAR VIEW CAPABILITY IN THE INTERIOR. THERE ARE NUMEROUS DOCUMENTED CASES OF THESE MIRRORS FAILING IN VARIOUS MAKES AND MODELS AS A RESULT OF USUALLY FROM THE INTERNAL FLUID LEAKING. I CONTACTED THE OEM MIRROR MAKER, AND THEY REFUSED TO RETURN OUR PHONE CALL/MESSAGES. I RECENTLY READ ON THE MAINTENANCE BLOGS THAT MAGNA DONNELLY WERE REPLACING BUT, STOPPED ALL OF SUDDEN. I HAVE NEVER HAD A VEHICLE THAT HAS EVER EXPERIENCED SUCH A PROBLEM WITH THE REAR VIEW MIRROR. *TR
THE INTERIOR REARVIEW MIRROR IN A 2003 MERCEDES BENZ SLK230 (R170) HAD A FLUID LEAK. THE MIRROR IS SUPPOSED TO BE A CHROMATIC AUTO-DIMMING DEVICE. DUE TO THE FLUID LEAK ALL OF THE DARKENING AGENT HAS MIGRATED TO THE CENTER OF THE MIRROR. THE MIRROR NO LONGER AUTO DIMS, IT CREATES MULTIPLE OBJECTS DUE TO GLARE AND INTERNAL REFLECTION. IT IS COMPLETELY UNUSABLE IN IT'S CURRENT CONDITION. THE MANUFACTURER OF THIS MIRROR MAGNA DONNELLEY USED TO OFFER FREE REPLACEMENT OF THESE DEVICES, WHICH HAVE A LONG TRACK RECORD OF FAILING, BUT NOW NO LONGER DO. THE REPLACEMENT COST OF THE DEVICE IS APPROX. $200 WITH A $100 INSTALL CHARGE BY THE DEALER. *TR
Mileage: 90,000
MERCEDES WITH 23,000 IGNITION SWITCH WILL NOT TURN. I REPORTED THE ISSUE OF INTERMITTENT PROBLEM TO DEALER AND ATTEMPTED TO HAVE IT RESOLVED WHILE UNDER EXTENDED WARRANTY PERIOD. THE DEALER SAID IT HAD NOT FAILED. WELL, THE WARRANTY IS GONE AND THE FAILING PART FAILED. IT IS EXPENSIVE AND APPEARS TO BE A KNOWN ISSUE BASED ON MY DISCUSSION WITH OTHER OWNERS AND COMPLAINTS HERE. *TR
Mileage: 23,000
I INSERTED THE KEY IN THE IGNITION SWITCH AND WAS UNABLE TO TURN THE KEY OR REMOVE THE KEY AND THE CAR WOULD NOT START. I WAS LEFT STRANDED IN A BAD SECTION OF TOWN AND HAD TO WAIT FOR FLAT BED TO TAKE THE CAR TO THE DEALERSHIP. I HAD TO RENT A CAR FOR THREE DAYS WHILE THE DEALERSHIP REPLACED THE ENTIRE IGNITION SWITCH. *TR
Mileage: 70,000
NHTSA CAMPAIGN NUMBER IS 05V505000. MERCEDES BENZ USA HAS NOT PROVIDED INFORMATION TO CORRECT THE FAILURE AFTER INFORMING ME OF A POTENTIAL SAFETY HAZARD WITH THE TAIL LAMP ASSEMBLY IN SLK MOTOR VEHICLES. SUBSEQUENTLY BOTH MY TAIL LIGHTS ARE NOT FUNCTIONING AND CAUSING SAFETY HAZARD. DEALERSHIPS CONTACTED HAVE NO INFORMATION FROM MBUSA ON HOW TO CORRECT THE DEFECTIVE PARTS AFFECTED IN THE RECALL. *JB
AT APPROX. 52,000 MILES ON MY CAR, I TOOK IT TO GET SERVICED BY A NON MERCEDES DEALER SHIP, SINCE THE WARRANTY WAS OUT. THEY FOUND THE POWER STEERING LEAKING AND THE RESERVOIR WAS EMPTY. I HAD JUST TAKEN THE CAR IN FOR A SERVICE THREE WEEKS EARLIER FOR WARRANTY WORK, AND THIS PROBLEM WAS NOT FOUND. FLUID WAS LEAKING AROUND THE POWER STEERING PUMP. *JB
Mileage: 52,000
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.