2003 Mercedes-Benz SL-Class problems

Verdict · NHTSA data

Limited data — recalls on file

NHTSA has just 23 complaints on file for the 2003 Mercedes-Benz SL-Class — too few to judge reliability from owner reports alone — but 3 recall campaigns apply to this year, so any used example should have its VIN checked for completed recall work.

NHTSA complaints

Recalls

Investigations

Crash-involved

Fires reported

Injuries

Deaths

—

NCAP overall

How does 2003 compare to other SL-Class years?

SL-Class NHTSA complaints by model year, 2003 highlighted. Red bars are years to avoid.

See all SL-Class years to avoid →

What are the most common 2003 Mercedes-Benz SL-Class problems?

Component	Complaints	Share	vs prior year
Brakes	3	13%	— flat
Visibility & Wipers	3	13%	▲ up
Body & Structure	3	13%	▲ up
Lighting	2	9%	▲ up
Electrical System	2	9%	▼ down
Engine	2	9%	▲ up
Suspension	2	9%	— flat
Speed Control	1	4%	new
Fuel System	1	4%	▼ down
Driver Assistance	1	4%	new
Tires & Wheels	1	4%	— flat
Transmission	1	4%	— flat
Airbags	1	4%	▼ down

Does the 2003 Mercedes-Benz SL-Class have recalls?

3 NHTSA recall campaigns on file. Recall repairs are free at franchised dealers.

08V303000Electrical SystemJuly 7, 2008 · 404 units

Defect

MERCEDES-BENZ IS RECALLING MY 2006-2008 M-CLASS, R-CLASS, MY 2005-2009 SLK-CLASS, MY 2005-2008 C-CLASS, MY 2003-2004 AND 2006-2008 CLK-CLASS, MY 2003-2008 E-CLASS, MY 2004 AND 2008 CL-CLASS, MY 2008 CLS-CLASS, MY 2004 AND 2007-2008 S-CLASS, MY 2003 G-CLASS, AND MY 2003-2004, 2006 AND 2009 SL-CLASS VEHICLES. A SOFTWARE CALIBRATION NUMBER (SCN) CODING RECEIVED ON THE AFFECTED VEHICLES DURING A RECENT WORKSHOP VISIT WAS INCORRECT. DEPENDING ON THE MODEL YEAR AND MODEL AFFECTED, THE RESULTS OF AN INCORRECT SCN CODING CAN AFFECT A NUMBER OF VEHICLE SAFETY AND EMISSION FUNCTIONS INCLUDING THE FOLLOWING TYPES OF FUNCTIONS: (1) THE FUEL GAUGE READINGS MAY BE INCORRECT; (2) A STUCK FUEL-LEVEL SENSOR MAY NOT BE DISPLAYED IN THE INSTRUMENT CLUSTER; (3) THE OBD SYSTEM MAY CAUSE THE CHECK ENGINE LIGHT TO ILLUMINATE INCORRECTLY; AND, (4) THE SPEEDOMETER MAY BE OUT OF TOLERANCE.

Consequence

IN THE EVENT OF A VEHICLE CRASH, THE ELECTRICAL FUEL PUMP MAY NOT RECEIVE A CRASH SIGNAL THAT IS REQUIRED FOR THE FUEL PUMP TO DISCONNECT AND PREVENT FUTURE FUEL DELIVERY AS DESIGNED.

Remedy

DEALERS WILL RECODE THE SCN FREE OF CHARGE. THE RECALL BEGAN ON AUGUST 30, 2008. OWNERS MAY CONTACT MERCEDES-BENZ AT 1-800-367-6372.

05V133000BrakesApril 1, 2005 · 204,000 units

Defect

ON CERTAIN VEHICLES, THE SENSOTRONIC BRAKE CONTROL (SBC) SYSTEM MAY PREMATURELY SHIFT TO THE HYDRAULIC BACK-UP FUNCTION MODE, DUE TO DETERIORATION OF THE WIRING HARNESS CONNECTION, OR DUE TO PREMATURE FAILURE OF THE HYDRAULIC PUMP.

Consequence

IN THE HYDRAULIC BACK-UP MODE, THE DRIVER HAS BRAKING POWER SUFFICIENT TO STOP THE VEHICLE, ALTHOUGH GREATER BRAKE PEDAL PRESSURE IS REQUIRED AND THE BRAKE PEDAL TRAVEL WILL BE NOTICEABLY LONGER.

Remedy

DEALERS WILL INSTALL A BRACKET AND REPLACEMENT GROUND WIRE TO THE SBC PUMP UNIT ON ALL VEHICLES FREE OF CHARGE. ADDITIONALLY DEALERS WILL INSPECT AND REPLACE THE SBC PUMP UNIT IN SL VEHICLES PRODUCED DURING A LIMITED PRODUCTION PERIOD. THE RECALL BEGAN ON AUGUST 8, 2005. OWNERS MAY CONTACT MERCEDES-BENZ AT 1-800-367-6372.

04V296000BrakesJune 22, 2004 · 143,387 units

Defect

ON CERTAIN VEHICLES, THE ELECTRONIC MONITORING SYSTEM OF THE SENSOTRONIC BRAKE CONTROL (SBC) IS DESIGNED TO MONITOR THE PRESSURE GRADIENT WITHIN THE HIGH PRESSURE LINE OF THE BRAKE SYSTEM. IF AN UNACCEPTABLE PRESSURE GRADIENT IS DETECTED, THE SYSTEM WILL SWITCH, AS IT IS DESIGNED TO DO, INTO THE HYDRAULIC FUNCTION MODE.

Consequence

IF VEHICLES ARE NOT ROUTINELY SERVICED AND HAVE EXTREMELY HIGH MILEAGE COMBINED WITH A HIGH NUMBER OF BRAKE ACTUATIONS, OR A HIGH BRAKE ACTUATION FREQUENCY, THE PUMP MOTOR OF THE SBC MAY RUN OUT OF PERMISSIBLE TOLERANCES, THEREBY TRIGGERING THE HYDRAULIC FUNCTION MODE.

Remedy

DEALERS WILL INSPECT THE SBC HYDRAULIC UNIT, REPLACING IT IF NECESSARY. THE RECALL BEGAN ON OCTOBER 21M 2004. OWNERS SHOULD CONTACT MERCEDES-BENZ AT 1-800-367-6372.

Consumer complaints filed with NHTSA

Representative excerpts, cleaned of personal information. These are consumer statements, not verified defects.

“THE HEATER MOTOR HAD BLOWN OUT. THE VEHICLE BOX CAUGHT ON FIRE. *AK THE FIRE MELTED THE MELTED THE WIRING HARNESS. *SCC *JB ”
Complaint filed with NHTSA · Visibility & Wipers · June 25, 2003 · fire

“IN THE RIGHT DOOR PANEL THERE IS A GLUE THAT SEALS THE PANELS TOGETHER. THIS GLUE GIVES OFF TOXIC FUMES. CONSUMER'S WIFE IS CURRENTLY SEEING A NEUROLOGIST FOR PROBLEMS SUFFERED FROM INHALING THE FUMES. THE MANUFACTURER AND THE DEALER HAVE BEEN NOTIFIED.*AK”
Complaint filed with NHTSA · Body & Structure · September 18, 2002

“THE VEHICLE (2003 MB SLK320) WAS PURCHASED ON 4/14/2004 IN AZ AND BEGAN NOTICING PROBLEMS ON THE DRIVE BACK TO NM. THE MOST SIGNIFICANT SAFETY PROBLEM INVOLVES THE TRANSMISSION, WHICH HAS BEEN SERVICED BY THE MANUFACTURER 8 TIMES WITHOUT RESOLUTION. THE VEHICLE SLIPS IN AND OUT OF GEAR AT HIGHWAY…”
Complaint filed with NHTSA · Brakes · June 25, 2003

“2003 MERCEDES BENZ SLK 320 EXPERIENCING PROBLEMS WITH HESITATION WHEN THE ACCELERATOR IS DEPRESSED.*MR ON ONE OCCASIONS WHEN THE CONSUMER ATTEMPTED TO APPLY THE GAS THE VEHICLE DID NOT MOVE FOR A FEW SECONDS AND THEN ALL OF A SUDDEN THE VEHICLE LURCHED FORWARD AND THE CONSUMER HIT ANOTHER VEHICLE.…”
Complaint filed with NHTSA · Engine · March 1, 2005 · crash

“THE VEHICLE (2003 MB SLK320) WAS PURCHASED ON 4/14/2004 IN AZ AND BEGAN NOTICING PROBLEMS ON THE DRIVE BACK TO NM. THE MOST SIGNIFICANT SAFETY PROBLEM INVOLVES THE TRANSMISSION, WHICH HAS BEEN SERVICED BY THE MANUFACTURER 8 TIMES WITHOUT RESOLUTION. THE VEHICLE SLIPS IN AND OUT OF GEAR AT HIGHWAY…”
Complaint filed with NHTSA · Suspension · June 25, 2003

2003 Mercedes-Benz SL-Class — common questions

Is the 2003 Mercedes-Benz SL-Class reliable?

The record is thin — 23 NHTSA complaints — so owner-report data can't strongly confirm reliability either way, though 3 recalls should be verified as completed.

What are the most common 2003 SL-Class problems?

According to NHTSA complaint data, the leading problem areas are brakes (3 complaints), body & structure (3 complaints), visibility & wipers (3 complaints).

Does the 2003 Mercedes-Benz SL-Class have recalls?

Yes — NHTSA lists 3 recall campaigns affecting the 2003 Mercedes-Benz SL-Class. Recall repairs are free at franchised dealers; check the VIN at nhtsa.gov/recalls to confirm the work was done.

Is the 2003 Mercedes-Benz SL-Class under NHTSA investigation?

NHTSA opened one investigation into this model year; all are now closed.

Based on NHTSA ODI data through June 2026. Complaints are consumer-reported and unverified. Updated July 5, 2026.

Compiled by Sharon Ben-Moshe, Founder.

How does 2003 compare to other SL-Class years?

What are the most common 2003 Mercedes-Benz SL-Class problems?

Does the 2003 Mercedes-Benz SL-Class have recalls?

Consumer complaints filed with NHTSA

2003 Mercedes-Benz SL-Class — common questions

Is the 2003 Mercedes-Benz SL-Class reliable?

What are the most common 2003 SL-Class problems?

Does the 2003 Mercedes-Benz SL-Class have recalls?

Is the 2003 Mercedes-Benz SL-Class under NHTSA investigation?

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