Is fuel tank baffle loose and banging inside tank a known issue with the 2003 Mercedes-Benz SL-Class?

23 NHTSA complaints have been filed about fuel tank baffle loose and banging inside tank on the 2003 Mercedes-Benz SL-Class (2008-04 → 2022-03). Reported component: FUEL SYSTEM, GASOLINE. From an owner report (NHTSA ODI #10630982): "BAFFLE IN FUEL TANK STARTED HITTING THE SIDE OF THE TANK MAKE A NOISE WHEN FUEL TANK IS 3/4 FULL OR LESS. APPARENTLY THE BAFFLE BREAKS AT ONE END ALLOWING THE BAFFLE TO BANG AGAINST THE WALL OF THE FUEL CELL" Source: NHTSA.

Is brake pedal to floor and sbc hydraulic unit failure a known issue with the 2003 Mercedes-Benz SL-Class?

17 NHTSA complaints have been filed about brake pedal to floor and sbc hydraulic unit failure on the 2003 Mercedes-Benz SL-Class (2004-08 → 2022-07). Reported component: SERVICE BRAKES, HYDRAULIC. From an owner report (NHTSA ODI #10353754): "THE CONTACT WAS DRIVING APPROXIMATELY 20 MPH WHEN THE BRAKE WAS DEPRESSED, IT ABNORMALLY WENT TO THE FLOOR WITHOUT RESISTANCE TO THE BRAKE PEDAL PRESSURE" Source: NHTSA.

Is gearshift assembly failure and stuck in park a known issue with the 2003 Mercedes-Benz SL-Class?

3 NHTSA complaints have been filed about gearshift assembly failure and stuck in park on the 2003 Mercedes-Benz SL-Class (2011-04 → 2015-08). Reported component: POWER TRAIN. From an owner report (NHTSA ODI #10759416): "PLASTIC PIECE ON GEARSHIFT ASSEMBLY BROKE NOT ALLOWING CAR TO BE PLACED IN GEAR" Source: NHTSA.

Is instrument panel, ignition and no-start failures a known issue with the 2003 Mercedes-Benz SL-Class?

5 NHTSA complaints have been filed about instrument panel, ignition and no-start failures on the 2003 Mercedes-Benz SL-Class (2005-04 → 2019-07). Reported component: ELECTRICAL SYSTEM. From an owner report (NHTSA ODI #11230269): "SOMETIMES WHEN I START THE CAR THE LIGHTS ON THE DASH WILL NOT COME ON AND NONE OF THE GAUGES WORK ! THEN I TURN IT OFF AND BACK ON AGAIN AND IT WORKS!" Source: NHTSA.

Is active body control suspension failure and fluid leaks a known issue with the 2003 Mercedes-Benz SL-Class?

40 NHTSA complaints have been filed about active body control suspension failure and fluid leaks on the 2003 Mercedes-Benz SL-Class (2005-11 → 2023-08). Reported component: SUSPENSION. From an owner report (NHTSA ODI #11474844): "I was driving my car at 45 mph and suddenly, unexpectedly a red light flashed ABC do not drive. Smoke was coming from under the car and the front end of the vehicle collapsed downwardly" Source: NHTSA.

Is battery control module fire in trunk a known issue with the 2003 Mercedes-Benz SL-Class?

5 NHTSA complaints have been filed about battery control module fire in trunk on the 2003 Mercedes-Benz SL-Class (2023-04 → 2023-11). Reported component: ELECTRICAL SYSTEM. From an owner report (NHTSA ODI #11519614): "It appears the BCM (Battery Control Module) caught fire and burned a significant portion of the trunk and associated wiring" Source: NHTSA.

2003 Mercedes-Benz SL-Class Recalls, Problems & Maintenance

The 2003 Mercedes-Benz SL-Class has no open NHTSA recalls. Owners report 6 recurring issue clusters, led by “Fuel tank baffle loose and banging inside tank.” Mercedes-Benz alternates two service events: Service A (oil, filter, inspection) at roughly 10,000 miles or 1 year, then Service B (Service A plus brake fluid, cabin filter, and deeper checks) at roughly 20,000 miles or 2 years — the ASSYST Plus counter in the cluster tells you which is due. Oil must carry the MB-Approval number your engine specifies (commonly 229.5, or 229.71 for newer 0W-20 engines); 'meets or exceeds' marketing language is not an approval. Electric EQB and EQS models keep the A/B rhythm for inspections, brake fluid, and cabin filters — just without oil.

Save this car as:

No open recalls on file. NHTSA lists no unrepaired safety recalls for this year, make and model. A recall can be issued at any time, and a specific car can still have one open — check yours by VIN at nhtsa.gov/recalls.

Known issues & problems for this vehicle

What drivers and federal regulators have officially reported about the 2003 Mercedes-Benz SL-Class.

Reported to NHTSA

Fuel tank baffle loose and banging inside tank

FUEL SYSTEM, GASOLINE

23 NHTSA complaints · 2008-04 → 2022-03

“BAFFLE IN FUEL TANK STARTED HITTING THE SIDE OF THE TANK MAKE A NOISE WHEN FUEL TANK IS 3/4 FULL OR LESS. APPARENTLY THE BAFFLE BREAKS AT ONE END ALLOWING THE BAFFLE TO BANG AGAINST THE WALL OF THE FUEL CELL”
— Owner report, NHTSA ODI #10630982

“THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC WHERE IT WAS DIAGNOSED THAT THE BAFFLE IN THE FUEL TAKE FRACTURED AND NEEDED TO BE REPLACED”
— Owner report, NHTSA ODI #10785613

“THE BAFFLE INSIDE THE GAS TANK HAS COME LOOSE AND IS HITTING THE INSIDE OF THE TANK. THE ONLY TIME IT ISN'T NOISY IS WHEN THE TANK IS FULL”
— Owner report, NHTSA ODI #10549378

Read all complaints on NHTSA →

Brake pedal to floor and SBC hydraulic unit failure

SERVICE BRAKES, HYDRAULIC

17 NHTSA complaints · 2004-08 → 2022-07

“THE CONTACT WAS DRIVING APPROXIMATELY 20 MPH WHEN THE BRAKE WAS DEPRESSED, IT ABNORMALLY WENT TO THE FLOOR WITHOUT RESISTANCE TO THE BRAKE PEDAL PRESSURE”
— Owner report, NHTSA ODI #10353754

“WHILE DRIVING AT APPROX. 20-35MPH I PRESSED THE BRAKE AND ALMOST WENT TO THE FLOOR WITH NO RESISTANCE”
— Owner report, NHTSA ODI #10586487

“I HAVE A 2003 MERCEDES SL500 WITH 52000 MILES ON IT AND SUDDENLY THE BRAKE WARNING LIGHT CAME UP AND THE INVESTIGATION LINKED IT TO THE SBC HYDRAULIC RECALL (2005070007)”
— Owner report, NHTSA ODI #10780144

Read all complaints on NHTSA →

Gearshift assembly failure and stuck in park

POWER TRAIN

3 NHTSA complaints · 2011-04 → 2015-08

“PLASTIC PIECE ON GEARSHIFT ASSEMBLY BROKE NOT ALLOWING CAR TO BE PLACED IN GEAR”
— Owner report, NHTSA ODI #10759416

“OUR 2003 MERCEDES-BENZ SL500 BECAME STUCK IN PARK AND COULD NOT GET OUT OF PARK DESPITE A VARIETY OF RECOMMENDED ATTEMPTS (TURNING KEY TO ON BUT NOT STARTING AND PUMPING BRAKES, ETC.)”
— Owner report, NHTSA ODI #10394283

“GEAR SHIFT MECHANISM STUCK IN PARK”
— Owner report, NHTSA ODI #10418431

Read all complaints on NHTSA →

Instrument panel, ignition and no-start failures

ELECTRICAL SYSTEM

5 NHTSA complaints · 2005-04 → 2019-07

“SOMETIMES WHEN I START THE CAR THE LIGHTS ON THE DASH WILL NOT COME ON AND NONE OF THE GAUGES WORK ! THEN I TURN IT OFF AND BACK ON AGAIN AND IT WORKS!”
— Owner report, NHTSA ODI #11230269

“THE CONTACT STATED THAT WHILE TURNING ON THE VEHICLE, THE INSTRUMENT PANEL AND OTHER UNKNOWN ELECTRICAL FUNCTIONS FAILED TO OPERATE”
— Owner report, NHTSA ODI #10782372

“IGNITION FAILURE, NO KEYS WORK TO START THE VEHICLE (IT DOESN'T RECOGNIZE THE KEYS) CAR HAD TO BE PUT ON A FLATBED TRUCK AND SENT TO DEALER FOR REPAID”
— Owner report, NHTSA ODI #10240547

Read all complaints on NHTSA →

Active Body Control suspension failure and fluid leaks

SUSPENSION

40 NHTSA complaints · 2005-11 → 2023-08

“I was driving my car at 45 mph and suddenly, unexpectedly a red light flashed ABC do not drive. Smoke was coming from under the car and the front end of the vehicle collapsed downwardly”
— Owner report, NHTSA ODI #11474844

“THIS CAR HAS HAD ABC PROBLEMS FROM DAY ONE. FIRST WE HAD HYDRAULIC LEAKS, WE REPLACED STRUTS, THEN THE PUMP WENT OUT AND HAD TO REPLACE THAT”
— Owner report, NHTSA ODI #10788348

“THE CONTACT STATED THAT WHILE WAITING AT A STOP SIGN, THE VEHICLE LOWERED ITSELF ABOUT 6 INCHES. THE VEHICLE WAS TAKEN TO THE DEALER FOR INSPECTION AND THEY STATED THAT THE HYDRAULIC VALVE NEEDED TO BE REPLACED”
— Owner report, NHTSA ODI #10481961

Read all complaints on NHTSA →

Battery control module fire in trunk

ELECTRICAL SYSTEM

5 NHTSA complaints · 2023-04 → 2023-11

“It appears the BCM (Battery Control Module) caught fire and burned a significant portion of the trunk and associated wiring”
— Owner report, NHTSA ODI #11519614

“The battery control module (known as the BCM or BNS) failed, triggering a fire. The incident occurred while the vehicle was parked in a garage and had not been operated for several weeks”
— Owner report, NHTSA ODI #11557042

“To who may this concerned, I have a 2003 Mercedes SL500 and recently found my battery control module caught on fire and burnt a section of my car”
— Owner report, NHTSA ODI #11557470

Combination / Dust Filter

Every 20,000 mi

Replaced with every Service B. Models with the ENERGIZING air package use a higher-grade filter — priced accordingly.

Estimated cost — typical U.S. ranges

Dealer

~$60–$95

Shop

~$45–$70

DIY

~$15–$40

Usually behind the glovebox. Shops charge labor for a 10-minute job — easy DIY win.

Engine Coolant

On condition / lifetime

MB-spec coolant is long-life (typically ~10 years / 150,000 miles on the sheet). Refresh only with MB 325/326-spec coolant — the wrong chemistry attacks aluminum and head gaskets.

Estimated cost — typical U.S. ranges

Dealer

~$285–$330

Shop

~$200–$235

DIY

~$25–$60

Use the manufacturer-specified coolant — wrong color/chemistry can damage the cooling system.

12V & Auxiliary Battery

Every 25,000 mi

Test annually after year 3. Most modern Mercedes carry a second auxiliary battery; a weak one triggers cascading warning messages long before a no-start. EQ models also depend on the 12V system to boot.

Estimated cost — typical U.S. ranges

Dealer

~$225–$390

Shop

~$160–$280

DIY

~$130–$250

Most auto-parts stores test and install batteries free with purchase. Skip the dealer markup.

Fatal crash history & reported problems

Occupant deaths in fatal crashes (FARS)

17 crashes 1990–2024

How the 17 occupant deaths break down

driver deaths

passenger deaths

occupant deaths

Crash years covered: 1990–2024 This model year first appears in 2004 crashes. Older models have had more years on the road to appear in these crashes, so a higher count here does not by itself mean a vehicle is less safe.

FARS counts every occupant death in a fatal crash, whatever the cause — it does not mean the vehicle was at fault or defective. Counts are not adjusted for how many of each vehicle are on the road. How to read this number

FARS 2024 data is an annual report file. NHTSA revises these records when the final file is published, so this count can change.

Why we show driver deaths too

Every vehicle has exactly one driver seat, so driver deaths line up fairly when you compare one model to another. Occupant deaths include passengers, so a three row SUV can show a higher number than a two seat car simply because it carries more people.

Both figures are plain counts, not rates. A rate would need to know how many of each vehicle are on the road, and that registration data is not public, so we do not publish rates or scores of any kind.

IIHS publishes driver death rates using this same driver only idea, paired with a registered vehicle years denominator we do not have. Their rates and these counts answer different questions, so do not read either number here as a safety rating.

Owner-reported problem signals

Separate from the federal fatality data above: complaints owners filed with NHTSA about this year and model. These are reports of problems, unverified, and are counted here only as signals.

complaints mentioning a crash

complaints mentioning a fire

Reviewed known issues for this vehicle

Typical U.S. ranges. Actual quotes vary by shop, parts choice, and vehicle condition.

How we estimate: Dealer = OEM parts × 1.4 + labor × $165/hr. Shop = parts + labor × $115/hr. DIY = parts only.

This maintenance schedule for the 2003 Mercedes-Benz SL-Class reflects Mercedes-Benz's published service intervals and the ASSYST Plus (Service A / Service B) system. Your actual service needs may vary based on driving conditions, climate, and vehicle usage. Always consult your owner's manual for model-specific recommendations.

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