Electrical System Problems of Mercedes Benz SL550

I purchased this vehicle in a private sale in September 2025. The battery warning light was on and the radio was not working either. I had the vehicle inspected by the mercedes dealer and was told the batteries were being drained because the bcm (battery control module) I was told there was nothing they can do because mercedes discontinued the replacement parts. So I started to investigate the bcm issue in this model and come to find out when they go bad the vehicles will get on fire, many owners around the world have posted the burned bcm & cars as well. I manage to take my bcm out and opened for inspection and is burned out, I was lucky the car did not catch fire. I have pictures. This should be a recall, anything that could ignite the vehicle should be a recall.

See all problems of the 2007 Mercedes Benz SL550 🔎.

I'm reporting a serious safety issue affecting all mercedes-benz r230 series sl roadsters, model years 2003–2012, of which approximately 85,000 were sold in the united states: • there are numerous reports on r230 sl owners' online forums that an electrical device located in the trunk of these vehicles known as the bcm [battery control module] is prone to catastrophic failure and melt-down. • the failed bcm can subsequently catch fire – potentially destroying the vehicle and endangering lives and property nearby. See photos attached from one sl owner's experience. • mbusa, its dealers, many sl owners, independent service centers and salvage yards are aware of this problem: multiple reports detailing it can easily be found on the internet. Possible modifications to alleviate the danger have been affected by some sl owners, one picture of which has been uploaded here. • mercedes-benz is surely aware of the issue but has not recalled nor issued tsbs associated with this serious problem, nor has mbusa acknowledged that vehicles modifications to alleviate the risk of failure and subsequent fires have been developed by owners and mechanics. • no symptoms are known to appear prior to melt-down, other than odors and/or smoke emanating from the sl's trunk. By then, it is too late. I respectfully request NHTSA open an investigation into this issue and require mercedes-benz address it by affecting modification or replacements of the faulty bcm system components in r230 vehicles.

See all problems of the 2009 Mercedes Benz SL550 🔎.

This particular model 2009 mercedes sl 550 hardtop convertible 5. 5 liter motor has two batteries and accessory battery that battery that’s located in the trunk in the main starting battery that’s on the firewall. These batteries are both new in oem recommended. If the car sits for 24 hours, it will not start. The electrical system is completely drained. There are many forms describing the same issue but yet the sl model is not included in a civil lawsuit. Mercedes-benz definitely knows they have an issue in somehow it needs to be rectified.

2017 Mercedes Benz sl 550. Consumer writes in regards to defective pre safe option on vehicle. The consumer states the safety belts tighten restricting and distracting the driver when it is unnecessary to do so. The failure occurs in one particular spot where two metal plates overlap in the street.

See all problems of the 2017 Mercedes Benz SL550 🔎.

Complete failure of the instrument cluster. . . Fuel gauge / odometer / speed / tachometer / turning signals / temperature.

Tl-the contact owns a 2009 Mercedes Benz Sl550. The contact stated that while trying to exit the vehicle, the door handle fracture and all of the doors automatically locked and the contact was unable to exit the vehicle. The vehicle was taken to a dealer where it was diagnosed that the computer's theft system engaged once the door handle fractured and needle to be reprogrammed. The vehicle was repaired. The manufacturer was made aware of the failure. The failure mileage was 60,000. Sg.