2023 S580e with only 600 miles and check engine light came on today on the way home from work. Car dropped off the dealership already.

super frustrating!

 

Keep us updated…

 

Welcome to the wonderful world of post 2020 Mercedes-Benz!

 

It might be this: https://www.tsbsearch.com/Mercedes-B...54-21-P-076055

If it is, it is harmless per MB. It will eventually go away on its own after so many start/sleep cycles. Although why they can’t “fix it” is a mystery.

 

dealer said they are still trying to diagnose. We shall see if they come up with anything.

 

I'll chime in here since two weeks into my ownership, my S 580e's "Check Engine" light turned itself on. Thankfully, this Forum provided me with some insight into the operation of the electrical systems, both 12 volt and the high energy propulsion system.

For the first week of ownership, I spent each evening in the car (located in my attached garage). I had the car plugged into my Level 2 charger, and kept the ignition in "Accessory" mode to keep the dashboard and computers functioning so I could learn about the car and set up my various settings, presets and favorites. After spending an hour or two each evening, I shut off the ignition, exited the car, and went inside the house, leaving the car's fob in a small dish with other fobs for my other cars. Mind you, this key dish was only about 10 feet from the car itself, albeit with a wall and door between the two.

After reading here that the car's electrical system continues to energize the vehicle if the car is left unlocked, and the fob left within 10-20 feet of the car, even though the ignition is off, I am convinced that the 12 volt battery had substantially discharged itself which triggered an electrical fault thereby triggering the Check Engine light.

When the light went on, I called my dealer's service department. Their earliest appointment to look at the car (less than two weeks old), was two weeks out. So, that's when I put two and two together and surmised that the 12 volt battery had lost its charge, and, given the fact that the 60 mile range of my car's battery, my internal combustion engine had not fired up since I drove it home from the dealership two week in the past, there was no opportunity for the 12 volt battery to be charged through the ICE alternator.

So, I placed the car's 12 volt battery on my battery tender, and began locking the car in my garage and leaving the fob outside the 20 foot range. After 24 hours on the battery tender, the car's 12 volt battery was showing a full charge. Then, I drove the car in SPORT mode for a few hours, hopefully assuring the alternator was working properly to keep the 12 volt fully charged. Lo and behold, the next morning, the Check Engine light was off. More importantly, keeping the 12 volt on a battery tender when using my other cars, and keeping the car locked and the fob sufficient distance from the car, I think I've nailed the problem, and it hasn't returned. I canceled the Service Appointment the next day.

I apologizes for rambling on here, but ownership of this type of car takes some educating and getting used to the car's idiosyncracies. That being said, I'm loving the car, but it has been a big change from the Audi A8 e, I traded for the Benz. The Audi's ergonomics are better, but the electric mileage of 55-60 miles far exceeds the Audi's 20-25 miles. That, in and of itself, was worth the change.

 

Yeah a Faraday pouch for the key fob is a must. You don’t have to worry about distance provided it’s in that pouch, and it also ensures the car goes to sleep and the handles will pop out when you approach the car.