I started having this issue about 2 weeks ago where a few minutes (and sometimes seconds) after I turn the car on and start running, I'd get the notification to "Stop vehicle, leave engine running". I don't have any issues starting the car. I have gone pretty far to see if it would die to see if it was the alternator, but it's actually working quite well.I thought it was an issue with the main battery so I had it tested and the battery is good. Then I found that these cars have issues with the auxiliary battery so I ordered one since it's inexpensive, but I continue to get the message even after letting the battery charge. Anyone has had this issue in the past? Any ideas as to what it might be? I'd take any help I can get.

Your main battery is low on charge. How many days per week do you drive your car?How old is the battery?

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after i changed the main battery, that message never appeared again.

I've had the car for about a yese but according to the servixe history it has never been changed so I think it might be the main battery. I think I drive it enough for it to be charged us I did leave it a long time on (over an hr standing with the engine running) and it still shows it. When they tested the battery it shows it's still in the green area that means it's good for regular cars but I guess these cars require a bit more

There are few threads in main w205 forum for people who bought aftermarket non-oem auxiliary battery/capacitor that the similar message came up. Those who bought OEM, the msg went away.

As for your battery, I would figure out if aux battery is OEM or not first and have that solved and move on to the main battery whether to charge it more or buy a new one.

You need a new main battery. Not auxiliary. The auxiliary battery has it's own unique message and has nothing to do with engine running.

Thank you! I will be changing it tomorrow!

Bought a new main battery and a new auxiliary battery and still get the same message. Tested the Alternator and it works great (voltage between 13.7 and 14.8), and I still get the message to "Stop the vehicle, leave engine running". I'm really starting to hate the Mercedes Benz platform. Has any of you dealt with anything similar to this?

Solved it. Thank you all for your input.

Nice!

What was wrong with it?

I borough a iCarsoft v3 and it said that the "starter battery has excessive resistance". I found that someone had the same issue in this page https://static.nhtsa.gov/odi/tsbs/20...34790-9999.pdf. I checked mine out and it was that. Just cleared it and good as new now. The alert is gone and the eco/ stop and start is back.

I have just had the same message on my C63s.

More worryingly, when this message appeared, the engine started to idle very roughly, rev jumping between 600 - 1100 RPM. Has anyone else experienced this?

Thanks

Check the sparkplugs and see if there is carbon build up. Pull the code and see if there are any misfires. Maybe your alternator is not functioning and doing some weird ****. Check the voltage with your multimeter while revs jumping.

I had the same issue in the past, but the engine light started flashing meaning it was a misfire. For me it was the ignition coil#6 that went back. If you have an OBD II scanner it should be able to scan your engine. If you wanna solve it yourself and it might be a bit more complicated I'd recommend you to get an iCarsoft v2 or v3 for mercedes benz

Thank you, I’ll check the battery voltage and run a scan to see what comes up

My car was running rough recently. It had a strange vibration I could feel from the engine at high rpm (+3000). It had been there for a few weeks, not super noticeable but most definitely there. I tested the coil packs, bought new ones, and replaced them all one by one. It didn't help. Yesterday when I wanted to get the car out the engine suddenly stopped. I took it to a mechanic, but not having a car is very problematic for me because it's my main way of transportation. Luckily in a few days, my imported car should arrive soon.

Congratulations??

They could have just have display say "Battery Voltage Low, Leave Engine Running." instead of this cryptic none sense.

I had it happening to me, bought a brand new auxiliary battery, still did it. Bought a brand new main battery, still did it. It ended up going away on its own for awhile, but then when I let the car sit for a month and had to jump it, it came back on. I would say it was because of low voltage in the battery, but I put a trickle charger on it for a few days and then drove it 250 miles and it still did it. I think it’s because there’s so much going on with the car that it becomes stupid after awhile for lack of a better term. I haven’t heard of any “real fix” for this. Just peoples opinions and most or all are half right.

I had same warning when I start the car in the morning (below 12 degrees celsium) and I changed the battery and this warning gone

Just to clarify, did you clean up the terminal as shown in the bulletin you attached or did you only reset the error message with the scanner?