Intermittent stop start
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Senior Member
Joined: Jan 2009
Posts: 290
Likes: 22
From: Weaverville, Ca
1992 MB 190E, 2016 MB C300
Intermittent stop start
My stop start quit working. Since the car had been sitting, I charged the battery. No luck. Later it began working intermittently. I don’t like the stop start, but wondering if I might have a bigger pending problem. Any thoughts?
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Joined: Mar 2006
Posts: 4,278
Likes: 379
From: San Jose area
'19 E63S sedan
It could also be the aux "battery," which is not really a battery but a capacitor bank that has a high failure rate. Or it could be a lot of other things. Even hot weather, where the car engine needs to keep running for the air conditioner compressor to be able to maintain your set point.
Junior Member
Joined: Mar 2019
Posts: 27
Likes: 8
From: Dallas, TX
2015 Mercedes-Benz C300 AMG-Sport Package
I've noticed that if you let the car sit for sometime the auto start/stop becomes inoperable. I've had my 2015 C300 sit for a couple of days at a time before starting it back up, and it won't have start/stop working right on the cold start. It needs to be driven daily for it to work right on startup. Don't worry though as I doubt there's anything wrong with your car actually.
Senior Member
Joined: Apr 2014
Posts: 299
Likes: 41
From: England
W205 C200 AMG Line Premium
Does it work after a long journey,say 70 miles or so? Sounds like mine and after the investigation I undertook I think that the main battery needs replacing but I am reluctant to do so because the car starts fine.
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Member
Joined: Oct 2019
Posts: 145
Likes: 32
From: Cheshire UK
C200
If the car has been sat around doing nothing, its perfectly normal for the stop/start to stop working as the battery will naturally deplete. My car is only getting used once a week or so at the moment and its the same. I did 50 miles in it the other day and its now working fine.
Agree with the comments though - best to turn it off (first thing I do when the car is started).
Agree with the comments though - best to turn it off (first thing I do when the car is started).
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Senior Member
Joined: May 2019
Posts: 431
Likes: 86
C400
the whole thing works of a 2 prong plug on the negative cable of the battery under the hood
to disable the stop-start system, just unplug that thing. It won't throw any codes or cause any problems
if that thing is loose, it will work intermittantly
to disable the stop-start system, just unplug that thing. It won't throw any codes or cause any problems
if that thing is loose, it will work intermittantly
