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Auto stop/start not working

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Auto stop/start not working

 
Old 12-01-2018, 07:23 PM
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Auto stop/start not working

Noticed on my wifeís 18 E400 Coupe with 4400 miles that the auto stop/start feature is no longer working. Strange, because the light in the center console for it is on.
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Old 12-01-2018, 10:56 PM
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Many reasons why it can stop working. On my old E250BT4, it stopped working due to battery failure. Both primary and auxiliary battery had eventually gone bad. This was due to an oil-soaked alternator a year prior, which caused undervolting. Even with a new alternator, the batteries had suffered too much damage. After new batteries, it worked again. The diesel engines are a lot less friendly to auto start/stop. However, my E300W4 seems much happier to start/stop normally, which I would bet is the case with your E400. Have your dealer check the batteries. It took my dealer a good bit of time to finally agree with me that it was the battery. Initial tests showed it wasn't the battery, but some digging finally proved it.
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Old 12-02-2018, 09:31 AM
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Several conditions must be met for start/stop to activate. I see that you are in SW Florida. Is the A/C running? A/C keeps start/stop from activating in my car.
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Old 12-02-2018, 11:30 AM
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Originally Posted by ua549 View Post
Several conditions must be met for start/stop to activate. I see that you are in SW Florida. Is the A/C running? A/C keeps start/stop from activating in my car.
No. And there were many times in the past that it did work with the AC on as well.

Last edited by dudley07726; 12-02-2018 at 11:34 AM.
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Old 12-02-2018, 12:39 PM
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The system has a lot of variables before it will work like car temp outside temp length of journey battery state etc etc. On my c class the auxiliary battery fail message eventually appeared when the car was 2 yrs old and it was replaced. Ours works a lot less in winter than in summer i presume because some of the temperature parameters are not met.
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Old 12-02-2018, 03:05 PM
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Count your blessings!
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Old 12-02-2018, 05:58 PM
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Count your blessings!
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Old 12-04-2018, 02:07 AM
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Originally Posted by dudley07726 View Post
Noticed on my wifeís 18 E400 Coupe with 4400 miles that the auto stop/start feature is no longer working. Strange, because the light in the center console for it is on.
Is the icon on the instrument cluster yellow or green?

PS. most owners want it to stay off.
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Old 12-04-2018, 07:16 AM
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Originally Posted by Diesel Benz View Post
Is the icon on the instrument cluster yellow or green?

PS. most owners want it to stay off.
will check. Yes, I know most owners want it off. But for me, it may mean something is wrong and needs to be fixed while under warranty.
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Old 12-04-2018, 08:46 AM
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AFAIK US models only show a green icon in the lower right of the display when eco is active. If eco is not active there is no icon displayed.
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Old 12-10-2018, 05:02 PM
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Turned out to be a weak battery. Battery was replaced under warranty. Surprised as itís just 1 year old.
Works perfect now.
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Old 12-10-2018, 05:53 PM
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Originally Posted by bytemaster0 View Post
Many reasons why it can stop working. On my old E250BT4, it stopped working due to battery failure. Both primary and auxiliary battery had eventually gone bad. This was due to an oil-soaked alternator a year prior, which caused undervolting. Even with a new alternator, the batteries had suffered too much damage. After new batteries, it worked again. The diesel engines are a lot less friendly to auto start/stop. However, my E300W4 seems much happier to start/stop normally, which I would bet is the case with your E400. Have your dealer check the batteries. It took my dealer a good bit of time to finally agree with me that it was the battery. Initial tests showed it wasn't the battery, but some digging finally proved it.
Correct. If the system is not working you are probably having battery issues. Try a trckle charger. If the problem persists its time for adealer visit.
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Old 12-10-2018, 10:32 PM
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Glad they found and replaced the battery. Same happened to me on my old E250BT4. Both batteries went bad within a few months. Due to a prior alternator failure a year before. Excellent point on it being a sign of a failure, that's the first thing I thought as well when I encountered the issue.
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