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My Stop Start has disabled itself because the auxiliary battery or main battery isn't 100% , it started when temps got below 10 C and hasn't come back since , must be a few months now.
Certainly something one could do for the summer , but The Beast from the East made things interesting earlier this year .
My Stop Start has disabled itself because the auxiliary battery or main battery isn't 100% , it started when temps got below 10 C and hasn't come back since , must be a few months now.
Certainly something one could do for the summer , but The Beast from the East made things interesting earlier this year .
I was incorrect , it wasn't lower ambient temperatures affecting the batteries it was a brake booster vacuum sensor a prerequisite of Stop Start.
I've since seen a few 'cures' one is to remove a connector from the main battery negative lead , but this disables the brake HOLD function which I like .
Upon getting caught out with the horrid SS by forgetting I resumed my hatred as such was it I was in danger of becoming a Sith , lol .
I found disconnecting the auxiliary battery fuse
But I simply pulled out the 7.5A fuse blade , and...
I'm very happy , no Stop Start and no concequences.
Sold in 2026 - A207 E200 Cabrio - on to greener pastures
Another fuse puller here since at least 6 months and thousands of kilometers, with no problems at all. The only thing I still would like to see confirmed is that there is not an OBD error code stored.
Take care!
I know this is an older post, but I came across it and thought I would put in my 1/2 cent If you have a scan tool ( does not have to be Xentry) you can variant code it and disable it. I did it with mine with an OBDII tool called " Thinkdiag" was about $100. I was also able to stop the annoying seatbelt chime since it takes me more than a split second to put on my seatbelt lol. I did a few other things to it aswell, but this is about eco start/stop So I wont bore you with my nerdy details
I know this is an older post, but I came across it and thought I would put in my 1/2 cent If you have a scan tool ( does not have to be Xentry) you can variant code it and disable it. I did it with mine with an OBDII tool called " Thinkdiag" was about $100. I was also able to stop the annoying seatbelt chime since it takes me more than a split second to put on my seatbelt lol. I did a few other things to it aswell, but this is about eco start/stop So I wont bore you with my nerdy details
I'd be very careful messing with the codes if you don't know what you're doing. Sounds like it's a bit like trying to edit Windows or iOS operating systems — not something the average user should attempt.
I recently picked up a 15k mile 2015 E400 Coupe, which I really like other than the miserable ECO button. Took the advice of this thread, and pulled fuse #91. The stop/start system has now been sent back to the hell from which it came.
Picked up a beautiful 2014 C207 this weekend, pulled fuse 91 and the Eco Start Stop is gone! Thanks to the original
poster. Excellent solution to an annoying problems. Well over 1,000 miles and everything works as it should.
Picked up a beautiful 2014 C207 this weekend, pulled fuse 91 and the Eco Start Stop is gone! Thanks to the original
poster. Excellent solution to an annoying problems. Well over 1,000 miles and everything works as it should.
Picked up a beautiful 2014 C207 this weekend, pulled fuse 91 and the Eco Start Stop is gone! Thanks to the original
poster. Excellent solution to an annoying problems. Well over 1,000 miles and everything works as it should.
Thanks again.
The trouble with pulling fuses is, sometimes they put more than 1 component on a single fuse.
Labeled, ECO start/stop function. Front SAM control unit.
I'm curious what this fuse 91 is specifically disabling. My '19 G550 uses the main battery and the 12 volt starter for ECO S/S operation. There are a variety of sensor based conditions that determine when the S/S is functional and when it is suspended. Battery charge status and engine temperature are the 2 most apparent, but there could be others. Nothing in my fuse chart is identified as ECO S/S. Prior to coding it off, I had the battery sensor LIN bus connector removed, which had the effect of informing one of the ECUs that the battery charge status could not support starter operation. Fortunately, this hack never cause a CEL, although an OBD scan would return a fault code identifying a defective battery sensor. Nothing else was ever affected. AFAIK, my battery sensor has no dedicated fuse. I haven't had the cargo floor access open for quite some time, but as I recall, the battery sensor uses a 12V connection directly from the battery's + terminal for powering its internals, and it might be internally fuse protected.
I'm curious what this fuse 91 is specifically disabling. My '19 G550 uses the main battery and the 12 volt starter for ECO S/S operation. There are a variety of sensor based conditions that determine when the S/S is functional and when it is suspended. Battery charge status and engine temperature are the 2 most apparent, but there could be others. Nothing in my fuse chart is identified as ECO S/S. Prior to coding it off, I had the battery sensor LIN bus connector removed, which had the effect of informing one of the ECUs that the battery charge status could not support starter operation. Fortunately, this hack never cause a CEL, although an OBD scan would return a fault code identifying a defective battery sensor. Nothing else was ever affected. AFAIK, my battery sensor has no dedicated fuse. I haven't had the cargo floor access open for quite some time, but as I recall, the battery sensor uses a 12V connection directly from the battery's + terminal for powering its internals, and it might be internally fuse protected.
All good questions, perhaps they can plug a scanner in and see if there are any codes related to this fuse.
Sold in 2026 - A207 E200 Cabrio - on to greener pastures
^^ above post is interesting.
Recently I purchased the Launch Creader elite for MB and discovered that I have stored the following code: U1138 communication fault with the auxiliary oil pump in 7G-tronic transmission. Apparently, the aux pump is there for the start/stop system so that the gear can engage immediately.
In a later step I will reinstate fuse 91 and do the variant coding to switch start/stop to remember last setting. When done (this might take a while) I will report back.
Take care,
Siepel
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because the auxiliary battery or main battery isn't 100% , it started when temps got below 10 C and hasn't come back since , must be a few months now. 
If you have a scan tool ( does not have to be Xentry) you can variant code it and disable it. I did it with mine with an OBDII tool called " Thinkdiag" was about $100. I was also able to stop the annoying seatbelt chime since it takes me more than a split second to put on my seatbelt lol. I did a few other things to it aswell, but this is about eco start/stop So I wont bore you with my nerdy details 
