ECO start/stop feature
MBWorld Fanatic!
Joined: Feb 2014
Posts: 1,306
Likes: 40
E 350
Originally Posted by davidjohnbamber
As I understand the operation of ECO, it requires the aux battery that powers the starter to be almost fully charged to engage ECO, along with multiple other pre-requisites. When I owned a 2014 E350, it rarely would operate because my driving was basically all short trips. (3 to 5 miles) After a fault code started appearing at startup the battery was replaced. ECO would then operate after driving 5 +- miles. It would stop/start the engine once until driven further.
Senior Member
Joined: Jul 2010
Posts: 304
Likes: 6
From: Atlanta, GA
2016 E400 4Matic
Thanks for your input. That sounds more normal to me than what I am experiencing. My ECO start/stop feature does not become active until i drive a minimum of 10 miles. Usually more like 15-18 miles. I'm sure thats not right. When I take it in I'm sure they will see what I am talking about. I sure hope they dont test drive it until the green ECO light comes on becasue that will be a LONG test drive.
Senior Member
Joined: Sep 2007
Posts: 465
Likes: 118
From: Edmonton, Alberta, Canada
2016 S212 E400 RENNTech 345 whp/360 wtq
Just to throw a curve ball, my ECO has taken to turning itself back ON after I switch off! Happened twice yesterday. Switch it off shortly after starting out, confirm green light out, and within a half hour or so when I come to a stop in traffic (not the first stop) the engine quits. Look at dash and see ECO green light back on. Switch it off, engine starts back up and all is good until engine turned off and re-started later same day, then scenario repeats.
My biggest concern is if this is a software glitch, whats to say it won't just kill the engine while I'm driving!?!?! Called M-B customer relations who could only advise there are no recalls for that issue. Next stop is the local dealer.
My biggest concern is if this is a software glitch, whats to say it won't just kill the engine while I'm driving!?!?! Called M-B customer relations who could only advise there are no recalls for that issue. Next stop is the local dealer.
Super Member
Joined: Mar 2011
Posts: 998
Likes: 136
From: VA
W212 E-class, W211 E-class, F10 5-Series
There is a fuse in the trunk I have been told that is for the ECO button. If you pull it, it will only disconnect the ECO. I am sure you get a code but you do not have to press it anymore. The module I have just presses the button for me every time I get into the car with no fault codes.
