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ECO Start/Stop

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by icom102, Nov 29, 2017.

  1. icom102

    icom102 Member

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    I have the ECO start stop on my S Class on my C Class as soon as i stopped in traffic or lights the engine cut out and started when i took my foot off the break does it not work the same in the S Class the ECO light is yellow and the engine never turns off when i stop in traffic
     
  2. tode

    tode Senior Member

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    Hi,

    If the ECO light is orange it means the ECO function is not active. Either the conditions for activating it are not being met (a long list: cabin temp., battery charge, engine temp., misty windscreen etc) or you may have a problem with the Adblue.
     
  3. OP
    icom102

    icom102 Member

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    So its a different system from my C Class
     
  4. tode

    tode Senior Member

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    Are we talking about the car in your avatar (S350L Se Bluetec) ?
     
  5. Botus

    Botus Senior Member

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    I'd suggest this post is about right. The S will probably put comfort over economy and will probably need much more "charge" in the battery before this system is happy to cut the engine out. Based on the amount of kit and the fact a powerful car charger can sit for 24 hrs and the battery on an S class won't even notice. Its probably nearly always below the threshold for start stop to be active unless you have a great battery and drive at least 50 miles a day

    That said, a mate's 2015 C class never worked because the start stop control module was defective and was changed under warranty recently... and now it does
     
  6. OP
    icom102

    icom102 Member

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    Yes the S350L Btec

    Ans your mates does it work straight away or after a long drive?
     
  7. John Laidlaw

    John Laidlaw Senior Member

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    My 63 will work on the odd occasion I use ECO mode
     
  8. Botus

    Botus Senior Member

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    his drive to work is about 25 miles (each way)... in the first 6 months stops start functioned twice, the car had a software update and other work still never worked. had the module changed and now it does what u'd expect it to do
     
  9. Xtractorfan

    Xtractorfan Senior Member

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    Have you checked that it is activated, it may have been deactivated by the garage or a previous owner.
    Its not something that I would be extremely fond of on a big engined car. IT is bound to cause wear and major bills further down the road. Even though I've been told there is a different starter within the Gearbox/bell housing which operates the stop /start system.
    Some bumf here on stop/start.
    https://www.autocar.co.uk/car-news/new-cars/stop-start-long-term-impact-your-car-s-engine
     
    Last edited: Nov 29, 2017
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  10. OP
    icom102

    icom102 Member

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    Botus does it work straight away on your mates car?
    Xtractorfan well apart from the ECO switch down beside the command wheel can it be turned off anywhere else its lit in the dash but in yellow thow its supposed to be lit green
     
  11. Wabby

    Wabby Senior Member

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    This ^

    Also, my C Class never gets stop start anymore as I only drive 6 miles most days ... If it goes for a run over a weekend then stop start usually works for a day or two max.

    Think the battery needs to be almost 100%.
     
  12. tode

    tode Senior Member

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    Just to give you a basis for comparison, mine is 2011 350bluetec and in general the ECO works:

    Under 'normal' conditions (driven every day or two) >> on after about 3 miles.
    Ditto but very hot or very cold weather >>> on after 6 or 7 miles.
    If I've been fettling the car a lot, opening and shutting doors, radio on etc >>> may take 15 or 20 miles.

    The only time it didn't come on at all (even after a 50 mile drive) was when I had a HS NOx sensor and then the engine light came on after a couple of days.

    HTH
     
  13. rorywquin

    rorywquin Senior Member

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    Yep lots of short trips and it will be Orange.....
     
  14. EmilysDad

    EmilysDad Senior Member

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    I'd be pleased the stop/start didn't work :rolleyes:
     
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  15. LostKiwi

    LostKiwi Senior Member

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    Another annoying and generally pointless feature to go wrong....

    (and it shortens the life of the engine).
     
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  16. OP
    icom102

    icom102 Member

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    My old C Class it worked right after i started the car
     
  17. Botus

    Botus Senior Member

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    I'd be ecstatic if it were broken. Stupid idea for all the reasons listed by the others above.

    Can't say if it works well or not on the 2015 C class
    Can say on a 2011 one the owner liked it (I never understood why), on his replacement Audi A6 it leaves him stranded and causes dangerous situations at junctions (both were autos)
     

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