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Eco 0n CLA 250 Start-Stop rarely works

Discussion in 'Electrics, Vacuum, Ignition and ECU' started by springbk, Sep 1, 2019.

  1. springbk

    springbk New Member

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    Joined:
    Jan 10, 2011
    Location:
    Milton Keynes
    Your Mercedes:
    CLA 250 AMG Line 4MATIC Shooting Brake 2015
    I have a 2015 250 CLA AMG Line and I have noticed that my Eco Stop Start rarely works. Now I know I do not drive very far every day but when I first got the car it worked on 90% of my journeys even my short ones. Now even after a 100 mile journey it does not always work. Wondering if the battery needs replacing or is there something else I should look at and If I do change that battery do I do both? I have also noticed that if I stop and then restart the car a few times from time to time this will bring it back on.
     
  2. Gazwould

    Gazwould Senior Member

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    S204 OM651
    Excellent news , leave it as it is .
     
    Botus likes this.
  3. grahamcol

    grahamcol Senior Member

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    Your Mercedes:
    2001 SLK230, 2007 CLK220 CDI
    As above. I hate stop start.
     
  4. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Location:
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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Using the diag tools, we can identify what is preventing the car from entering stop start mode. Its most commonly the battery, but there are 20+ parameters that must be met.
     
  5. OP
    springbk

    springbk New Member

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    Joined:
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    Your Mercedes:
    CLA 250 AMG Line 4MATIC Shooting Brake 2015
    Thanks for this information, You are a little out of my way, Tonbridge vs Milton Keynes. Probably start with replacing the battery and then I think I will go see my local non MB garage....
     
  6. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
    W221 S65 AMG - W204 C63 AMG + Various other MB's
    Yeah, that is a fair trek! There are a few indies close by to you I believe.

    They will need MB Xentry diagonistics to check the cause.
     
  7. malcolm210

    malcolm210 Senior Member

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    You are right the battery needs to be healthy 12.6 volts (engine off) for the Stop/Start to function. I hate the system but it does act as a good battery indicator. I changed my original AGM battery early this year and the Stop/Start operates within a distance of 1 mile in this warm weather where prior to this it wasn’t operating at all
     
  8. ioweddie

    ioweddie Senior Member

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    Location:
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    Your Mercedes:
    W205 AMG Sport Line Premier Plus Estate C220d
    get yourself a CTEK Battery Conditioner
     
    springbk likes this.
  9. OP
    springbk

    springbk New Member

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    Your Mercedes:
    CLA 250 AMG Line 4MATIC Shooting Brake 2015
    Thanks will look into this.
     
  10. OP
    springbk

    springbk New Member

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    Your Mercedes:
    CLA 250 AMG Line 4MATIC Shooting Brake 2015
    Thanks. Yes there is one that I like to use, namely Autoclass. Just out of interest, what does the AUX Battery do? Does this affect the use of of Auto Stop/Start?
     
  11. CowleyStJames

    CowleyStJames Senior Member

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    Joined:
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    Location:
    Oxford
    Your Mercedes:
    Mercedes-Benz C-Class Estate C200 CDI BlueEFF. Executive SE 5dr
    I've just replaced my AGM stop/start battery last week in my E Class.
    Don't bother trying to charge it, they're so small that you'd be wasting your time.
    I tried charging mine a couple of times on the AGM setting on my Ctek charger, but the next day I had Auxiliary Battery Malfunction come back up.
    Buy a new one, 15 minutes to change and mine was a Yuasa
    OEM copy for £36.
    Even the original captive bolts just screwed straight in
     
  12. John Laidlaw

    John Laidlaw Senior Member

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    The aux battery does the stop/start
     

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