7G Tronic - wasn't able to switch from N to D?

Discussion in 'Engine' started by Mertz33, Jul 31, 2019.

  1. Mertz33

    Mertz33 New Member

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    Hi all,

    2007 CLK280 owner so the M272 with the 7G tronic transmission - was at a traffic light in Neutral and changed to Drive but no reaction, engine was revving fine yet car not moving forward.

    Went back and forth between Neutral and Drive few times without success then I pressed the Sport button (was in Comfort before) and clank, the car was moving again..

    The whole things lasted enough for the light to go back red - I wonder why did this happen?

    Cheers
     
  2. dynamicq

    dynamicq Active Member

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    Could be the fact that in sport it starts in first gear...could the frictions be worn out... You can see the gearbox wear indication (adaptation values) in Xentry. Your local indie should have it. Does the gearbox kicks normally or smoothly changes the gears, what's the milage. Does it have gearbox service history.

    Sent from my Mi A2 using Tapatalk
     
  3. zipdip

    zipdip Hardcore MB Enthusiast

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    If it does it again,put the car into park and switch it off then start it again and see if the car goes,as per the previous post,get it to a indy and get the box tested,you may beed the speed plate repaired,it just might need a service.
     
  4. whitenemesis

    whitenemesis MB Club Veteran

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    Why were you in neutral?
    Handbook recommends staying in drive unless stopped for a prolonged period.
    Probably of no relevance to your issue but just curious.
     
    DSM10000 and NDFR like this.
  5. slade1

    slade1 Hardcore MB Enthusiast

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    Had similar problem with my 05 ClK 7 speed, new electroplate.
     
  6. renault12ts

    renault12ts MB Club Veteran

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    I wonder if you would have to do this during a driving test?
     
  7. BlackC55

    BlackC55 Authorised Forum Sponsor Authorised Forum Sponsor

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    Low fluid level can cause this. Id get it plugged in firstly.
     
  8. OP
    OP
    Mertz33

    Mertz33 New Member

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    Location:
    London
    Car:
    CLK280 Coupé
    Thanks all for your replies, I've been away for a while.

    The car has done just under 60k, gear change is smooth has a (full?) MB service history although I haven't seen any mentions of the gearbox.. This was the only time it happened and seemed more electronic than mechanical (other people also told me to switch off & on again).
    Will take it to a garage to have it checked..
     
  9. OP
    OP
    Mertz33

    Mertz33 New Member

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    Which Handbook? :)

    If it's a short stop, something like 30 seconds yes, I wouldn't bother but otherwise I don't see the point having that extra load on the torque converter when I know I'm not moving forward..
    I was something like the 5th car at the light and it was a longer red that I knew of so of course I would wait in neutral-


    Cheers
     
  10. whitenemesis

    whitenemesis MB Club Veteran

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    The owner's handbook.
    Here's a (lengthy) explanation as to why shifting to N at lights is not recommended.
    Use of Neutral Gear in Automatic Transmission
     
    Jockcl500 likes this.
  11. Jockcl500

    Jockcl500 Active Member

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    That is a good description of what is going on, I never use neutral(unless I am working on the rear brakes and then the engine is turned off), only park to reverse to drive and to park again.
     

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