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C250 hesitant acceleration

Discussion in 'Engine, Drivetrain, Fuel and Exhaust' started by RadiumRob, Apr 1, 2019.

  1. RadiumRob

    RadiumRob New Member

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    Your Mercedes:
    C250 AMG line 2014
    Car is a 2014 C250 AMG line 2.1 Litre Bluetec Auto. 54000 miles.

    The car consistently hesitates on acceleration at moderate speeds, it's as if the engine doesn't respond to the accelerator being pressed. If I kick-down the car usually accelerates rapidly as expected. It never happens at low speed around town, and nearly always happens when driving up hills. Sometimes the car will seem to jolt before acceleration picks up. A MB specialist garage (not dealer) could find no codes.

    I'm hoping there's a reasonably-priced fix for this. My PCP expires in October and I don't want to spend so much that it commits me to keeping the car rather than renewing.

    Grateful for any ideas.
     
  2. John Laidlaw

    John Laidlaw Senior Member

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    Surprised indeed there were no codes on star, guess throttle pedal itself could be a culprit.
    Are you sure your independent has the right diagnostic?
     
  3. OP
    RadiumRob

    RadiumRob New Member

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    I'm not certain he has the correct diagnostic. He's an ex Merc tech now specialising as seen independent. I guess it may be time to bite the bullet and take it in to MB for diagnosis.
     
  4. John Laidlaw

    John Laidlaw Senior Member

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    Or another independent who you know has Star diagnostic would be better- where are you based? Maybe we can recommend someone
     
  5. OP
    RadiumRob

    RadiumRob New Member

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    C250 AMG line 2014
    I'm in Dorchester, Dorset. Is there someone local?

    Thanks
     
  6. John Laidlaw

    John Laidlaw Senior Member

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    I believe @AMGeed uses Star Tech in Poole, hopefully he’ll see this and confirm....
     
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  7. Wighty

    Wighty Senior Member

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    MBS Southampton (Indy) are top of their game an hour from you (regularly on the forum )
     
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  8. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    Your Mercedes:
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    Sounds like potentialy a torque converter lockup issue or other gearbox related issue.
     
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  9. AMGeed

    AMGeed Senior Member

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    Your Mercedes:
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    Star-tech in Poole is the nearest MB indy to you in Dorchester. Be sure to ring beforehand to make an appointment.
    They do have the same Star diagnostic equipment as the main dealer but their labour charge is around 50% less at £69+vat per hr.

    MBS is where I prefer to take my E55, just because Cole has been servicing all my cars for a long time and I have bult a good relationship with them.
    Star Tech are, however, very good. Do check if they have a courtesy car in case you have to leave yours for a more extensive repair that can't be completed in a day.
    https://www.google.com/maps/dir//Go...537a0b1426eaa97!2m2!1d-1.9932337!2d50.7413074

    https://www.star-tech.co.uk/
     
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  10. OP
    RadiumRob

    RadiumRob New Member

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    Thanks.

    Looks like you're right. Had the codes read, it showed P278300 - friction power of the torque converter is too high, also U012200- communication with control unit 'traction system' has a malfunction'.

    Any idea what might cause these?
     
  11. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    On 5G's its commonly the lockup solenoid. Could be a few things, but that would be where I would start. Easy to rule out with Xentry.
     
  12. OP
    RadiumRob

    RadiumRob New Member

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    Thanks.

    I have the Xentry printout, what should I look for?
     
  13. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    You need to go through the diagnostic procedure, not just the codes unfortunately.
     
  14. OP
    RadiumRob

    RadiumRob New Member

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    Ok, thanks. It's booked into MB in a couple of weeks time, I was just hoping to get a handle on the likely costs.
     
  15. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    Mercedes-Benz C32AMG, SL55AMG, C320CDI Sport Edition Estate and SLR McLaren Coupe Roadster.
    Can you post it here? Just as a double check?
     
  16. Wighty

    Wighty Senior Member

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    The handle on the costs are it will be at least twice as expensive at MB than an Indy . Your choice obviously but the forum will collectively take in a sharp intake of breath as to why you wouldn't visit either of the two indys ?
     
  17. OP
    RadiumRob

    RadiumRob New Member

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    That's what I feared, but the car is in a contract plan and I don't want any problems in six months time when the plan expires. Tbh, I'm not clear on what's permissible re non-MB work on PCP CARS.


    Of course, spending a few £k to sort a lousy transmission on a relatively low mileage car doesn't endear me to MB so I won't be after a new one, nor will I be keen to hand over this one. It will be interesting to see how it pans out.
     
  18. alexanderfoti

    alexanderfoti MBO Forum Supporter Authorised Forum Supporter

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    We use MB genuine parts, and keep the system up to date RE repair work, and keep warranty etc intact. Do read the fine print, but EU legilstation says that the owner cannot be forced to use the main dealer, and you cannot sign away your legal rights.
     
    Last edited: May 15, 2019
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  19. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    You are right to be careful. Lots of PCP and lease agreements state that the car must be main dealer serviced.

    However in the case of a mechanical failure or wear and tear components such as brakes they make no such insistence. You would be safe to visit an Indy for this kind of problem.
     
  20. Steve@Avantgarde

    Steve@Avantgarde Forum Supporter Authorised Forum Supporter

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    I have somehow missed this post. That is a fault code I have seen before and there is a TIPs document on it. Flush the ATF and update the software, if that doesnt cure the problem then you have to replace the TC.
     

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