digitallust_aus

So I have just hit 10,000kms at 11 months.. and I am still very much loving my W205. A few niggly problems here and there but Westpoint Star seem to be onto it quick enough.

Issue that I have that is that a) my dealer is 550kms from me so I usually have to do a bit of research into my issue before dropping it off at the dealership, so it gets fixed right, the first time.

The past few thousand kilometres has me stumped and is one of those issues that you can't just reproduce at will.

Every two to three weeks a problem pops up where whenever I accelerate from a full stop or very slow give way situation there is a huge delay before the engine responds and the car takes off.

Anywhere from 5-10 seconds, which is huge.. numerous times I have rolled through the stop/give way sign being unable to make the car accelerate.

Both the engine and transmission still run faultlessly but its like it loses connection between the accelerator and the engine/transmission.

I can pump the accelerator numerous times with no response... even with the pedal flat to the floor , nothing nothing nothing, then ever so slowly the car will pick up speed. It will do this more often than not throughout the rest of the day. Next day, it drives perfectly fine. Go figure?!

Transmissions Issue?
Turbo issue?
Software issue?

In all my years and cars I have never encountered something so random.
Anyone else heard of such a problem? I can see the fun I will have this time around at the dealership when I drop the car off and the car won't play up.

twinturbo6

You are not alone. I had a similar issue occur about a month ago. I was on the interstate traveling 70 mph when the accelerator became unresponsive.

At first my service department said they couldn't do anything unless it could be replicated. I refused to drive the car off the lot and it has been siting there since 1/13. Someone from MBUSA came to look at the vehicle but there is still no resolution.

I've done my own research and have found reports dating back to the 2012 model year and across most MB models. It was a very common issue for the 2014 CLA.

It's a very dangerous problem and should be addressed by your dealer.

If you visit safercar.gov you can see the dozens of similar complaints from other drivers and it will give you more ammunition when you go visit your dealer.

digitallust_aus

Very interesting read at safercar.org.... It is a very dangerous issue, something that I hope is fixed sooner rather than later.

Maritime

Link? I can't find it.

twinturbo6

If you visit the Vehicle Owners tab and then select a vehicle, the reports are listed under the complaints tab.

Here is the link for the 2015 C300 then select complaints...
http://www-odi.nhtsa.dot.gov/owners/...od_ids=1977331

pvecchio99

@digitallust_aus - did you ever solve this? I have a 2012 C250 and have exactly the same issue you described. The dealership is not finding any fault codes. The problem can't be reproduced.
The car is too dangerous to drive.
Anything you can provide will be helpful.
Thank you,

Mr_marko77

Otto Auto

if the car is still under 2 years, you can consider exercising the lemon law.

kleinebin

Excuse the non technical description, but I've had the issue of when slowing down to giveway or roundabouts that the car is very slow to accelerate again, up to 5 secs after accelerating.

Dealer acknowledged it's a software issue where the car tries to anticipate your driving style and knows you slow down in such situations.

They can wipe the car's memory of your driving and it fixes it for a few months until it happens again.

andtoniom

Think you may be talking about the turbo lag. What mode do you drive in? I remember other threads on here talking about mitigating that by driving in Sport mode and/or looking into a tuner.

pvecchio99

I've experienced the issue in both modes. Rode mostly in Economy, then switched to Sport. In Sport mode is where I had a much more debilitating experience. Instead of the usual few second lag, the accelerator completely disengaged for 30 seconds. Had to pull over in the emergency lane. Tried pushing on the gas pedal and ultimately plunging it to the floor. Nothing. Was thinking about who to call first and then it re-engaged. I don't remember if it righted itself when I put it in Park or if it happened just afterwards.
Since it seemed like it was getting worse, I couldn't help but think it's more of a switch or sensor on the fritz and not just driving habits.
So frustrated that it doesn't show any fault codes, not sure how the dealer is going to fix/resolve it.
Two weeks in the shop now...

digitallust_aus

Hey, thanks for the message. To be honest, it did it quite a few times over a six month period then it just never occurred again. The service centre could never fault it when it was in with them.
I sold the Mercedes to a friend back in Feb of this year. He said it hasn't missed a beat in any way shape or form. Sorry I couldn't offer any further help.

GSOTXL

Something like this happened on my W204/MY13 C300 in the last year of its lease....the dealer found some fault code that they said was 'unknown' and had to calll it in for more support. There were no clear remediation steps other than to 'reset the system', if I remember it right, and fortunately it never happened again. It happened just a little bit away from home, but had it happened on a highway it would have been pretty scary and dangerous. I've got a MY19 C300 on order and really hope this issue isn't present in the 2019s.