A45lukeg

hi,
I recently purchased a 2015 A45.
I have noticed under heavy acceleration the car starts to jolt or jerk fairly violently almost as if the car is restricting me from accelerating.
I have spoken to Mercedes about it but they insist that its one of the safety features in the car. So i turned off all the features i could and gave it another try but it still jolts hard.
I just want to know if anyone else has experienced this problem? if so is it a safety feature or is it something i should be looking into.
Cheers,

Anto Vujica

You're not alone. I'm having the exact same issue. Quite annoying really. The jolting only stops if you fully release the accelerator for you as well? Let me know if you get more info regarding this.

ErikM

You are using premium fuel 91 or better?? Also you're not running it into rev limiter? Sound like what happens when bumping the limiter..

Anto Vujica

I have booked the car in for next week. I'll let you know how I go. I take care of the car and I never drive it cold. Only the Shell V-Power 98 goes into it (I'm in Australia)

Anto Vujica

I took my car to the MB dealer yesterday. He thinks it might be the plugs. I'll let you all know how I go after Thursday afternoon. That's when I'm due to pick the car up?

A45lukeg

i run the vehicle on 98 octane.
Move brought the vehicle back to Mercedes over a week ago. They found a fault in the transmission and engine.
they are currently in the process of replacing the main engine harness in the vehicle. I will update when I receive the car again. (I'm in Australia)

Anto Vujica

I used to work at the MB as a salesman where I took my A45. They only found that the reason for the misfires was my "Crankshaft Position Sensor". Got it all done for only the price of the sensor itself with no labour. I'll update you on how it feels after a week or so and if the misfires still occur. Please let me know how you go with yours A45lukeg

A45lukeg

I was told the same issue, however they replaced the sensor and they found the same fault to occur so they took the next step to replace the engine harness. I'm still waiting to pick up my car but I'll keep you posted

Anto Vujica

Looks like I'm going to have the same problem then. How much is the harness going to cost you?
I'm picking my car up this afternoon, I'll let you know if I have the same issue with just the sensor.

A45lukeg

Luckily I didn't have to pay because I've got warranty so I'm not sure. But I know it's a big job and can cost thousands unfortunately.

A45lukeg

i have had my vehicle back for about a week now and there hasn't been any further issues after they changed the main engine harness.

ManiacGT

I'd be making a formal complaint to the dealer now you've found it not to be a 'safety feature'!

Desmond45

TrentC

Hi. Can you tell me which dealships you were going to. I get this issue where when I accelerate hard at slower speeds it jolts super hard like brakes applied for split second.... Ive taken to Mercedes twice and they just say couldn't see and did a software update. It is still doing it though. Car is under warrantly and I want it fixed. Sadly it doesn't do all the time so hard to show the issue.

Rayner85

Hi

I have an 2015 A45 and all of a sudden it started jerking up a gear.

I have had 2 crank sensors changed and is still doing it.

Did the engine harness work (and continuing to work) as my local MB said the next step could be the crank itself which would be taking out the engine and everything in front?

Cheers in advance
Rayner