Evening all. 

I recently purchased a '15 2.0 powershift. 

When bought, The car recently had the gearbox done with all the bells and whistles. Then after a month car started behaving funny. I got the gearbox flushed as advised.

Basic description of issue. 

Car starts and runs perfect when cold. 

6 mins later. 

The rev counter starts jump see vid below. 

The car have a jumping/forwards and backwards Motion. 

 

This only happens when I'm not appealing extra pressure to the accelerator pedal. When coasting or slowing down this happens. The wife is convinced the first time she felt it was 60 seconds after fueling the car at tescos. 

 

The longer the car runs the worse it gets. After 20 mins or so it even does it in drive at when stopped at the lights. 

I dont feel safe driving it now, I only Purchased this for the twin boys(loads of space). 

If I fleexe/horse the car drives perfect, it goes through the gears like a dream. 

££££££ wasted. 

Thanks guys

 

 

 

 

 

That looks like an engine, not transmission issue.

Get it checked out.

Make sure the battery voltage is good

On 5/23/2024 at 9:25 AM, DaveT70 said:

That looks like an engine, not transmission issue.

Get it checked out.

Make sure 

Took a mechanic today. No faults on transmission or engine. It did read body control module fault. 

Interestingly I discovered it was remapped before the gearbox was sorted?? 

 

I'm taking to a tuning specialist to have it removed then go from there? Would this be correct 

I doubt the remap is causing that issue

It looks like you have a BCM fault, especially if you have a BCM code

Evening Nialld,

I purchased a '16 Galaxy a month or two back that did a very similar bouncing revs on the motorway within half an hour of driving away but also felt a bit like it was sitting up and down with each bounce also. By next night I had the 'transmission limited function' message flashing up and AA advised when they came to recover it back to the selling garage that they could see before codes relating to comms issues between modules that showed over the last 1,000 miles or so ( which the AA inspection is had done a few days before hadn't picked up annoyingly just using a standard obd scanner!).

Not sure what the ultimate diagnosis was as I returned the car to the garage the next day as didn't fancy opening a transmission-related can of worms but could suggest the symptom is a precursor to codes appearing if you have the more detailed scanner/software available. Do you think there is any gear during happening with the revs oscillation or just engine behaviour as Dave was suggesting?

 

Update 

 

The car got a lot worse. Only drove between mechanics

She's been with 3 mechanics

2 don't have a clue and the other just says gearbox without driving it(seems an easy response) 

I went to start it the other morning and the battery was dead! I jumped the battery and the car was the worst it's ever been! It was stalling when coming to a quick stop. It then fired up limited transmission or Somthing. This went away after restarting 

I checked my battery and the green indicator seemed to be dull.

 

I got loan of a replacement battery(not new). 110 80a

Started the car but when it was put in reverse(Whilst parked) . It just started thumping and jolting the whole car violently! 5 mins previous it wasn't doing this with the original. 

Putting it into drive(whilst parked) done the same but stalled it. Won't rev over 3rpm

I'm going to change the battery back to the original this morning to see if the behaviour changes. 

What the hell? 

Ok, 

 

Put the previous battery back in. Car doesn't constantly jolt/jump when in gear. When putting into Gear the rear really dips down. But its just feel like it wants to drive Off. 

Got speaking with the transmission specialist who replaced the gearbox before I bought the car. He said there was a lot of electrical issues came up during the replacement so he's going to look into it for me. 

25 minutes ago, Nialld said:

Got speaking with the transmission specialist who replaced the gearbox before I bought the car. He said there was a lot of electrical issues came up during the replacement so he's going to look into it for me. 

Keep us posted, literally! Hope it gets sorted, and if you do get it done, it's always handy for the next guy doing a search for a similar fault...

Using this post I just made to another topic, exactly the same issue happened to me, it is not electrical, nor is it in the PCM.  I think your gearbox is subject to the same failure all us powershift owners will face sooner or later. The torque convertor which acts as a dual mass fly wheel in the housing, has springs and plastic retainer clips in it, which are not fit for purpose. The plastic shatters, pollutes the gearbox as it's chewed up through the gears and eventually will clog up the mechatronic and valve body. If you are technically inclined, you could remove the gearbox from the car and tear it apart, replace the plastics, and very (very) thoroughly clean the mechatronic and the valvebody, as well as replacing the internal filter. The parts and oil will set you back a few hundreds. Having this done by a pro will cost you 2500 to 3500. 

I have been through this in May and had the luck that the car was still under some form of warranty, so I did not have to pay the full price, also the company that overhauled my gearbox was very helpful and understanding, so they made their best effort and had a way to source extra hardened/stronger plastic clips. 

I am also part of an FB group for this specific gearbox and all of their issues, the Getrag MP6 DCT450/470 box. If you want I can share some links pertaining to this issue, mostly YouTube vids.

Replacing the gearbox does NOT fix this issue, unless it is a brand new one, installed with full warranty. Buying a used gearbox will not help you in any way, as most of these gearboxes will have the same issue, and it is a matter of time before the mechatronic and valvebody will get contaminated. 

In this specific case, the TCM is getting mixed signals about whether to engage the clutch or not, probably caused by one or more sensors that are contaminated as well. Sorry to be the bearer of bad news, but the good news is; you're not alone and if you want, a number of people can help you out with solid advice, technical knowledge and loads of experience to help you out.