Auto transmission
 

I have a 2004 E53 4.4 v8 auto I had the trans updated a computer download to the latest version ever since then tha trans is going great except when I now stop completely it wants to jerk forward mechanics says he will put it back to whee it was in the first place I have also noticed that my fuel consumption has increased as well any thoughts please

Sounds like the joys of the transfer case motor... not a big deal unless you have a bad classification resistor and getting the CORRECT replacement was a painful slow process for me, but maybe in your area it won't be bad.

Sent from my SM-A730F using Tapatalk

The jerk forward (2-1 slam) is not uncommon and has a few causes (none are related to the transfer case motor, btw).

Were the trans adapatations reset when the software was updated? (I'm guessing yes). It may take a few driving cycles for the adaptations to set back to values that work in youvr trans.

Also, many 2-1 slam sysmptoms are fixed by replacing the internal seals (bridge seal and jump seals) inside the trans. And sometimes it takes some valve body work to sort (replacing solenoids etc.).

I've had mine jerk forward when activating the transfer case motor (in park) using my Foxwell NT-510 and after replacing the gear it's never done it again. Not sure why then...

Sent from my SM-A730F using Tapatalk

Well, there are some weird software interactions between the trans and the transfer case - maybe that was the cause in your case?

The ZF 6HP26 is used in many cars that dont have all-wheel drive (so no transfer case) and the 2-1 slam is an issue in these cars too...

I hadn't thought about that, plus I ended up with a nuked classification resistor about the same time. So.... that could have been more of the issue.

Sent from my SM-A730F using Tapatalk