[AW750Li]

I was on the highway the other day and I was in manual mode (6AT) and I went to switch lanes and I went from 6th to 4th gear and my rpms just shot up and it went into transmission malfunction mode. The car was stuck in 2nd gear on the highway and I was trying to shift it but it wasn't doing anything. I pulled over and turned my car on and off and it went away. Did this happen to any of you guys and what should I do? Im still under warranty.

If it matters my mods are: bms dci, cobb stage 2 sport, vk downpipes

[mikolo-n54]

How many miles? You could try swapping out the tranny fluid and filter and see if it does it again. If not your tranny is prob on the way out...

[Jeff@TopGearSolutions]

Originally Posted by mikolo-n54

How many miles? You could try swapping out the tranny fluid and filter and see if it does it again. If not your tranny is prob on the way out...

[WedgePerformance]

My transmission had a leak around the MCM connector and lost a lot of oil. I fixed it before it became an issue. Hopefully yours isn't leaking and or low on oil. Are you also running the Alpina flash?

[EuroKar]

Originally Posted by AW750Li

I was on the highway the other day and I was in manual mode (6AT) and I went to switch lanes and I went from 6th to 4th gear and my rpms just shot up and it went into transmission malfunction mode. The car was stuck in 2nd gear on the highway and I was trying to shift it but it wasn't doing anything. I pulled over and turned my car on and off and it went away. Did this happen to any of you guys and what should I do? Im still under warranty.

If it matters my mods are: bms dci, cobb stage 2 sport, vk downpipes

You are still under warranty ? Then go to the dealer.
All you are going to get are assumptions from anyone on the forum.
Since you were able to continue normal driving off of 1 key cycle then its possible there are no codes stored.
There are a few TSB's regarding software updates for random shift issues.

[AW750Li]

Originally Posted by EuroKar

You are still under warranty ? Then go to the dealer.
All you are going to get are assumptions from anyone on the forum.
Since you were able to continue normal driving off of 1 key cycle then its possible there are no codes stored.
There are a few TSB's regarding software updates for random shift issues.

I don't know if i should bring it in with the downpipes. Do you think having downpipes would be a problem for something that has to do with the transmission?

[EuroKar]

Originally Posted by AW750Li

I don't know if i should bring it in with the downpipes. Do you think having downpipes would be a problem for something that has to do with the transmission?

That is the tough part to answer. Ive seen some dealerships throwing the rule book around.
I personally know some service advisors that will perform the diagnostic on any modified BMW and as long as the "aftermarket" part is not the root cause of the drivability issue then it is no issue.
Most dealerships do not do this but I know a few in Southern California that will.
Good luck man.

[83k]

been experiencing that same problem for some time now.. gears would slip from 5-6 gear consecutively, so i drove on steptronic and was well for the next couple months. now i have about a 30-40% chance of it occurring so i'm on the market to get a new tranny. shop diagnosed the problem and told me i needed to rebuild the transmission.

[WedgePerformance]

Originally Posted by 83k

been experiencing that same problem for some time now.. gears would slip from 5-6 gear consecutively, so i drove on steptronic and was well for the next couple months. now i have about a 30-40% chance of it occurring so i'm on the market to get a new tranny. shop diagnosed the problem and told me i needed to rebuild the transmission.

get a quote then go out to CAR-PART dot COM and look for a low mile salvaged transmission. For what it would cost for the rebuild kit, you can probably get a good used trans that can be shipped to your local shop. It's plug n play at that point. Just make sure you flash the trans after its installed. If you need help with that, let me know. You just need a $30 cable and some software which I can help you with.

[AW750Li]

Originally Posted by EuroKar

That is the tough part to answer. Ive seen some dealerships throwing the rule book around.
I personally know some service advisors that will perform the diagnostic on any modified BMW and as long as the "aftermarket" part is not the root cause of the drivability issue then it is no issue.
Most dealerships do not do this but I know a few in Southern California that will.
Good luck man.

Yeah I spoke to my advisor and I told him about my downpipes and he was saying that i should get them removed because it can cause back pressure to the engine and it can lead to problems in the transmission...so they would try to void my warranty. My cars been slipping from 4th to the 5th gear under hard acceleration for a while now (before downpipes) so I think my transmission is going. Im just going to wait for it to happen again then get the DP's removed and take it in.

[mikolo-n54]

Originally Posted by AW750Li

Yeah I spoke to my advisor and I told him about my downpipes and he was saying that i should get them removed because it can cause back pressure to the engine and it can lead to problems in the transmission...so they would try to void my warranty. My cars been slipping from 4th to the 5th gear under hard acceleration for a while now (before downpipes) so I think my transmission is going. Im just going to wait for it to happen again then get the DP's removed and take it in.

Lol at techs.. pretty sure dp's remove back pressure and have absolutely nothing to do with the transmission. Find yourself a new tech. Its the extra boost that puts the wear and tear on the drive train.

All depends on your SA, mine could care less about the mods i'm running except when making a warranty repair like the turbos(which I just had replaced) which is documented and the downpipes need to come off before the work.

[EuroKar]

Half of the techs at any dealership don't know shit about cars anyways. They just do what the factory computer and the shop foreman tell them to do.
If down pipes were damaging transmissions then ALL of us would be in trouble

[WedgePerformance]

Originally Posted by AW750Li

Yeah I spoke to my advisor and I told him about my downpipes and he was saying that i should get them removed because it can cause back pressure to the engine and it can lead to problems in the transmission...so they would try to void my warranty. My cars been slipping from 4th to the 5th gear under hard acceleration for a while now (before downpipes) so I think my transmission is going. Im just going to wait for it to happen again then get the DP's removed and take it in.

They can point the finger at just about anything that might increase the power over factory limits and say it was due to modifications that caused the failure. Most dealerships won't because they wouldn't make any money if they rejected, not to mention the law suite that would follow if they did this to everyone. I think the biggest issue is BMWNA and their stance on modifications and certifications they make the dealerships go through for approvals. If they certify it was free of modifications and a regional inspector comes to look at the car prior to approval of warranty, they can get into trouble for no disclosing the car had performance modifications. Really depends on the dealership, service manager, and tech who is working on the car. The SA really doesn't have mush say once its in the shop.

So take the 2 hours that it takes to put the DPs back on and then you don't have any questions issues or concerns. Just a pain in the @ because you have to put them back on after you get the trans replaced. haha

[Eleventeen]

Originally Posted by EuroKar

Half of the techs at any dealership don't know shit about cars anyways. They just do what the factory computer and the shop foreman tell them to do.
If down pipes were damaging transmissions then ALL of us would be in trouble

From the stories I read on different forums, it seems like a lot of automotive techs are an embarrassment to the trade. I'm not a mechanic, but I am confident I know more than some of these guys just by the stupid stuff they tell people LOL. In general, think the guys at the indy shops know their stuff, though.

[EuroKar]

Originally Posted by Eleventeen

From the stories I read on different forums, it seems like a lot of automotive techs are an embarrassment to the trade. I'm not a mechanic, but I am confident I know more than some of these guys just by the stupid stuff they tell people LOL. In general, think the guys at the indy shops know their stuff, though.

Yeah I for sure agree with you about the fact that independent specialty shops are the way to go.
Obviously, once your car is out of warranty.
I use a german specialty shop. They have all the factory tools and diagnostic equipment, ASE certified techs, Dinan authorized dealer (which is hard for any independent shop to obtain), and that comfortable feeling that you are being taken care of correctly and not just another number.

But back to the nature of this post... sucks man. Put your cats back in and hit up the dealer.
Lets us know what happens !

[ajsalida]

OP, if this were my car I'd hold off on doing anything major. See if the problem repeats or other things start up/worsen. In the mean time see if you can check fluid level, visually inspect for leaks etc.

The other thing is, not sure this would even be relevant, it is known the shifter wires get messed up under the console. This is just a guess but I do not see how you suddenly go from 4th to 2nd unless some error in shifting command took place.