DCT stalling when engaging drive or reverse

[N0MAD]

So this is what’s happening on my
2012 e92 m3 DCT
67k miles

Car turns on fine
Push gear selector to drive or reverse and cars lurches forward and stalls out

Exactly like dumping the clutch in a manual and stalling

Leave the car off for a couple minutes for it to completely shut off

Turn it back on and it’s fine

plugged in the scanner and no codes were stored

Car has gts trans tune but I’ve had it on there for 2 months no issues just happened the other day

If you have an idea of what it may be let me know!

The only thing I found online that was remotely similar ended up being a ground wire from the engine to the oil pan?

But I have no idea

Please help!

[N0MAD]

Bump did a transmission service and the car ran fine for a month or two and now it did it again push car to drive car lurches forward stalls

Turn on

Push car into reverse car lurches back and stalls

Any ideas?

[DrFerry]

Originally Posted by N0MAD

Bump did a transmission service and the car ran fine for a month or two and now it did it again push car to drive car lurches forward stalls. Turn on. Push car into reverse car lurches back and stalls. Any ideas?

The DCT fluid level maybe quite low. Get the car up on the lift with the car warm and up to normal operating temperature. Check the DCT fluid level using the established BMW procedure. Search the forums for the DCT fluid check and fill procedure. It can take quite sometime to get the DCT properly filled with the engine idling (if I recall correctly). The DCT clutches are wet clutches inside a basket and depend upon the correct DCT fluid level for smooth operation. The DCT maybe leaking fluid from the mechatronics side cover, or the loom "O" ring on the top of the gearbox, or the pan gasket corner (or all of the above). Over time enough fluid will leak out that operation becomes clunky and or the DCT will overheat. Try all of the above first before going back to OEM DCT software.

[omgzirra_exe]

Originally Posted by DrFerry

The DCT fluid level maybe quite low. Get the car up on the lift with the car warm and up to normal operating temperature. Check the DCT fluid level using the established BMW procedure. Search the forums for the DCT fluid check and fill procedure. It can take quite sometime to get the DCT properly filled with the engine idling (if I recall correctly). The DCT clutches are wet clutches inside a basket and depend upon the correct DCT fluid level for smooth operation. The DCT maybe leaking fluid from the mechatronics side cover, or the loom "O" ring on the top of the gearbox, or the pan gasket corner (or all of the above). Over time enough fluid will leak out that operation becomes clunky and or the DCT will overheat. Try all of the above first before going back to OEM DCT software.

correct, your DCT fluid might not be filled to its max capacity.

alternatively, use ISTA to do a clutch pack relearn.

[N0MAD]

Update, had a faulty trans pan from fall line Motorsport they sent over another one.

transmission service completed again no visible leaks and car is still experiencing same symptoms

No codes either my only option is to flash the ECU back to stock as well as the dct and see if that fixed it

If anyone has any other ideas I’m all ears

Thanks!

[omgzirra_exe]

Originally Posted by N0MAD

Update, had a faulty trans pan from fall line Motorsport they sent over another one.

transmission service completed again no visible leaks and car is still experiencing same symptoms

No codes either my only option is to flash the ECU back to stock as well as the dct and see if that fixed it

If anyone has any other ideas I’m all ears

Thanks!

and you are certain they did the proper DCT fill service?

[N0MAD]

Yes proper dct fill procedure was done

[omgzirra_exe]

Originally Posted by N0MAD

Yes proper dct fill procedure was done

clutch pack re-learn? Dct adaptation reset?

did you check your engine grounding cable? battery swap?

bringing the last 2 up, because a friend experienced DCT doing the same thing at the track, and we ended up charging his battery and it resolved everything.

make sure it's running around 13V..

you would also have a lot of warnings if your clutch packs were slipping as well.. so we can somewhat rule that out.

alternatively.. there is 2 items in the DCT that does need to be serviced IMO.

the low pressure pump and the jet pump...

[N0MAD]

Originally Posted by omgzirra_exe

clutch pack re-learn? Dct adaptation reset?

did you check your engine grounding cable? battery swap?

bringing the last 2 up, because a friend experienced DCT doing the same thing at the track, and we ended up charging his battery and it resolved everything.

make sure it's running around 13V..

you would also have a lot of warnings if your clutch packs were slipping as well.. so we can somewhat rule that out.

alternatively.. there is 2 items in the DCT that does need to be serviced IMO.

the low pressure pump and the jet pump...

Relearn and adaptation both done I did get a new dct transmission fluid pump installed as well

I will check the batter alternator and grounding cable as I feel as if it has to be electrical or software related as It happens very scarcely

When it does happen i turn the car back on and off again and wait until I hear these electrical clicking sounds by the dash as if the car is completely going to sleep as soon as the car does that I turn it back on and it goes into gear and drives fine every single time

[omgzirra_exe]

Originally Posted by N0MAD

Relearn and adaptation both done I did get a new dct transmission fluid pump installed as well

I will check the batter alternator and grounding cable as I feel as if it has to be electrical or software related as It happens very scarcely

When it does happen i turn the car back on and off again and wait until I hear these electrical clicking sounds by the dash as if the car is completely going to sleep as soon as the car does that I turn it back on and it goes into gear and drives fine every single time

yeah, wouldnt hurt to check the voltage regulator as well on the alternator.

[N0MAD]

I’ll go ahead and do that too thanks for the help man I’ll report back when I have more info

[N0MAD]

Hey guys so I reflashed the dct tune and everything seemed to be good to go for a couple months then the car stalls again today this time I did get a code but no check engine light

I attached the image of the code any ideas?

[boxeeh]

Originally Posted by N0MAD

Hey guys so I reflashed the dct tune and everything seemed to be good to go for a couple months then the car stalls again today this time I did get a code but no check engine light

I attached the image of the code any ideas?

N0MAD did you ever figure out the cause of your issues?

I experienced the same exact situation last night. 41k miles on my car, fully stock, recently had RB's done 250ish miles ago. Stopped for gas, filled up, and when I went to leave the car was very slow to move. Pressed the gas pedal and it took the car about 2-3 seconds to register that input and slowly start moving, then the engine dies when I hit around 1.3k rpms... pretty much felt like how a manual car would stall out. Started the car again, put it in reverse to back out, then put it into 1st gear and same thing happens - engine dies. Let the car sit for a minute before moving again and did not experience any issues after that.

[DrFerry]

Originally Posted by boxeeh

N0MAD did you ever figure out the cause of your issues? I experienced the same exact situation last night. 41k miles on my car, fully stock, recently had RB's done 250ish miles ago. Stopped for gas, filled up, and when I went to leave the car was very slow to move. Pressed the gas pedal and it took the car about 2-3 seconds to register that input and slowly start moving, then the engine dies when I hit around 1.3k rpms... pretty much felt like how a manual car would stall out. Started the car again, put it in reverse to back out, then put it into 1st gear and same thing happens - engine dies. Let the car sit for a minute before moving again and did not experience any issues after that.

Has your car ever had the fuel tank breather valve ever replaced? Stalling after fuel tank fill-ups is a known issue when the breather valve fails. Search the forums for more info if needed.
.

[N0MAD]

So I sold the car but the new owner said that he took the dct tune off and the car has been good since

[boxeeh]

Originally Posted by DrFerry

Has your car ever had the fuel tank breather valve ever replaced? Stalling after fuel tank fill-ups is a known issue when the breather valve fails. Search the forums for more info if needed.
.

Never been replaced to my knowledge. Looks like the issue I described is similar to what people who replaced their fuel tank breather valve have said. Since this is the first time this has happened in the ~2k miles I've owned the car, I'll keep an eye on this to see if it happens again ... Appreciate the pointer

Originally Posted by N0MAD

So I sold the car but the new owner said that he took the dct tune off and the car has been good since

Ah gotcha. Appreciate the reply