[SlowE92]

So im having this issue with my transmission where it will not shift. Every other gear works but whenever i put it into drive it will not upshift or downshift. I have replaced the transmission/shifter/transmission harness, pretty much every hardware piece to no avail. When i was trying to vin match the transmission it gave me a hard time but eventually was successful. I have a jb4 and custom mhd bef on the car. Im at my wits end with this thing. If anyone has any insight on other steps i would be very appreciative.

[oVeRdOsE.]

is it you with an old JB4 gen4 and and unknown flash file?

chance are low, but can be related. There was many update since then, both MHD and Jb4. MHD can mess with transmission.

since this should be a item you should upgrade, I would start with that, even if not related.

- get a used Jb4 gen5, with bluetooth, flash the latest BMS firmware for ST, get all the settings to base one (you can find it on jb4tech)

- Flash MHD BMS free single turbo map, and turn off all MHD options.

Log and do your own tune.

Option 2 : manual swap, and this will enable MHD launch control

[SlowE92]

Originally Posted by oVeRdOsE.

is it you with an old JB4 gen4 and and unknown flash file?

chance are low, but can be related. There was many update since then, both MHD and Jb4. MHD can mess with transmission.

since this should be a item you should upgrade, I would start with that, even if not related.

- get a used Jb4 gen5, with bluetooth, flash the latest BMS firmware for ST, get all the settings to base one (you can find it on jb4tech)

- Flash MHD BMS free single turbo map, and turn off all MHD options.

Log and do your own tune.

Option 2 : manual swap, and this will enable MHD launch control

Yes its the old g4 board. I have the latest version of MHD currently. When i flash the car do i need to put the jb4 in a different setting? It was on bef mode when coding the new transmission. I have ordered a g5 board upgrade hoping it will help. And yeah it has a custom bef map from previous owner.

[oVeRdOsE.]

Originally Posted by SlowE92

Yes its the old g4 board. I have the latest version of MHD currently. When i flash the car do i need to put the jb4 in a different setting? It was on bef mode when coding the new transmission. I have ordered a g5 board upgrade hoping it will help. And yeah it has a custom bef map from previous owner.

if you have JB4 single turbo firmware, no need to put it in a different mode.

map 1 to 8 will act just like no MHD.

[SlowE92]

Originally Posted by oVeRdOsE.

if you have JB4 single turbo firmware, no need to put it in a different mode.

map 1 to 8 will act just like no MHD.

Which steering wheel control utilizes the stock map? It is set to 4/2 right now, i want to see if running the stock map will change anything

[oVeRdOsE.]

Originally Posted by SlowE92

Which steering wheel control utilizes the stock map? It is set to 4/2 right now, i want to see if running the stock map will change anything

not sure if 4/2 is still a thing

https://www.e90post.com/forums/showthread.php?t=799033

mine is 4/0.

The BEF is now your stock map, 0/0 (disable jb4) and 0/1 is the base map no boost control (wastegate spring). better run 0/1 for jb4 safety stuff.

[SlowE92]

Originally Posted by oVeRdOsE.

not sure if 4/2 is still a thing

https://www.e90post.com/forums/showthread.php?t=799033

mine is 4/0.

The BEF is now your stock map, 0/0 (disable jb4) and 0/1 is the base map no boost control (wastegate spring). better run 0/1 for jb4 safety stuff.

Yeah its on 0/0 and then menu 4 is on 4/2. Im thinking it has to be some type of software issue.

[oVeRdOsE.]

Originally Posted by SlowE92

Yeah its on 0/0 and then menu 4 is on 4/2. Im thinking it has to be some type of software issue.

if you are on 0/0, then jb4 is not working at all (off), and 4/2 or 4/0 wont change anything, and you rely only on the BEF flash file. Which I'm not 100% sure if the car will act correctly.


if you want to mess with the JB4, you need to 0/1 at least

[SlowE92]

Originally Posted by oVeRdOsE.

if you are on 0/0, then jb4 is not working at all (off), and 4/2 or 4/0 wont change anything, and you rely only on the BEF flash file. Which I'm not 100% sure if the car will act correctly.


if you want to mess with the JB4, you need to 0/1 at least

Im so stupid lol. Its on bef mode with the jb4 disabled. I will try and see if this fixes anything. Long shot but who knows lol.

[SlowE92]

Originally Posted by oVeRdOsE.

if you are on 0/0, then jb4 is not working at all (off), and 4/2 or 4/0 wont change anything, and you rely only on the BEF flash file. Which I'm not 100% sure if the car will act correctly.


if you want to mess with the JB4, you need to 0/1 at least

Unfortunately it did not help. I will wait for the g5 board and see if that fixes my issue. When i put the car in drive it will not upshift or down shift and when i put it into d/s it does the exact thing.

[oVeRdOsE.]

JB4 shouldn't mess with the transmission anyway.

you always can try to backup your original .bin file from BEF via MHD, and then flash the single turbo file on jb4tech.

I'm running this file, and the car is insane , even if not optimized with a ''tuner''.


did you check the auto transmission swap thread? shifting point is often related to some imput such as rpm, load, pedal position, speed etc. So a lot of electronic .

you can diagnos with inpa and/or ista. Be sure to set jb4 at 0/0 before, since it will try to connect and fail.

[BRG_N54]

Looking at your previous post on this issue, you still have not validated the fluid level in your transmission.

Please do the basics first, before you venture down the tuning rabbit hole. If it is underfilled, nothing JB4 can do to help it.

[SlowE92]

Originally Posted by BRG_N54

Looking at your previous post on this issue, you still have not validated the fluid level in your transmission.

Please do the basics first, before you venture down the tuning rabbit hole. If it is underfilled, nothing JB4 can do to help it.

Sorry, i overlooked that in my old post. When flushing the transmission i think i used something like 11-12 liters, just until all the old fluid was out. I had a friend that works on these at his shop help me out.

[SlowE92]

Originally Posted by oVeRdOsE.

JB4 shouldn't mess with the transmission anyway.

you always can try to backup your original .bin file from BEF via MHD, and then flash the single turbo file on jb4tech.

I'm running this file, and the car is insane , even if not optimized with a ''tuner''.


did you check the auto transmission swap thread? shifting point is often related to some imput such as rpm, load, pedal position, speed etc. So a lot of electronic .

you can diagnos with inpa and/or ista. Be sure to set jb4 at 0/0 before, since it will try to connect and fail.

I will try one of the off the shelf bef maps and see if that helps. So far i just flashed the stock map and the jb4 is on 0/0 but this issue still persists.

[SlowE92]

Originally Posted by BRG_N54

Looking at your previous post on this issue, you still have not validated the fluid level in your transmission.

Please do the basics first, before you venture down the tuning rabbit hole. If it is underfilled, nothing JB4 can do to help it.

I can double check here in a bit and get my car off the ground, its possible. He told me to fill til it spills.

[Brandoch]

Originally Posted by SlowE92

I can double check here in a bit and get my car off the ground, its possible. He told me to fill til it spills.

You need to get the fluid up to temp first I don't remember the specific temperature at the moment.

[oVeRdOsE.]

Originally Posted by Brandoch

You need to get the fluid up to temp first I don't remember the specific temperature at the moment.

On my ZF8 you need to fill, start the car for few min to temperature, then select all gear, then refill.

So at stop the transmission fill hole is ''overfilled''.

Annoying procedure, require to jack the car at 4 corners.

[konstat]

Originally Posted by SlowE92

Sorry, i overlooked that in my old post. When flushing the transmission i think i used something like 11-12 liters, just until all the old fluid was out. I had a friend that works on these at his shop help me out.

11-12 liters is too much if that’s true, total system is 9 liters.

When car is cold (if not wait for car to cool down), start car and then pull fill plug. Once you get up to 40 deg C there should be a small stream coming out.

Also what fluid did you use? I’ve heard issues with use of liqui moly’s fluid in the 6HP

[SlowE92]

Originally Posted by konstat

11-12 liters is too much if that’s true, total system is 9 liters.

When car is cold (if not wait for car to cool down), start car and then pull fill plug. Once you get up to 40 deg C there should be a small stream coming out.

Also what fluid did you use? I’ve heard issues with use of liqui moly’s fluid in the 6HP

I ran 11 through it to flush all the old fluid out. And i used zf fluid.

[SlowE92]

Originally Posted by oVeRdOsE.

On my ZF8 you need to fill, start the car for few min to temperature, then select all gear, then refill.

So at stop the transmission fill hole is ''overfilled''.

Annoying procedure, require to jack the car at 4 corners.

I checked the fluid with the car warm and fluid was coming out.

[konstat]

Originally Posted by SlowE92

I checked the fluid with the car warm and fluid was coming out.

Are there any codes that you can provide using protool (assuming you ended up buying it) or any other car functions that are also problematic.

Guessing at what it could be at this point but I know if FRM is faulty it causes issues in other modules. From your other thread and this one it seems like you’ve changed everything that is relevant to the transmission itself so unless codes tell you something maybe it’s time to look for the problem elsewhere in the car?