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      08-06-2022, 11:49 AM   #1
sok
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N54 6AT trouble shifting into 4th gear when NOT on throttle

Recently my car sometimes seems to have issues shifting into 4th but only when I'm not on throttle, sometimes the revs would drop and its on neutral for a good second before jerking and going into 4th and sometimes it wouldn't go into 4th at all and I have to up or downshift to get it into gear again. When I do WOT or just light throttle it would shift just fine or jerks just a little into 4th and downshifting is all good. And it seems to always shift fine on D or DS, so it only happens on M mode shifting from 3rd to 4th. One time it didn't go into 4th and kept trying till it failed and dropped to D with a transmission malfunction error which never happened before.

I've replaced the tranny fluid before but don't really know what else I can do, any advice?
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      08-06-2022, 04:58 PM   #2
1and1
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'09 135i  [10.00]
Hi, Welcome to 1Addicts!

Sorry to hear your '08 auto tranny is causing problems. How many miles on it, and have you done any maintenance on the trans? Fluid/filter change? Solenoids replaced?

Any other mods to be aware of? XHP trans flash or anything?

Any maintenance history?

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135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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      08-06-2022, 06:49 PM   #3
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1and1 I replaced the fluid and filter, no other transmission maintenance. I didn't flash the transmission but I'm not sure if the previous owner did. No maintenance history, BMW of Seattle refused to give it to me
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      08-06-2022, 09:46 PM   #4
1and1
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'09 135i  [10.00]
Geez, I'm surprised they wouldn't share the service history... Some dealers won't, but it's sad because they can remove previous owners details before giving it to you- My dealer did...

How many miles on your trans again?
I'm about 114,500 myself currently, running a stage 3 xhp trans flash

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135i - E82.N54 2009 BSM - MHD / xHP / DCI, PR CP & 7.5" Race IC / N55 mid & Borla
. . WL RSFI, Koni, Eibach & Dinan CP's, M3 CA's / EBC Red's & Firehawk 500's
X1 - E84.N20 2013 MGM - JB4 - The Wife's, now with new turbo & ewg
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      08-06-2022, 10:56 PM   #5
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1and1 118k on the car
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      08-14-2022, 09:50 PM   #6
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I'm at 106k…
And my first gear is probably shot…
Same boat as you in 4th gear…
Once I loaded xHP, my fourth gear problems went away…
But that's when my first gear problems began(go figure)…

My mechanic said I need a trans fluid change and filter etc…
Never done it, so maybe it will help…
Working on installing new turbos…
And I bought an aftermarket warranty for a little peace of mind in regards to my trans…

I would take your car to a dealer or independent and get a professional opinion…
Like I said, I had the same fourth gear issues…
But they went away with the xHP tune…

I'm thinking that my trans is on its way out…
And I will prolong its days best I can with maintenance…

Maybe you should start planning to!
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