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      03-28-2020, 12:41 AM   #1
iEatSand
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Hard shifts 3rd to 4th, trans and DSC malfunction. Engine code P17E8

Have been having some weird/hard shifts from 3rd to 4th gear. Auto 2008 135i. Everygear is buttery smooth besides that one. When I shift from 3rd to 4th and low rpms/not giving it gas it shifts fine. When I floor it and go WOT shifting 3rd to 4th it's fine. It has trouble shifting around 3-5k RPMS if I'm not flooring it, or coasting. I'll shift to fourth, it will try and engage, then kick me down into third(but still say it's in 4th). If I don't downshift back into third when it happens it throws a transmission malfunction.

I've been reading around about this issue and that it has happened with other models like 545i's, but haven't found a thread about it happening on a 135i/335i. The trans isn't slipping at all. I could do a fluid change but I'm curious if there's a vacuum line going to the trans or a solenoid that has to be replaced? I know it's a mechatronic ZF trans like my old e55 amg. Am I able to rebuild it with the mechatronic solenoids??

I don't want to throw money at trying to fix the problem when it could end up just needing a new transmission. I've been playing around with the idea of getting a 6mt parts car for a swap.
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      03-28-2020, 08:53 AM   #2
iminhell1
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Look into the 'broken shifter wiring' first.
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      03-28-2020, 01:50 PM   #3
iEatSand
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Quote:
Originally Posted by iminhell1 View Post
Look into the 'broken shifter wiring' first.
I did do that, two of the wires were detached. The car wasn't going into M/Sport mode. I connected the two wires again and it shifted way better, however the CEL wasn't on until after I finished doing it. Take into account it didnt come on right away, maybe 5 hours after driving.

The other wires looked like they were starting to rip apart so I wrapped them with electrical tape. I might dig back into the shifter wiring and just rewire them all together in hopes that one of them was getting a bad connection.
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      03-28-2020, 02:44 PM   #4
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I had the wire problem, but it shifted normal in drive or m mode, the wires being damage may solve one thing, but the code & hard shifts may be another.
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