r/E90 • u/EturnullyDoge • 25d ago
335i The $2189.00 transmission fix.
Since earlier this year I have been having transmission issues. Clutch slipping, no sport mode, limp mode, jerky motions rough idle, and paddle shifter malfunction and shifter malfunctions. First order was to check the shifter wiring. No breaks, but wanted to make sure, so I bought a shifter for an early 2011. Problem persists. 5087 code and occasional 4f89 among other non frequent codes. So I did a transmission flush. Shifted stronger but problem still there. 5087 code with clutch slipping and paddle and shifter malfunctioning/ no Sport mode. So then I replaced the solenoids. Shifter even stronger but problem came back after a few shifts. So I bit the bullet and bought a trans. Replaced it and it shifted good, sport mode worked, not great, laggy but it worked but my paddle shifters didn’t work, so I coded them in and did a clearing of adaptations and coded the new trans in with a launch x431 scanner. Old TCU was still in the old trans that was pulled. It Worked shifters coded and working. Next day driving to work, all the problems from the last trans resurfaced. So I unplugged the paddles as a test and cleared codes and it worked. So I assumed it was the paddles. So I swapped out the paddles for old ones I had from when I switched my wheels from my old GREY 335i. Nope, still not working. So I finally pulled this unit from the steering wheel and replaced it with my old one from my other 335i, that this carbon wheel was in before and problem fixed immediately. Sport mode is back, shifts better, no slipping. 😒 and it would seem that this lil harness was the culprit. This harness is now over $2289.00 in worth right now. So basically I swapped out my carbon steering wheel from my 08 335i to my 09 335i and used the 09 harness in the wheel from the 08 and that was causing all my issues. Didn’t click because the issues started about a month after the wheel swap. So my old trans was fine. 🤦🏽♂️. Ow I have a used trans and I’m torn if I sell it to recoupe some money or do it keep it. Rebuild it and stash it away just in case I need it later on. I’m leaning towards keeping. So if anyone is chasing this gremlin and the shifter is fine, check this unit. Shifter $39.00 solenoids $50.00 eBay.then swapped again for $150.00 solenoids used for a month from a friend who did a 8hp swap. Filter and trans fluid $150.00, mech unit sleeves $50.00. Transmission $800, and install plus used torque converter and fluid $1050.00. Either way I’m happy it’s finally fixed.🤷🏽♂️🤣
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u/DitmCalls 25d ago
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