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BMW 3-Series (E90 E92) Forum
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335i single turbo transmission issue
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10-12-2024, 06:41 PM | #1 |
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335i single turbo transmission issue
Im at my wits end with this car. I replaced the entire transmission and the shifter, as well as the shifter cable. Whenever i put the car into drive it engages M2. When i put it into sport mode it will show the D/S but will not leave 2nd gear and doesnt shift. I replaced both paddles as well. The car has a jb4 and a Custom MHD BEF for a borgwarner 6973. Im thinking i replaced all hardware then it mist be a software issue but there are no codes. But i occadionally get the transmission malfunction light on the dash so if anyone has any tips or can help i would greatly appreciate it.
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2007 E92 335i - MHD, Turbo Technics 19T's
2008 E60 535XI - JB4 2010 E92 335i - JB4, Borg Warner EFR 8374 |
10-13-2024, 06:34 AM | #2 |
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What’s the code when the transmission light comes on? Only thing I can think of is a faulty TCM. Did you at some point ever accidentally touch the pins on the TCM? They’re prone to failure from ESD.
Do you have an xHP flash? If so, is the issue still there when you completely uninstall the flash? Also, how new is your valve body? Did you swap in your old valve body to the new transmission? I’m assuming we’re talking about a 6HP21 Last edited by konstat; 10-13-2024 at 06:35 AM.. |
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SlowE92114.50 |
10-13-2024, 07:27 PM | #3 | |
First Lieutenant
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Quote:
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2007 E92 335i - MHD, Turbo Technics 19T's
2008 E60 535XI - JB4 2010 E92 335i - JB4, Borg Warner EFR 8374 |
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