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First start, not going into gear?

Posted: 29 Mar 2026, 01:48
by Project.Darkside
Project is an E90 BMW with an 8HP45 transmission and I am using an F3x electronic shifter. I wasnt getting any error codes at first, but I also couldn't put it into neutral or drive. The shifter is lit up as expected but the TCU is essentially ignoring any inputs. I am using the E9x wiring harness and flashed the 8HP45 base map, changed the Can1 Selector to 32 (for the F series electronic shifter) and Can 2 CAR to 30 since it had a 6HP and is an E9x body. After fiddling with it even more, I got even more errors on the dash regarding the transmission and selector improbable codes as well as a code 20 intermittently on the Turbolamik screen. Help!

Re: First start, not going into gear?

Posted: 29 Mar 2026, 17:00
by Project.Darkside
I had a brief success by removing and reseating the connector on the transmission. That worked, until it didn't anymore at all. 🥺

Needless to say, that was short lived. The input shaft speed sensor started reading and all was good, until it stopped working again and nothing helped. I have pulled the mechatronics out to investigate further.