Quote:
Originally Posted by hatcherpass
Thats sort of what I was wondering, if in anyway a wiring issue or even a momentary brain fart on the JB4 could cause the transmission to malfunction seeing as it is tied into the CANBUS. Like I had mentioned, the car seemed to go into a sort of limp mode where it was stuck in about 3rd gear.
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I don't think that's true either. The JB4 is hard coded...there are no "brain farts".
More to the point though, the CANBUS, as far as I understand, is ONLY used for user-interface purposes via the dash, and thus, to allow a user to set JB4 parameters. The JB4 functionality does not rely on it at all. Hence, you can set the JB4 to your liking, and skip the CANBUS connection all together.
If your connections are good, including the ground, and the JB4 works normally 99% of the time, honestly, start to look elsewhere for an issue.
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'02 S54 M3 (500/500 GC/Koni)
'08 N54 135 (JB4, DCI, BMW PS/Bilstein B6s, H&R M3 FSB, Strongflex FCABs)
'14 N55 X1 (JB4, BMS DP, BMS Intake, Alpina TCU reflash, H&R Sports, Bilstein B6s, E93 M3 RSB, Strongflex FCABs, baby seat)
'08 N54 535xi touring (Bilstein B6s, Downpipes, MHD tune, baby seat)