Quote:
Originally Posted by KJ4
Purchased my '13 F30 N55 M-sport just before the pandemic. Went into limp mode (no CEL) on a few occasions usually after driving for an hour and trying to accelerate on the highway. This past week I have experienced the drivetrain malfunction warning with the following fault codes via BM3: 1A2108 & 120308. Going to have the fan replaced next week so hopefully the issues are resolved for FC 1A2108. As for FC 120308; between pressure converter, vacuum leak, boost solenoid, diverter valve or wastegate, hopefully my mechanic can pinpoint the exact cause.
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Also bumping - me and you are twins! Did you do your fan upgrade to the newer 850W yet? Just picked up a 2013 335i M-Sport and sorted out 120308 - my problem was with a boost solenoid and is now replaced but 1A2108 is a persisting one for me. Has anyone in recent times had experience with doing either of the 850W fan and/or the software flash? What have everyones courses of action been here out of warranty etc.