2015 BMW 335i — fuel trims are positive at idle and improve with RPM

If it were in my driveway, get a real battery/charging test on the 2015 BMW 335i, not just resting voltage, before blaming a module. Save the big job until that test fails. Had a similar mess a couple years ago and that's what finally sorted it. I'd sleep better after that step, even if it finds nothing. Parking it somewhere I can hear it better next time.

Ask what changed right before it started. Write temp, speed, and in-gear vs coast when the 2015 BMW 335i does it — then decide on parts. You'll know quickly if you're on the wrong tree. Was this after sitting overnight? No warning lights, which is why I'm documenting it.