CA941B is a fault stored in your BMW's memory (an ISTA fault code, not a standard OBD-II P-code).
What it means: Message timeout in the vehicle-information network (BMW infrastructure): a module didn't receive expected vehicle-info data in time — usually the head unit (HU-H), surround-view camera or driver-assist. Symptoms: iDrive glitches, 360° cameras not loading, assist features briefly unavailable. Most often a software hiccup or a voltage drop (weak battery).
