DTC U0447-86: Error Signal Received From BCM: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

Description	Error signal received from BCM
Detection condition	Start stop unit receives the error signals from the BCM for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe	Sets to default signal.
Possible cause	DTCs are stored in the BCM. BCM malfunction Start stop unit malfunction
System wiring diagram	Not applicable