DTC U2646-13: Power Liftgate (PLG) Control Module Power Supply Circuit (B1+) Malfunction (BCM) (Us): Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC U2646:13 (BCM) (US) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Power liftgate (PLG) control module power supply circuit (B1+) malfunction
Detection condition	The power liftgate (PLG) control module power supply circuit (B1+) voltage is lower than the standard for 3 s or more.
Fail-safe	Stops the power liftgate (PLG) system operation.
Possible cause	DTCs are stored in the PCM. Battery malfunction Generator malfunction Power liftgate (PLG) control module connector or terminal malfunction Open circuit in power liftgate (PLG) control module power supply circuit (B1+) Power liftgate (PLG) control module malfunction Body control module (BCM) malfunction
Courtesy of MAZDA MOTORS CORP.