DTC U0028-87: Communication Error With Rear Body Control Module (RBCM) [Start Stop Unit]: Notes

DTC U0028:87 (START STOP UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Communication error with rear body control module (RBCM)
Detection condition	Start stop unit detects the communication error with rear body control module (RBCM) 10 times continuously.
Fail-safe	Performs control with the driver's side door and liftgate open.
Possible cause	Rear body control module (RBCM) connector or terminal malfunction Start stop unit connector or terminal malfunction Short to ground in wiring harness between start stop unit terminal 1Q and rear body control module (RBCM) terminal 3B Open circuit in wiring harness between start stop unit terminal 1Q and rear body control module (RBCM) terminal 3B Rear body control module (RBCM) malfunction Start stop unit malfunction
Courtesy of MAZDA MOTORS CORP.