DTC U0028:87 [Advanced Keyless Entry And Push Button Start System]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

DETECTION CONDITION	No communication with BCM
POSSIBLE CAUSE	Connector or terminal malfunction Short to ground in wiring harness between BCM terminal 6J and keyless control module terminal 2F Open circuit in wiring harness between BCM terminal 6J and keyless control module terminal 2F BCM malfunction Keyless control module malfunction
Courtesy of MAZDA MOTORS CORP.