DTC U0028 87: Communication Error With Rear Body Control Module (RBCM): Notes
WARNING: This page is about a different car, the 2014 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DTC U0028:87 (START STOP UNIT) DETECTION CONDITION AND POSSIBLE CAUSES
| 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
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| Fail-safe function |
Not applicable |
| 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 1G 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
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 Courtesy of MAZDA MOTORS CORP.
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