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Home >> Mazda >> 2023 >> MX-5 Miata Club >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> On-Board Diagnostic - Start Stop Unit >> DTC U0028-87: Communication Error With BCM [Start Stop Unit] >> Notes

DTC U0028-87: Communication Error With BCM [Start Stop Unit]: Notes

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

Description Communication error with BCM
Detection condition
  • Start stop unit detects the communication error with BCM 10 times continuously.
Fail-safe
  • Performs control with the driver's side door and trunk open.
Possible cause
  • BCM connector or terminal malfunction
  • Start stop unit connector or terminal malfunction
  • Short to ground in wiring harness between start stop unit terminal 1Q and BCM terminal 2J
  • Open circuit in wiring harness between start stop unit terminal 1Q and BCM terminal 2J
  • BCM malfunction
  • Start stop unit malfunction
G15747540Courtesy of MAZDA MOTORS CORP.