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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 U0447-86: Error Signal Received From BCM [Start Stop Unit] >> Notes

DTC U0447-86: Error Signal Received From BCM [Start Stop Unit]: Notes

DTC U0447:86 (START STOP UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

Description Error signal received from BCM
Detection condition
  • Start stop unit receives the error signals from the BCM for 5 s or more with the ignition switched ON (engine off or on).
Fail-safe
  • Sets to default signal.
Possible cause
  • DTCs are stored in the BCM.
  • BCM malfunction
  • Start stop unit malfunction
System wiring diagram Not applicable