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Home >> Mazda >> 2021 >> CX-9 Signature >> Repair and Diagnosis >> External Pages >> Different car >> Section 22 (On-Board Diagnostic - Two-Step Deployment Control System) >> DTC U0001-88; U0155-00; Unit Communication Error System Malfunction >> Notes
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DTC U0001-88; U0155-00; Unit Communication Error System Malfunction: Notes

WARNING: This page is about a different car, the 2017 Mazda CX-9. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location
  • U0001:88: Unit communication error (HS-CAN)
  • U0155:00: Communication error with instrument cluster
Detection condition U0001:88
  • SAS control module detects a CAN communication line (HS-CAN) error. U0155:00
  • SAS control module could not receive CAN signal from the instrument cluster for 5 s or more.
Fail-safe Not applicable
Possible cause
  • Malfunction in CAN bus communication line
  • Malfunction in CAN line between the SAS control module and instrument cluster
System wiring diagram Not applicable