LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2016 >> CX-9 Signature >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic (4 Of 4) >> DTC U0305-00: Radar Unit Error >> Notes
April 5, 2026: LEMON Manuals is launched! Read the announcement.

DTC U0305-00: Radar Unit Error: Notes

DTC U0305:00 Radar unit error
Detection Condition 
  • When any of the following conditions is met:
    • CAN communication line malfunction between radar unit and PCM
    • Radar unit internal malfunction

Diagnostic Support Note 

  • This is a continuous monitor (other).
  • The check engine light does not illuminate.
  • FREEZE FRAME DATA is not available.
  • Snapshot data is available.
  • DTC is stored in the PCM memory.
Fail-Safe Function  Not applicable
Possible Cause 
  • CAN drive error (instrument cluster or PCM)
  • CAN communication line malfunction between radar unit and PCM
    • Radar unit terminal D-PCM terminal 2AK
    • Radar unit terminal C-PCM terminal 2AL
  • Radar unit connector or terminals malfunction
  • PCM connector or terminals malfunction
  • Radar unit malfunction
  • PCM malfunction
G10946272