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Home >> Mazda >> 2021 >> CX-5 Sport, FWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 9 (On-Board Diagnostic - Automatic Transaxle (GW6A-El, GW6AX-El)) >> DTC U0073-00, U0100-00, U0121-00, U0131-00, U0155-00, U0214-00: Communication Error >> Notes

DTC U0073-00, U0100-00, U0121-00, U0131-00, U0155-00, U0214-00: Communication Error: Notes

WARNING: This page is about a different variant/trim than selected.
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0073:00 CAN system communication error (HS CAN)
DETECTION CONDITION
  • Under the following condition, a communication error (HS CAN) occurs:
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits learning control.
  • Inhibits neutral idle control.
  • Inhibits AAS.
POSSIBLE CAUSE
  • CAN bus communication line malfunction (HS CAN)
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0100:00 Communication error to PCM (HS CAN)
DETECTION CONDITION
  • Under the following condition, the TCM cannot receive the signal from PCM (HS CAN):
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits learning control.
  • Inhibits neutral idle control.
  • Inhibits AAS.
POSSIBLE CAUSE
  • CAN communication line malfunction between PCM and TCM (HS CAN)
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0121:00 Communication error to DSC HU/Control Module
DETECTION CONDITION
  • Under the following condition, the TCM cannot receive the signal from DSC HU/Control Module:
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits learning control.
  • Inhibits neutral idle control.
  • Inhibits AAS.
POSSIBLE CAUSE
  • CAN communication line malfunction between TCM and DSC HU/Control Module
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0131:00 Communication error to EPS control module
DETECTION CONDITION
  • Under the following condition, the TCM cannot receive the signal from EPS control module:
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits learning control.
  • Inhibits neutral idle control.
POSSIBLE CAUSE
  • CAN communication line malfunction between TCM and EPS control module
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0155:00 Communication error to instrument cluster
DETECTION CONDITION
  • Under the following condition, the TCM cannot receive the signal from instrument cluster:
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits learning control.
  • Inhibits manual mode.
  • Inhibits neutral idle control.
POSSIBLE CAUSE
  • CAN communication line malfunction between TCM and instrument cluster
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
DTC U0073:00, U0100:00, U0121:00 DETECTION CONDITION AND POSSIBLE CAUSE

DTC U0214:00 Communication error to start stop unit
DETECTION CONDITION
  • Under the following condition, the TCM cannot receive the signal from start stop unit:
    • Battery voltage is 10 V or more.
FAIL-SAFE FUNCTION
  • Inhibits direct mode.
POSSIBLE CAUSE
  • CAN communication line malfunction between TCM and start stop unit
  • TCM malfunction
SYSTEM WIRING DIAGRAM Not applicable
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