DTC U0001-88; U0100; U0155; Can System Communication Error (HS-Can): Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION & POSSIBLE CAUSE

DTC U0001:88	CAN system communication error (HS-CAN)
DETECTION CONDITION	Malfunction in CAN bus communication line.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAN bus communication line malfunction DC-DC converter malfunction
SYSTEM WIRING DIAGRAM	Not applicable
DTC U0100:00	CAN communication: communication error to PCM
DETECTION CONDITION	Communication error between the DC-DC converter and PCM continues for 5 s or more.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAN communication line between DC-DC converter and PCM malfunction PCM malfunction DC-DC converter malfunction
SYSTEM WIRING DIAGRAM	Not applicable
DTC U0155:00	CAN communication: communication error to instrument cluster
DETECTION CONDITION	Communication error between the DC-DC converter and instrument cluster continues for 5 s or more.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	CAN communication line between DC-DC converter and instrument cluster malfunction Instrument cluster malfunction DC-DC converter malfunction
SYSTEM WIRING DIAGRAM	Not applicable