DTC U0401-68: Signal Error From Pcm: Notes

WARNING: This page is about a different car, the 2016 Mazda CX-3. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0401:68	Signal error from PCM
DETECTION CONDITION	Correct data cannot be received from PCM.
FAIL-SAFE FUNCTION	Refer to "FAIL-SAFE FUNCTION TABLE ". (Refer to DTC TABLE [AWD CONTROL MODULE] .)
POSSIBLE CAUSE	PCM malfunction AWD control module malfunction
SYSTEM WIRING DIAGRAM	-