DTC U0401:68 Error Signal Received From Pcm: Notes

WARNING: This page is about a different car, the 2025 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0401:68 (FRONT BODY CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Error signal received from PCM
Detection condition	Front body control module (FBCM) receives the error engine coolant temperature (ECT) sensor or ambient temperature sensor signals from the PCM for 5s or more with the ignition switched ON (engine off or on).
Fail-safe	Not applicable
Possible cause	DTCs are stored in the PCM. Engine coolant temperature (ECT) sensor malfunction Ambient temperature sensor malfunction PCM malfunction Front body control module (FBCM) malfunction
System wiring diagram	Not applicable