DTC U0442-00: Invalid Data Received From Pcm (Local Can Between TCM And Pcm): Notes

WARNING: This page is about a different car, the 2016 Mazda CX-5. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0442:00	Invalid data received from PCM (local CAN between TCM and PCM)
DETECTION CONDITION	Under the following condition, the TCM detects the invalid PCM signal for 0.5 s : Battery voltage is 10 V or more .
FAIL-SAFE FUNCTION	Set to TCC control. Inhibits learning control. Inhibits manual mode. Inhibits neutral idle control. Inhibits 5GR and 6GR. Inhibits shift down when the accelerator pedal is depressed.
POSSIBLE CAUSE	PCM DTC is stored.
SYSTEM WIRING DIAGRAM	Not applicable