DTC U0401-86: Error Signal Received From Pcm [Retractable Hardtop Control Module]: Notes

WARNING: This page is about a different car, the 2020 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0401:86 (RETRACTABLE HARDTOP CONTROL MODULE) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Error signal received from PCM
Detection condition	The retractable hardtop control module receives an error signal from the PCM with the ignition switched ON (engine off or on).
Fail-safe	Stops retractable hardtop operation
Possible cause	PCM stores DTCs PCM malfunction Retractable hardtop control module malfunction
System wiring diagram	Not applicable