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DTC U0401-64: 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 U0401:64 (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
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