DTC P081D-29: Neutral Switch Error Signal Received [Start Stop Unit]: 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 P081D:29 (START STOP UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

Description	Neutral switch error signal received
Detection condition	Start stop unit receives the neutral switch signal error signal from the PCM for 1 min or more with the ignition switched ON (engine off or on).
Fail-safe	Perform the control with neutral switch signal turned off.
Possible cause	DTCs are stored in the PCM. Neutral switch malfunction PCM malfunction Start stop unit malfunction
System wiring diagram	Not applicable