Mazda CX-70 Plug-In Hybrid 2024–2026 — technical service bulletin
Bulletin SA-030-26 · NHTSA communication 11032023 · issued Apr 22, 2026
Technical service bulletin
communication type
Electrical System
component
2024–2026
model years
5
vehicle entries
Official summary
DESCRIPTION Some vehicles may experience one or more of the following DTCs with the Hybrid system warning light on. This may be caused by an issue with the sub battery located under the passenger floor. P143B Backup power supply system: Sub battery power supply low input. • U3008:01 BPS Backup power supply unit input/output circuit over-current/voltage malfunction. • U3003:17 BPS The output voltage sensor in the backup power supply unit detects that the voltage is standard or more. • U04C0:00 PCM Backup power supply unit internal malfunction. • REPAIR PROCEDURE 1. Remove the sub battery accord
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.