Mazda CX-30 2021–2023 — technical service bulletin
Bulletin SA-027-23 · NHTSA communication 10235699 · issued Apr 28, 2023
Technical service bulletin
communication type
Electrical System
component
2021–2023
model years
14
vehicle entries
Official summary
In-Vehicle Network Malfunction error message. DTC U3000:04 (Telematics communication unit internal malfunction) stored. NOTE: The vehicle does not apply to 09-001/23 because CSP04 is not "OPEN".
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.