Electrical System Related Problems of the 2023 Mazda CX9

Electrical System problem

Starting [xxx], through [xxx], we began receiving multiple "critical vehicle malfunction" alerts (46 alert messages)via the Mazda app, including "parking brake malfunction" and "electric parking brake malfunction. " during this time, the vehicle experienced delayed starts and eventually required a jump-start. We brought it to the dealership multiple times to show the messages, before our 3-year/36,000-mile b2b warranty expired, but the issues were dismissed until the battery was finally replaced. At just over 36,000 miles (currently 39,646), a new issue emerged a “thud” sound from the steering wheel. The dealer diagnosed it as a failed u-joint shaft, which was deemed non-serviceable and not covered under warranty. I inquired about potential causes or prevention—no clear answer was known. I found relevant NHTSA tsbs (06-001/20 & 06-001/24) related to steering issues and escalated to Mazda USA. Mazda agreed to cover 50% as a goodwill gesture, leaving me to pay about $500. Two weeks later, the part arrived and was installed—but it did not fix the issue. The dealership now says it’s a failed bearing within the electric power steering (eps) unit, which requires complete replacement at a cost of over $2,000. Only one part is available in the u. S. , with another two-week wait. The original (misdiagnosed) part was already sent back to Mazda. My out-of-pocket cost is now $1,151 and rising. Given the early warning alerts, misdiagnoses, and the fact that eps controls several safety-critical functions (steering, cruise, lane assist, etc. ), I believe this is a fundamental system failure that should be fully covered under warranty or as a safety-related goodwill repair. I respectfully request that Mazda assume full financial responsibility for the replacement and any related work. Thank you for your consideration. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).