2024 Mazda Mazda3 Powertrain & Transmission Problems

left-most lane of a three-lane highway, I pressed the accelerator to maintain the flow of traffic. The vehicle suddenly began revving between 4,000–5,000 RPM without increasing speed. When I attempted to accelerate again, the RPM remained around 3,000, and I immediately received multiple warning messages on the dashboard, including: “Skyactiv Partially Disabled” warning Engine Malfunction warning ATF (Automatic Transmission Fluid) warning light Simultaneously, the vehicle rapidly decelerated from 65 MPH to approximately 55 MPH, creating an extremely hazardous situation and nearly resulting in a collision. I had to carefully maneuver across lanes to reach the shoulder. After shutting the vehicle off and restarting it, the warning lights temporarily cleared; however, the vehicle appeared to be operating in limp mode. I had the car towed home via AAA. After this near-fatal incident, I scanned the vehicle using an OBD2 reader and retrieved diagnostic trouble codes P0780 and P0761, indicating Shift Malfunction and Shift Solenoid 3 Performance issues. To address the issue proactively, I had my mechanic perform two full transmission fluid and filter exchanges on Monday, February 16, 2026, and again on February 18, 2026. Both services included a pan drop, replacement of the transmission filter, use of Mazda OEM transmission fluid (0000A7115QT and FZ01-21-500), and a complete transmission relearn procedure after each service. Despite these efforts, the same codes (P0761 and P0780) reappeared when scanned with a professional-grade diagnostic tool. The battery has been tested and confirmed fully charged. Additionally, my mechanic identified oil leaking from the timing chain cover.