Automatic Transmission Control Module problems of the 2019 Nissan Altima

On August 30, 2025, while driving on the highway, my 2019 Nissan Altima displayed a “cvt (at) hot / power reduced” warning. Power was limited, but the engine did not shut off. I immediately scheduled service at paul miller Nissan in fairfield, CT. At the September 2, 2025 visit, the repair order stated: “customer states cvt (at) hot power reduced display in dash. All past codes stored; cleared all past codes stored. ” no complete diagnostic test, cvt pressure test, or fluid inspection was performed. The dealership did not preserve the freeze-frame data from the tcm. I was told that no current fault codes were present and that the vehicle was safe to operate. Relying on the dealership’s professional assurance, I continued normal use of the vehicle. About a couple of weeks later, the vehicle began to jerk and lose smooth acceleration intermittently, worsening by the sixth week. I promptly returned for service. On October 21–22, 2025, the same dealership confirmed transmission codes p0776 and p17f0, diagnosing a cvt failure and recommending full replacement. When questioned about prior diagnostic data, the service manager stated that all data from the September visit had been cleared and that the freeze-frame information was deleted and no longer available. This handling contradicts Nissan’s standard cvt diagnostic protocol, which requires documenting stored codes, inspecting cvt fluid condition, and recording internal temperatures before clearing data. Nissan consumer affairs later stated their review relied solely on the dealership’s findings and that missing diagnostic data would not be retrieved. Since the confirmed failure, I have been forced to rent a vehicle at my own expense, exceeding $1000 to date. The vehicle’s reduced power and transmission failure created a serious safety risk, especially as I transport my children in this vehicle. The dealership’s erasure of diagnostic evidence prevented accurate evaluation and timely repair. The issue remains unresolved.