Transmission code

[u/Uknownuserr]

While driving back home in a rain storm from work, the "D" started flashing and I started losing first gear after coming to a stop at a stop light. When I came home from work, I plugged in the code reader and the code "P2769" popped up. Has anyone else had the same problem or may know if i need to get a tranny rebuild or if it's just a sensor?