Transmission D4 light constant only second gear

not shifting into third and fourth and will only go into first if I manually shift it there. Only using second gear. The last time I drove the car into town it was operating fine and utilizing all gears shifting on its own. But on my way back home I noticed it wasn't going into third or fourth and D4 light stays on regardless of what gear I have it in including park. When I come to a stop I have to drop it manually into first or it will just stay in second. I found what I believe to be the diagnostic plug lower right of the glove box and jumped it. It does not change the D4 light. I get no light anywhere flashing a code. Thanks for the help!