Please Help, Overdrive Doesn't Work Anymore!!

i got a 91 carmry dx, other day the overdrive light just died. it doesn't also work anymore when i press it on the highway. what is my problem?? any solutions??

i got a 91 carmry dx, other day the overdrive light just died. it doesn't also work anymore when i press it on the highway. what is my problem?? any solutions??

Maybe it's just the bulb for the display.
If the overdrive still works, you'd still be fine.

its not the bulb for the display, because at high speeds when i press overdrive the engine rev is still very high.

There's an electric solenoid that controls overdrive.
Check wiring connections on the transmission case.