Why is my overdrive light flashing on my 2001 expedition

SOURCE: 1998 ford expedition blinking overdrive light

This blinking light indicates a problem. You will have to have it scanned for trouble codes to find out
what it is.

SOURCE: overdrive light is blinking 2001 Ford Expedition

the OD light blinking is telling you that there is a problem with the trans. most auto parts stores will read the codes for free.

SOURCE: Overdrive light flashing on 2001 F350 7.3 diesel truck

Taking a guess at it, I would have to say that the transmission fluid is thermally broke down from the heat, and stress from towing. Try to change transmission fluid and filter. If this does not fix it the transmission itself may be damaged from the excessive strain, and heat. (heat is number one cause for transmission failure. After this problem is fixed, next time NEVER tow in Overdrive. This over works the transmission, and creates the excessive heat. If you tow a lot than consider adding an after market transmission cooler. Which is only approximately 100 and up, but will save thousands in the long run:)

SOURCE: 2001 F-150 the "OFF" light

replace the over drive button

SOURCE: Ford expedition light will flash

Have codes pulled.