Overdrive light blinking

[f350psd96]

Overdrive light is blinking. Just started yesterday. Doesn't happen all the time but when it is blinking transmission shifts hard and I have no overdrive. Brought it to a transmission shop and there were no codes. I was on my way to school (3 hours away) and couldn't drop it off to determine the actual cause. I was thinking maybe the vss sensor, solenoid or the overdrive wire is rubbing against the steering column. I don't want to bring it to a shop just yet. any suggestions? Any help would be great!
Would also like to note that the overdrive button on the shifter never worked.

 

[JSchuricht]

Take it someplace else. There is a code but you need the correct scanner to find it. With a good scanner you can also check the OD button. Otherwise just flip a coin, you could need a $30 sensor or $4000 transmission. Also if it's the VSS, your speedometer will be jumping around.

 

[f350psd96]

Thanks! Will try a different transmission shop

 

[TjMiller]

Had this happen, could clear the code with my scanner but would not show code on my scanner. Showed up on a snap on scanner was torque converter slipping... drove fine couldn't feel it but the computer saw it. Like was said find someone who can properly diagnose.