Mazda B4000 1998 O/D flashing light

[rickanet]

The light is only flashing occasionally. When it is not flashing, the transmission works perfectly. When flashing, it shifts up and down very roughly and will not get in O/D. To fix the problem, I just turn off the engine for 4-5 seconds and restart. Problem solved, until the next time. It only gets in flashing mode when driving at low-med speed i.e. when not driving in O/D. While driving on the expressway in O/D it never does it.
Since it is starting to do it more and more often, I need to find the real problem. Any suggestion?

 

[JK080]

The flashing light means there is a trouble code stored in the computer related to the transmission. You will need a scanner to get the code, this code will be able to point you to the trouble area.

Without the code you can only guess.