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Overdrive light on column shift arm blinking.
First think I did was replace the neutral safety switch on the driver side of the transmission.
Still blinks.
Disconnected battery overnight to reset codes.
Still blinks.
I have driven 200 plus miles since installing the new switch.
The transmission shifts fine, even into overdrive.
I have found a very technical protocol to uncover the problem in the "A" circuit but honestly, most of it is over my head.