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this could be a couple of problems the switch itsself would be the first thing I would check fords are bad on them going out. Does the overdrive light ever blink on and off?
Blinking O/D light is a warning to the driver that they should take it to a qualified repair shop. Also for the technician that DTC'S - diagnostic trouble codes are stored that will point a qualified tech to a problem for testing , electrical circuit's ,componets etc.... You have no idea of the complexity of these systems . Your best bet ,take it to a qualified repair shop ! Transmission Control Indicator Lamp (TCIL)
The transmission control indicator lamp (TCIL) is located in the instrument panel and is labeled O/D OFF. It is illuminated in conjunction with the TC switch.
The TCIL will flash if the EPC solenoid circuit is shorted or a fault has been detected in a monitored sensor used for transmission operation.
This is indicating an issue with the transmission that should not be ignored. The flashing light was designed to annoy you into action. Waiting could cost you a lot more money. I would get the error codes by asking my local shop to get them, or many chain auto stores offer free code reading, just ask. I was at AutoZone a few weeks ago and got the codes, and they printed them off for me, in addition to recommendations as to the cause.
Best case scenario is just a reset is necessary (computer perhaps). You don't want to be stuck on the side of the road, so it's good to find out.
All I can tell you is that the green light indicates your overdrive. It usually only lights up when it is turned off. There should be a green button on your shifter right under the button you press in to shift (say, from park to drive).
if the overdrive light is blinking then there is a problem with the TCM transmission control module. if you have access to a scanner, pull the codes, that will lead you on the path to what is wrong. if you dont you will have to take it for service.
The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.
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