your transmission is about done, sell it
if you have overdrive in that car it means that your about to go into overdrive
The overdrive light to flash on 2005 Ford Expedition is caused by either the sensor problem or the electronic pressure control problem for the tranny.
A malfunction has been detected
A malfunction has been detected - get it checked out
on our van it was the vechicle variable speed sensor. On mine it was the 1st sign of Transmission going out and $3000 repair
overdrive light keeps flashing
something is wrong in the transmission. It will have to be diagnosed. You probably have a bad shift solenoid in the tranny.
The overdrive is "ON" when the light is "OFF". Notice the light for the overdrive has a slash through it.
The light will flash if the vehicle senses that you should be in overdrive (based on speed) but aren't. There should be a button on the end of your gearshift lever to turn overdrive back on. The only time you should turn that off is, for example, if you are pulling a trailer in the mountains. Turn OD back on and the light will stop flashing. If it doesn't stop then there is a problem with the transmission going into overdrive.
There may be a reason why a Ford Expedition's overdrive light is flashing. Check the manual to see if there is a reason. If not, take your Ford to a mechanic.
So first I do not have this vehicle. In general when you see overdrive light flash or stay on, it means overdrive has been turned on. In most vehicles the overdrive button is either on the gear shifter or on the stiring colum. If you dong want or need overdrive on then just press the button. If your light stays on, then it could be something different and not so simple.
Normally the overdrive is allowed , so the overdrive OFF light does not light up When the overdrive is switched off , the overdrive OFF light will light up to let you know that the overdrive has been switched off