When the overdrive off light flashes it means the powertrain
control module has "received" information of a transmission problem.
Take it in to the dealer or other transmission repair professional,
continuing to drive with the O/D OFF light flashing can result in
damage to the transmission.
The overdrive off light flashing - indicates a malfunction has been detected
overdrive light keeps flashing
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.
A malfunction has been detected
When the overdrive light blinks that means a malfunction has been detected - get it checked out
What can be the problem with the overdrive light flashing on and off?
According to the 2003 Ford Expedition owners manual : If your Overdrive Off light is flashing : " have your vehicle serviced as soon as possible otherwise damage to your transmission can occur " ( it might just be a sensor )
The flashing red light is for the factory security system that comes with your vehicle, I own a 2002 Ford Explorer and we have the same thing...
A malfunction has been detected
When the overdrive off light is blinking that means a malfunction has been detected
blinking overdrive light indicates a transmission problem. take car to a transmission mechanic
Usually a flashing Overdrive light on any Ford with an Automatic Overdrive is a sign of an internal failure. Seek the assistance of a qualified mechanic or transmission repair shop.