Usually light is on as a warning it is off. Most have on/off button on 1 of the stalks.
if you have overdrive in that car it means that your about to go into overdrive
it has a malfuction so its setting a code
A malfunction has been detected - get it checked out
something is wrong in the transmission. It will have to be diagnosed. You probably have a bad shift solenoid in the tranny.
what would transmission not to shift in to overdrive
The Overdrive Light flashing indicates an internal transmission problem which could be caused by anthiny inside the transmission. Most likely the transmission would have to be removed and taken apart to find the problem.
the overdrive sencer
It shows that there is a problem with the transmission. Just like the check engine light, the overdrive light has codes that tell you what is wrong with the transmission and the various components connected with 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.
take it to a trans shop.
the shift pattern select switch in the center console turns the light on or off. it should also sat "power" on it.
A malfunction has been detected