Will i need a new transmission? on 2002 Mercury Mountaineer

The problems is the O/D light blinking fast then a signal sounds and "Check Transmission" message appears. Does this mean the worst? or is there a (hopefully) sensor or selonoid problem? Any help would be appreciated.

Asked by for the 2002 Mercury Mountaineer
there are sereral external issues it could be. seek a free diag and est from aamco then ck prices
With the transmisson check warning o/d light blinking will i be able to drive the car to a shop?
1 more answer
have it checked