EG9 K20A3 4/12/2012Sorry to welcome you to our exclusive "dreaded E" club. The problem most had, was that the torque converter was not locking up due to a problem in the valve body of the transmission.
If you have the same problem as others did the steady "E" will go away when you restart the car (note: Ford says do not drive the car if the "E" is flashing as this indicates an imminent serious problem) if you drive around under 30 mph the "E" won't come on.
When service tech plugs in the laptop diagnosis computer it will say "torque converter lockup failure".
Most people had the valve body replaced, but my dealer fixed the original valve body (His explanation a piston moves back and forth to engage the torque converter due to some metal shavings debris left over from the manufacturing process the piston gets hung up clean it out and it works like new). I have put on 6000 trouble free miles since the fix.
Please remember that all of this is just "nice to know" information for you. Don't go to the dealer demanding that they replace the valve body. Let them diagnose the problem and fix it in their own way. (My dealer’s first try was to reprogram the transmission computer which didn't work and then he continued on to fix the valve body)"
"Steady "E" is drivable.- Flashing "E" have it towed.
If it is the same valve body problem that most of us have had, after you shutdown the car the display will reset to normal (ie: D5 etc.). You should then be able to drive under 40 mph without the "E" coming back on.
Drive for a while under 40, then drive faster. If the "E" comes on at the higher speed it is the torque converter not locking up which is caused by a sticky rod in the valve body.
Most people have had the Valve body replaced to correct this problem, but my service department just fixed it for me in less than half a day.
If they tell you that the main computer or the dash display unit needs to be replaced, that "fix" take a long time and don't usually solve the problem (ie: they replace the display unit, then you get the "E" back , then they tell you that the valve body now needs replacement.