This problem started after I had the transmission replaced.2004 Accord 2.4 engine Automatic trans. The shift display on the dash green light starts to flash on the highway after you go above 55 MPH .
Seems as if there is another pattern that that I have discovered. If you go for approx 10 miles at 50 MPH then accelerate , the light doesn't Flash .Somebody says its a slipping overdrive clutch But it seems more electrical as the light wont flash when you give it the initial 10 miles at 50 MPH. thanks J. Small Vancouver B.C.

 

If it like the older accords, the computer is detecting something wrong with the transmission.

There should be some information in the owner's manual about that light if it is flashing.

 

That's just like a check-engine lamp for the auto-tranny. In 2004 I think there's no longer any SCS connector that you can jumper with a paperclip. Gotta go to some car-parts chain store, have them plug in a scanner & read the error code.

Down here in USA it's AutoZone or AdvanceAutoParts. Maybe Canadian Tire does that?