my honda accord d4 or overdrive keeps flashing even when its in park or any other gear, the only way to shift is too, go from 1 up to 2 up to d3 or d4 and then it works, cannot take off in drive 4, it wants to stay in first gear and not shift, please help, have already replaced ecu, and it worked for a while but now it is back

 

you have a transmission fault code and you need to diagnose it. sounds like a bad solenoid.

 

hey mine was like that too. when i changed my speed sensor it went away.

maybe its that.