Hey Guys My Sister Has a 2000 Civic DX Sedajn...Has 176,000 Miles...Automatic...Fluid was always changed with Honda ATF...DRIVE 4 Is Blinking and throwing Codes P1298 P1768
.Just Recently Started Knocking i Replaced Block....Never Removed Transmission And Once i Got it Back Together & Drove it for a Week & it ran Great and shifted Great No Signs of Any Sliping or anything...
After that Week I Gave Car Back to Her...She was driving in The Snow and Slide off Road Driver Side Hit Pole & It Broke Head Light and Pushed a/c Rad Into Header Etc....It Really Didnt Crush No Harness ...After That Impact She Had to Drive it Home In 2nd And it will Not Down Shift its Self and its Blinking D4...Didnt Have Any Problems or Codes Before impact...
So I Fixed All The Front End Damage & Made Sure No Harness Was Crushed or Anything....So Here I Am Things Ive Done to Try to Address This Issue...(Note) PLEASE WRITE ANY INFO OR ANYTHING YOU THINK....THANKS IN ADVANCE

CHANGED
Changed Out Lock Out Solenoid
Restart Battery & Cleaned All Grounds
Checked All Fluids
Removed All Transmission Plugs & Looked At Alll Pins and wires to make sure nothing broken
Changed ECU Out For a Known Good One
Swaped out or changed All Sensors on Transmission Execpt for The Counter /Main Shaft VSS & The Big 3 wire VSS



QUESTIONS
Could it be The ELD?
Is There a Auto trans ecu or some kinda box could cause this
Could it Be In the Shift Box Because its hard to get out of part kinda like alll

Let Me Know Anything you think thank you

 

im having the same problem but on my 00 honda civic lx