I need some help solving my problem with my speedometer went I turn the car on the speedometer goes to 20 MPH and it gets stock there even if I’m driving, but sometimes it goes back to normal, and I went I turn off the car and try to turn it back on it will go back to 20 MPH.

Any help will be appreciated

5th Gen Accord 96 EX

 

Has the ecm (engine control module (computer)) set a warning lamp yet ?

P