So on my way to work this morning the check engine light came on and D4 started flashing. This is my 3rd CL and I am familiar with the tranny problems. This car shifts smooth through all gears and has since purchase. Im thinking the VSS is causing both codes to be thrown. Any ideas or input? Im going to get the VSS this afternoon.

 

Did u end up fixing this problem?
i did an engine and transmission swap on a 97 Acura Cl 3.0, i put the engine and transmission of a 98 acura cl 3.0 everything is plug and play but i noticed that the rear Speed Sensor does not come in the 98 acura cl.

the engine starts and transmission shifts but after driving it i pulled the same check engine light codes as you did and my D4 shifting lights was flashing. For sure i know that the vehicle i pulled the engime and transmission from was working properly. I didn't know that the speed sensor behind in the rear wall did not come with.

Now I'm thinking of replacing the ECU thinking that there is an electrical issue. The 97 acura cl has two units One is the brain and the othe other a transmission control unit! could that be the issue? the 98 acura cl has just one ECU and it seems to also control the transmission. I nees help, i want to get this car going soon.

 

Problem was fixed, it ended up being the VSS mounted to the Tranny