So I recently put a JDM transmission in a 01 honda civic ex It is now throwing a code of 0740 and 0700 I know the second one is a generic code and caused by the other one. The car runs and shifts fine if the light was not on you would not know there is any issues. im thinking the lock up solenoid may be clogged foolishly i forgot to check it before putting it onto the jdm because I had to replace all sensor and solenoids before putting the jdm in any help would be appreciated

 

The transmission may be a mismatch for the ECU.

 

Well I got the Japanese equivalent they said it would be OK if I changed out all sensors an solenoids is there a way to check if that's the problem will a better scanner give me a more defined code?

 

Why did you replace the transmission? Did you also replace the torque converter?

You also might try 3 drain-refill cycles with Honda ATF.

 

 

Last trans was shot and yes replaced converter

 

Was P0740 thrown?

 

I'm not sure if the previous transmission threw the code I'm sure it did it was shot did nothing. I did have to take the sensors n solenoids from the blown trans n put them in the JDM I'm really thinking its one of them seeming it runs and drives fine but who known yes the JDM is throwing the P740

 

I don't have the service manual troubleshooting diagrams related to P0740 for your specific car. Maybe somebody else does and will post them for you.