I have a 2005 Nissan Maxima 3.5sl it was given code po770 so I put a vaulve body in it and now it is giving code for torqe converter clutch switch. But it you take off battery cables it runs perfect for a while till code kicks on. Can anybody help me fig out witch one it is and what to do please.

 

Maybe give you tube a try, it's surprising the info they give out.

 

I’d suggest that you post up all the codes you’ve gotten/you’re getting.

https://www.autocodes.com/p0770_nissan.html

 

It is giving codes p0740 now but was giving code p0770

 

Both of those DTCs identify a couple/few identical common causes. Have you made sure those have been addressed?

Also, you’ve stated that you’ve replaced the VB. I’m assuming with a used/salvaged unit?

Those DTCs don’t indicate a failed/failing VB. They indicate a failed/failing shift solenoid.

Perhaps some diagnoses related to the individual shift solenoid indicated by the DTC would be appropriate.