I just installed a new (used) transmission in my 02 civic. I am getting an error code... flashing d light. The code is p1753. The car drives but is sluggish in the low end. Any input as to shere and what I am going after. I still have the core so ican draw parts off the old transmission. What am I looking at?

i just installed a new (used) transmission in my 02 civic. i am getting an error code...flashing d light. the code is p1753. the car drives but is sluggish in the low end. any input as to shere and what i am going after. i still have the core so ican draw parts off of the old transmission. what am i looking at?
Solenoid on Tranny Bad.. I think..

Yeah, swap solenoids out.