If it is a solenoid, they are about $100 apiece from FCP Groton. There are 3 or 4 of them (if I recall correctly 3, 1-2, 3-4 and torque converter lock-up (overdrive) under the black cover at the left front of the transmission. There is no "CHIP" in the transmission.
JS

There is an article I posted in the How To section re: replacement of shift solenoids. Not a real difficult job, but kind of a PTA. PO 755 is short, open or high resistance in the solenoid coil. If you need further information, email.

JS

http://www.nissanforums.com/forum_index.php http://forums2.freshalloy.com/

Non Volvo Here are a couple of good ones. I am sure that there very many of your vintage Sentras still on the road.
Nissans are the best Jap cars out there for longevity. I have ahd a bunch of them.

JS

I have a program in my garage laptop and an an OBDII Adapter from Harrison Research that I use. If you go to AutoZone, they will read your codes for free. I don't know if they give you the definitions. If not email me the code and I will let you know what it is.

JS

I need to get the center console disassembled sufficiently to replace the master power window switch. Anyone done this that can help;
Thanks,
JS

The fault I had was P0755 (shift b solenoid - open, short or ground) = shift solenoid 1 - in this case open (400 Ohms resistance). Other 750 series codes apply to the shift solenoid 1 and Lock Up solenoid. These codes are purely for electrical faults and have no bearing on the mechanical or fluid co...

I had a flashing arrow, stuck in 3rd, etc. PNP, right. According to many here, I was foolish in questioning that as I also had a code 755 (#2 Shift Solenoid). Changed the PNP, no effect. Changed the #2 Shift Solenoid and all is well. 400 Ohms vs Max 15 (New one was 12). Some on here are a bit sancti...

Code 755 (Trans Solenoid B) and flashing arrow, very slow acceleration (stuck in 3rd as I have read?). Couple of starts later and all is well. Anyone know of this problem and fix?