How to unstuck the shifter - 1990 Nissan Maxima

See this video. Very comprehensive coverage and how to fix.

https://www.youtube.com/watch?v=6CDAytTHVoU&ab_channel=MotorCityMechanic

if their is no battery it wont release brake has a switch needs power as well as ignition you have to mechanically undo the shift cable easier at transmission than from drivers seat

it looks like you have a problem with the shifting cable. release the cable from the transmission side and check functionality. replace or adjust .

There's probably a small hole around the bottom of the shifter, off to the side. If you have a small strong piece of metal like a small screwdriver, you can stick it through that hole and there should be a small button underneath to override the shifter lock.

I would start with a short squirt of WD40 around the stuck button and then try to work it, see if it gets unstuck.

I had the same problem with my 2009 Smart fortwo passion. Ended up being dirt in the switch that senses when you put the shifter in manual. Unstuck the switch and all is shiney again. The Smart forums give instructions on getting to the switch.

check the shift linkage . if shifter won't move the linkage is jammed if it moves freely its broken

Check clutch fluid, must be low. If not this, then do clutch adjustment.

I have a 2000 Alero Gx coupe.. Same setup. I had to use some sort of plyers, Grip the stock rubber shift knob, and twist to the left as hard as I could to get it unstuck, then set plyers aside, and unscrewed with my two fingers. Once off, that safety feature and spring slids right off. you can use it with a custom knob, unless you are cutting it down to make a short shifter (Or a short-shifter kit, either way works)
Hope this helps :)

check the gear stick make sure it did not come out of place