Transmission stopes switching

i too am having the same issue. very odd and frustrating. now becoming a danger. from a standing start, transmission stays in 1st gear, and then totally slips, as if in neutral. have to pull over, turn off car. let it cool down for 5min or so, turn over and start again. most of the time issue goes away. has been increasing in frequency of late and now when i start up again, stays in 1st gear. no signs whatsoever of overheated or worn trans. multiple shops and local dealer have looked and found no issues and cannot replicate the problem. can go for months at a time with no prob, then in one week hit every day. or multiple times in one day. is it the sensor? the cpu? trans has been checked and looks totally fine.

yep mine too 01 i30

I recently started having this exact problem, has anyone found a solution?

I am going crazy I am having the same problem with my I-30 Infiniti it's making this squealing noise and it goes and first and second gear and after that it stays in 3rd I don't know what's wrong with it but I'm thinking it could be a sensor or something I change the filter in the transmission fluid and it's still doing the same thing please help me someone up there what could be the problem?

I feel my transmission slipping a while ago on my Infiniti 200I i30 and that being the spindle in the front what is the barbarians I replace them and now my car runs perfectly so if you having a problem where you think your transmission ain't changing gears it could be the front spindle check it out before spending too much money trying to get it figured out easy fix .

https://youtu.be/H7pdd7weP6I

https://www.ebay.com/itm/OEM-Transmission-Solenoid-Kit-Pack-31940-85X01-For-Maxima- Sentra-Altima-RE4F04B/123910635644? ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2057872.m2749.l2649

This is my last resort it's summer and I want to get around in my car. Will have this done in a week or two wish me luck. I will send a message of the results on a hot day I will surely find out!

Already replaced spindle.

I am having problems with the trail arm and it's replacement or repair

Change your trans speed sensor just inside left front wheel