Why is my car not shifting into a high gear? its only revving?

The Check Engine Light is on? Did you read the DTCs.

The second link has the answer, the first link says it is a known issue. It is times like this you need the Dealership or a good auto electrician.

Transmission won't shift to third until temp rise

ClubLexus https://www.clublexus.com > forums > 713188-transm...
Apr 1, 2017 - Transmission won't shift to third until temp rise ... The solution is to drive slow and keep rpms at 2.5k and 3k at max till the engine and transmission warm up.
Sometimes transmission wont shift from 3rd to 4th - ClubLexus
Aug 23, 2021
Won't shift from 3rd to 4th gear - Lexus Forum Discussion
Jan 25, 2011
RX300 not shifting into overdrive. - Lexus Forum Discussion
Jul 11, 2013
FIRST POST! RX300 no 4th gear a full year. Fixes? - ClubLexus
Jan 9, 2013
More results from www.clublexus.com

Owner of Lexus RX300 with 182000 miles. Recently the ...

JustAnswer https://www.justanswer.com > lexus > 3wsxt-lexus-rx3...
Aug 22, 2010 - Recently the transmission won't go into overdrive. Stays in 3rd gear like when you press the o/d button to do so. When car is cold (live in ...
1 answer · Top answer: Hello and thank you for using just answer! The check engine light is on correct?

https://www.google.com/search?q=Lexus+RX300+will+shift+into+overdrive+once%2C+and+after+slowing+down+it+won%27t+go+past+3rd+gear

..

Corrupt adaptive shift memory. Try clear and relearn.

https://youtu.be/jWMliD_3s3o

05 Chrysler pacifica is a 4 speed automatic, next time buy a car with a 5 speed automatic

when engine light is on pls go to nearest autozone and scan the car its free.and let us know whats the code.
Hope this will answer your question,If do pls click on helful botton and you can follow me at fixya,so I can answer your question faster.thanks.

check and replace the TCM

Hi,

This might be because of the gear box problem. By any chance, did your car face flooding? In such cases, please drain the gear box and replace it with new gear fluids. Also, check if you go in low speeds, you might be able to engage it with ease. Please come back to me if you feel this doesnt solve your issue.

Regards,
Hari

Check transmission fluid. If that is full, try changing the fuel filter. It could be starving for gas, and trying to shift but can't. It could also be the speed sensor, or shift solenoid.

Hi All

I have a s40 1.9d / 2000 plate,
In the last month or so the car loses revs when changing up to 3rd and 4th gear, I can only get 50 mph max in 3rd gear 80mp in 4th.
The car has just clocked 185,000 miles
Its a great car but a pai at the moment, I've had a service including fuel fillter change added fuel cleaners to the deilsel all to no avail


Any suggestions

The Transmission is likely shot. That year along with others had transmission defects. My new 2002 TLs died at 21k miles. I go to Acura for most all service and they gave me a $1500 discount on a tranny. It still cost me $3500.