Transmission overdrive rx300

TUCKER12

MEMBER
2001 LEXUS RX 300
6 CYL
2WD
AUTOMATIC
143,000 MILES

Rx300 won't shift into overdrive sometimes. Starts out fine shifting into overdrive and after a few starts and stops it stops shifting into overdrive. Have to stop the car, turn the key off and on, then it will shift into overdrive for a few times and then stops shifting into overtime. Changed the trans fluid and filter a couple of times, doesn't affect it. Car runs and shifts reat other than that. Thanks Jim

5 Replies

KHLOW2008

MECHANIC
41,815 POSTS

Is the Check Engine Light indicating?
Have you tried to retrieve for trouble codes?

Transmission control system has self-diagnostics and if any error occurs, there is a possibility trouble codes would be stored in system. Get a scan done to retrieve for trouble codes and let me know what they are if any found.

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Sunday, December 26th, 2010 AT 10:47 AM

TUCKER12

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3 POSTS

The check engine light is on with the code for the o2 sensor bank 1. The check engine light has been on when the transmission was working correctly. I had it rechecked and showed no trans codes.

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Monday, December 27th, 2010 AT 2:02 AM

KHLOW2008

MECHANIC
41,815 POSTS

If no codes are found, it would most likely be a fault with 3-4 shift valve and/or underdrive clutch.

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Monday, December 27th, 2010 AT 1:32 PM

TUCKER12

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3 POSTS

Could it be a solenoid being it will reset only when I turn off the ignition switch and start again? And if so where might that solenoid be located.
Thanks

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Monday, December 27th, 2010 AT 5:29 PM

KHLOW2008

MECHANIC
41,815 POSTS

If it is a solenoid problem, trouble codes should be present. Solenoids are at the valve body which requires the transmission oil pan to be removed for access.