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1999 RX300 Transmission fails to engage in overdrive (high gear)

I am looking for a likely solution to this 1999 Lexus RX300 4WD transmission that usually does not shift into high gear (overdrive).
My suspicion is a malfunctioning shift solenoid just inside the transmission pan, or a torque converter solenoid. Instead of shifting at 45 mph normally, it shudders, or only occasionally completes the final shift. The other lower shift patterns perform normally

The dealer parts department sent me a diagram with part numbers showing the shift solenoids in the transmission, however they have not been helpful in identifying what function each solenoid controls

Any other solutions are welcome Also, would like to locate a cheaper source for the parts than the dealer
Thanks,
Mark

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  • Lexus Master
  • 4,536 Answers

U need a shopmanual..library sec629. Autotrans r so complex it may just b a bad connect etc. Get car scanned to show a datastream. It takes a factory tool..seek a privateshop

Posted on Mar 20, 2017

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Posted on Jan 02, 2017

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SOURCE: ? to Replace Timing belt on 2000 Lexus Rx300 with 57,000 miles.

If it is running perfectly I wouldn't think that you would need to replace the timing belt. You shouldn't need to replace that until 100,000-120,000 miles. I would definitely hold off until now unless you have start having some timing problems. Let me know if you have any other questions. Thanks for rating my response and for using FixYa!

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SOURCE: replace side marker light on lexus rx300

Remove 3 - 4 screws on fender cover close to side marker light. Pull fender cover out a bit for you to use your other hand to reach side marker light. By twisting on one direction and here you go the light out. Replace new bulb and replace everything on reverse order.

Posted on Aug 18, 2009

Murphybanton
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SOURCE: Lexus RX300 engine light n VSC light comes on

VSC means Vehicle Stability Control.

It comes on when the sensor send a signal that the vehicle is not stable on the ground.....check the wheel balancing and alignment and the air pressure of your tires too.

Good luck.

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Posted on Aug 23, 2009

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SOURCE: 99 lexus rx300 has engine miss on cyl 2,4,6 all

2-4-6 could be a fuel or ignition issue, hopefully not a valve. If you have the engine tested at the dealership they will attach a code reader under dash to analize and this should help pinpoint the problem.

Posted on Jan 10, 2010

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SOURCE: not shifting into overdrive and check engine light

LEXUS RX 300 99 MY CK ENGINE LIGHT WON'T GO OFF

Posted on Mar 10, 2010

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Why is my lexus rx 300 not going into gear 5


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Does the overdrive only engage 4th gear? or does it feel like the gear ratios are different between overdrive and normal before the problem happened? some overdrive buttons engage final gear and some do as much as change gear ratios like in a cvt (contantly variable transmission) and some just change the timing in the gear changes to provide more rpm/power.
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Start by checking the least expensive items:

Make sure you are not activating the O/D switch in the shift stick inadvertently.

Look at the display panel, if the "Eng" light is on, you must get the code and repair the affected item. If you have knock sensors and/or oxygen sensors malfunctions that may prevent the transmission from shifting to O/D.

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Always start from the least expensive and recheck the obvious. Good luck.

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http://circuitboardmedics.com/1999-2003-lexus-rx300-hard-transmission-shifting-ecm-ecu-computer-repair/

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