transmission

Hello, I’m Pete from the Car Genius team at RepairPal. I’m sorry you’re dealing with this concern on your Lexus LS400. Based on the information provided with how the transmission shifts properly through lower gears but will not shift into overdrive this can indicate a few different things causing this concern. A faulty torque converter lock up solenoid, a wiring concern to the solenoid or to the computer itself, an internal fault in the computer, a mechanical fault with the torque converter, valve body concerns, or other possible causes. I recommend having these checked into/diagnosed properly to pinpoint which component is creating this concern so it can then be repaired properly from there. This is something a reputable repair facility should look into to help pinpoint which component has to be repaired or replaced. If you’d like to find a trusted, certified repair shop in your area, you can check here: https://repairpal.com/certified. If you need more advice, or have any further questions about your vehicle, we’re here to help. Just give us a call at 877-913-1554 where we will be happy to assist!