Lexus Troubleshooting Questions? Ask a Lexus Expert
Hello and thank you for your question,From the sounds of it it unfortunately is sounds like the transmission has failed. It will not hurt to at least try changing the trans fluid and filter but it may not work if in fact the transmission has failed. Another thing you should do is to scan the computer system to see if there are any transmission fault codes setting which there should be if the problem is an electronic control issue. If after doing this and changing the fluid and there are no codes and the transmission still will not engage then sadly that means it has failed internally. Sorry to say this is not good news nor a good new answer but I suspect I am right.