Alexw

I have recently learned from this forum that my GS450h has an additional automatic gearbox that activates between 55-65mph as well as the CVT. Can anyone advise if the manual gear shift which has 6 positions has any affect on this? I have only ever used the manual selection 3 or 4 for additional engine breaking on a steep decent and have always used the D position for acelleration. Is there any advantage using the manual shift during acelleration or is it just there for assisted breaking?

Yes that's exactly it. In the video the auto gear change is a very slick change compared to my older 2007 model which is slower to change, but now that I have learned that there is an extra automatic gearbox in addition to the cvt it makes perfect sense. I will now be able to understand what is going on when accerating from 55mph upwards & alter the throttle demand accordingly to allow the auto gear change to take place more smoothly. Thanks for all the information

Thanks for the heads up. I didn't realise there was cvt multi changer that is actived by transmission fliud Pump between 55-70mph. I have just looked up the 'loss of gs450 power' post from Haynes in 2014 & that sumarises all the symptoms I am experiencing. So possibly a failing pump. Saddly I don't have the DIY skills to attempt a repair myself but a least I now know what to ask a garage to quote for. Many Thanks for your advice

Thanks for your replies. Interesting that others have experienced the same sudden loss of power blip under full throttle which instantly recovers. It happens even if the traction battery is at 70% but the hard acceleration recovers after 68mph or more so I am thinking more of a software design fault if other have the same issue. Compared with a 2021 Toyota Prius with much lower power, the Prius has smooth acceration at 100% throttle from 0 to 70mph + without any sudden loss of power like my 2007 GS450h does

A steady acceleration using 60% throttle from 55-70mph is smooth however if using 100% throttle from 55-70mph when reaching 65mph it is as if the throttle has been backed off to 50% but just after 67mph it is back to 100% & continues to accelerate as pre 65mph. Any thoughts? Faulty mass airflow sensor perhaps?