I have an 06 gs300. Lots of research reveals pcm problems very common causing shift problems. There are many companies that rebuild , see Ebay listings. Mine starts blowing through shifts quickly when warmed up. Ive soldered on the pcm. I may send it out. It is shifting better after resoldering the trans circuits , resistors in the pcm. Still not right though.
Transmission Stuck In 3rd Is250 06 A960E P2714 P2757 P0761 Torque Converter
in 07 - 13 Lexus IS250 / IS350 / IS-F
Posted
I have an 06 gs300. Lots of research reveals pcm problems very common causing shift problems. There are many companies that rebuild , see Ebay listings. Mine starts blowing through shifts quickly when warmed up. Ive soldered on the pcm. I may send it out. It is shifting better after resoldering the trans circuits , resistors in the pcm. Still not right though.