gs450h wont start

[richybear]

hello i got a 2007 gs450h with 135k miles car was driving  perfect untill  i parked it at my house using my other cars for couple days  on 3rd day i went to go move it car wont start noriced massage check hybrid system car  was moving back and forward  but i didnt want to take chance so i did diagnose it with my launch scaner and i had code u0100 lost communicatio with ecu  when i turn the igniton on the radiator fan screams   i replaceed the 12volt batery  no change the drive battery has  80 k miles and its 5 years old 

thank you 

[RX400h]

This web page contains some general checks after the U0100 code is retrieved.

U0100 Code & How To Fix It - PCM Repair - Solo Auto Electronics (solopcms.com)