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have you looked on the repository? look in express vans 1500/2500. if not get a different ECM or use the GM tech tool to update the OS.

can you add more PID to the scanner? The current gear, the tcc pwm duty cycle, shift time, input seed sensor and output speed sensor would be nice also. seems like the car runs warm also. do you have...

have you checked the repository? search in express vans 1500/2500 they used mostly 4l80e trans. you can try to find a computer at a you pull it yard also just look vans of roughly the same years and...

do you have any scanner runs? when he installed the 4l80e did he update the wiring for the 2nd speed sensor? Im assuming you did a segment swap for the 4l80e trans?

If you are still working on this look into express vans 1500,2500 they had 4l80e in almost all of them

I'm a little late to this thread but I had the same problem with my 01 ecm. I changed under system> ac > Type fitted to (analog cycling) and now my fans run off of temp. Hope this helps someone...