97 jeep grand cherokee larado

I have a 97 grand cherokee laredo with a check engine light p1762. gov pressure too high. I have replaced the sensor, checked out-tested the wiring to the computer, had the computer reflashed, and serviced the transmission. scanned the computer on a running test with all pressures at normal range. After resetting the code the light will come on in appx. 40 miles??
trans is a 42re