SOURCE: 08 avalanche pass side power door lock not working
if you have any knowledge of automotivce electrical, (and that you need to use a "circuit tester" and not a test light) test for power when someone presses the button. it wouldnt be uncommon for most vehicles for the lock actuator/solenoid/duty actuator to wear out, get weak and fail. this is most probable. given that this is an 08, have you checked withe dealer to see if its still under warranty. if we are only talking a few miles and they wont do anything, look in your owners handbook and get the 1 800 number and get GM's customer service involved. cheers.
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