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2002 C5.Passenger side will not lock or unlock with key fob. It was only unlocking so I locked and unlocked it manually a few times, now it does neither. Manually it works ok and drivers side will lock and unlock with fob.
I can hear the solenoid click when pushing lock or unlock on the fob or the door itself?
Its the door lock module. The relaays are cheap and its a common issue. You can change the relay by breaking down the module or do a module change. I had one replaced under warranty but its going bad again
Take a look at Bakersfield's thread and you'll find all you need to know.