Either the switch on the lever is not adjusted or is going bad, or the return spring is weak. You could try spraying the cables where they enter the outer coverings with wd 40 or other spray lube and making sure that the cables are not hanging up as well. (good to do once in a while anyhow as maintenance)
I HAVE FOUND THAT MY CUSTOMERS SOMETIMES EXIT THE VEHICLE AND THEN SET THE PARKING BRAKE THIS COULD MISALIGN THE COPPER SWITCH [HARD TO SEE OR REPLACE] THAT IS BEHIND THE GEARED RATCHET OF THE EMERGENCY BRAKE. TRY WITH A FLASHLIGHT TO FIND THE COPPER SWITCH AND GENTLY RE-ALIGN TO MAKE CONTACT WHEN THE BRAKE IS FULLY OFF, OR ADJUST THE ONE SMALL BOLT TO REALIGN. YOU CAN, BUT NOT ADVISED TO TAKE A FLAT HEAD SCREW DRIVER AND GENTLY SEPARATE THE CONTACTS TO THE SENSOR, WHICH WOULD SHOW THE PARKING BRAKE IS NOT ENGAGED [ALWAYS] AND STOP THAT CHIME. BUT IF YOU DO, TAKE IT IN AND HAVE THE SWITCH REPLACED BY THE GM DEALER, OTHERWISE YOU COULD DRIVE WITH YOUR PARKING BRAKE 'ON' CAUSING HARM TO YOUR BRAKES...
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