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Gary, Chevy Technician
Category: Chevy
Satisfied Customers: 16870
Experience:  15 years GM master tech
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2004 Chevy 2500HD Quad cab. Door lock activate and

Customer Question

2004 Chevy 2500HD Quad cab. Door lock activate and deactivate on their own.
Submitted: 1 year ago.
Category: Chevy
Expert:  Gary replied 1 year ago.

I am sorry your having this problem

they will all lock an unlock at random ?

does the interior light stay on like a door is open or it flicker on and off ?

Customer: replied 1 year ago.
The interior lights do not flash, or come on. It appears to lock by itself, and continues to try to lock itself. All doors seem to lock when it activates itself. Doors do not appear to unlock themselves.
Expert:  Gary replied 1 year ago.

will it randomly do this ?

will bumps make it happen or it can do this at a stand still ?

did this problem start out of the blue one day ?

was anything done to this truck to have this issue ?

Customer: replied 1 year ago.
It started by itself, no work was done to the truck, except for a rear transmission seal. It does it while driving, or just sitting in our driveway. Bumps do not seem to affect it. It is pretty random, but happens often. Almost every time we drive it, and many times when it is just sitting in the driveway.
Expert:  Gary replied 1 year ago.

from the sounds of this problem it can be caused by a door lock switch acting up signalling lock when you are not pushing lock or the lock signal wire from the BCM to the lock relay the grey/black shorting to ground to a bad BCM itself causing this issue

the best bet to narrow this down is to unplug both front door switch assembly electrical connections and see if it acts up which if it is going to act up just the rear door locks would lock if it still acts up

if it does NOT act up plug in one of the front door switches back electrically and see if it acts up if it does the odds are that switch assembly is bad if it doesn't act up plug in the other switch and if it acts up it is the switch you plugged back in electrically

if it still does this with the front switch assembly's unplugged then the grey/black wire from the BCM needs to be checked for any shorts from the BCM to the lock relay and repaired or replaced if bad

if that wire tests good the only thing left to cause this issue is a bad BCM i am sorry to say

Customer: replied 1 year ago.
How do I unplug the door switches?
Expert:  Gary replied 1 year ago.

you have to remove the door panel to access the electrical connections at the switches