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post #1 of 4 (permalink) Old 12-29-2017, 03:26 PM Thread Starter
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Issue with Power Locks on 2008 Cobalt

Itís not the end of the world, but itís annoying. Sometimes the power locks work completely fine, other times they only half work. No matter what, the doors locks always get power when they are supposed to, they just donít always lift/lower the locks all the way. It isnít just when I press the lock/unlock button, when I shift into/out of park itís the same issue. I donít have a key fob so I canít check to see if that would be any different with that. When it happens when unlocking, when I try to open the door it only opens the first latch; I have to unlock it by hand to actually open the door. When locking the doors it just doesnít depress it far enough to lock the doors. Itís not just one door either; sometimes itís enough to lock/unlock one door but not the other. Also, if I put the car in park it unlocks the doors (or at least tries), but if I immediately put it back into a gear (it auto locks it) and then back in park, it always only half unlocks to doors. I think Iíve checked all the fuses and theyíre fine (maybe I missed one?) But since they always get power my thought is that the system just isnít always sending enough power to the doors. Thatís just a guess and have no idea what could cause it. Any ideas? Thanks.
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post #2 of 4 (permalink) Old 12-29-2017, 03:49 PM
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My guess is the 2 blue/grey connectors on the BCM. I never remember which is which so just pull both and spray them with contact cleaner then re-seat them a few times. This should remove any resistance between contacts and send more voltage to the solenoids.

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post #3 of 4 (permalink) Old 01-04-2018, 02:48 PM
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if cleaning the BCM doesn't help, just buy some new Dorman switches on ebay and replace both drivers and passengers side. my daughter has an '08 also, and they were acting the same way as yours...but once replaced, they both work great...there must be something about the way it was electrically engineered that makes the switches fail over time
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post #4 of 4 (permalink) Old 01-07-2018, 05:23 AM
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Did either of the suggestions work for your car locking issue?
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