Doors unlocking and locking

It has been reported that an issue exists that will cause the door locks to cycle when driving and/or become inoperative from the door lock switches. When the condition is present the door locks are inoperative from the switches, however they work normally with the key fobs. (If equipped with Remote key-less Entry). It is recommended that you connect the Tech-2 to the vehicle and look at the door lock switch status (RFA data-list) it should be reading "Idle". If it reads lock or unlock then check for a possible sticking door lock switch and replace as necessary. Follow this first.

The tech 2 is a scan tool that is used at the GM dealer to scan for codes and see important data. You need the tech 2 to see which door lock switch is stuck. You do not have to buy a remote, the remote is not the problem. You might have to go to the dealer and have it diagnosed.

Your problem sounds like it could be a big or little problem (great right?). The little problem would be like a loose or corroded battery terminal. For that fix. Here is a guide to help you:

https://www.2carpros.com/articles/everything-goes-dead-when-engine-is-cranked

If that checks out the BCM controls the items you have mentioned which makes me think the BCM is going bad.

Here is its location (below) you will need a shop or dealer to program it for you.

Check out the diagrams (below).

Please let us know what happens.

Cheers, Ken

Does all your door look buttons work in the car? Most likely caused by a faulty switch.

Common problem with these Cobalt's. Likely a problem with the Body Control Module. What I suggest you do first is take the remotes more than 300 ft away from the car. See if the issue stops. If not then is the BCM.

Could try this, Power Door Locks Cycling Or Inoperative From The Switches

Models: 2005-2008 Chevrolet Cobalt

2005-2006 Pontiac Pursuit

2007-2008 Pontiac G5 It has been reported that an issue exists that will cause the door locks to cycle when driving and/or become inoperative from the door lock switches. When the condition is present the door locks are inoperative from the switches, however they work normally with the key fobs. (If equipped with Remote keyless Entry)It is recommended that you connect the Tech-2 to the vehicle and look at the door lock switch status (RFA data-list) it should be reading "Idle". If it reads lock or unlock then check for a possible sticking door lock switch and replace as necessary. Also found corrosion at the power window switch on these vehicles.

Probably a faulty body control module, a scan may show up a fault code.