Does the Body control module need to be flashed in order for it to work . I put a new one in my 07 Chevy Cobalt.

It isn't going to work! You need the ECM for the engine, and it is likely to open up a whole can of worms for the other existing sensors and modules that are trying to interact with the new ECM.

They are the function of the Body Control Module
Body Control Module (BCM), License Lamps, Marker Lamps

Park/Turn/DRL Signal Lamps, Tail/Stop and Turn Signal Lamps

Chevrolet Cobalt (2005-2010) fuses and relays

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Fuse box diagram - In this article, we consider the first-generation Chevrolet Cobalt, produced from 2004 to 2010. Here you will find fuse box diagrams of ..

07 Doesn't have vats An you can't by pass it , Find out what DTC's are stored in the theft deterrent module . Pass-key 3 is software programmed into the theft - deterrent module , BCM - body control module an the PCM - engine computer . Messing with it can cause more problems then you have know. Have it towed to the dealer . May be something simple .

What kind of body control module problems ??????? Did you have it checked for BCM DTC'S - diagnstic trouble codes ? Or are you assuming the BCM is the problem . Call the chevy dealer ask about if used one can be used ! Some of GM vehicles need new not used . They still need to be programmed .

I think you have a BCM - body control module problem ! The BCM controls the automatic door locks .
Automatic Door Lock Operation
This BCM controlled feature can be personalized to driver preference. Refer to Power Door Systems Connector End Views Personalization Description and Operation in Personalization.
The BCM will automatically lock the vehicle doors if the following conditions exist:
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All vehicles doors are closed.

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The ignition is in the ON position.

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The vehicle is shifted out of PARK.

The BCM will then unlock the doors when the ignition is placed in the OFF position. Do the exterior lights flash as well as the horn sounding ?
Body Control Module (BCM)
The
Content Theft Deterrent
system is an internal function of the Body Control Module (BCM) which utilizes class 2 serial data and various switch input information to perform CTD functions. When the BCM detects an unauthorized entry, it activates the horns and exterior lamps.
When the BCM detects an unauthorized entry, the BCM enters the alarm mode. The BCM activates the horns and exterior lamps for 2 minutes. This is followed by a 3 minute time-out with the horn no longer active. If no new intrusions are detected after the time-out, the horn is not active. The system must be disarmed or the intrusion condition removed after the time-out for the system to exit alarm mode.

remove the plastic cover from the steering colum then you will see the switch on the left side remove the 2 screws you will need to turn the key to release the switch reverse to put together then you will need to relearn the switch to the body control module this is done by turning to crank and leaving it in the run position til the security light stops flashing you will need to do this three time after the third time remove the key for a min then start the car if possible but on a battery charger if the battery goes died during the relearn you will need to start over

It is as simple as your hazzard switch needs to be replaced yes your hazzard switch as now turn signals are built threw the hazzard switch my PT Cruiser had same problem as my s10 replaced hazzard switch fixed the problem

i have a 05 cobalt SS Superchaged and i bought it new and had to warrenty two batteries and i put another battery n about 7 months ago

check the park lamp relay and the body control module for possible causes. the body control module controls both systems.