Yes. It is one of the first steps to resetting your BCM. However, disconnecting the battery will not fix a bad BCM. Disconnecting the battery terminals act as a safety procedure for resetting the BCM. To successfully reset the BCM, you must disconnect the battery, locate the BCM, remove the BCM, reprogram it if necessary, and reinstall the reset BCM. Learn more about if a bad BCM can cause a car not to start.