Cadillac DeVille intermittent theft messages with codes B2750 and B2780, possible instrument cluster issue on Cadillac DeVille

Some Cadillac DeVille owners report experiencing intermittent theft messages accompanied by fault codes B2750 and B2780, which may indicate issues with the theft system. These owners find that reprogramming the instrument panel cluster (IPC) using a TECH2 tool may be necessary to resolve certain problems, even though the IPC itself might not directly cause security issues. Additionally, some report that theft system messages can appear without the IPC displaying these specific codes, as other codes like U1255 can also trigger such alerts. It's advised that owners verify the complete programming of the vehicle's computer and check for trouble codes and communication issues, particularly related to the body control module (BCM) or wiring in the anti-theft system. Moreover, if the B2750 code is present without accompanying codes like U1016 or P1604, changes made to the IPC by a dealer could potentially impact the system, such as altering the password after a lock cylinder change. These complexities underscore the need for thorough diagnostics to effectively address and resolve the underlying causes of theft message issues in the Cadillac DeVille.