Conditions for Setting the DTC
WARNING: This page is about a different car, the 2018 Buick Regal TourX and 2018 Buick Regal. However, it is still accessible from the selected car via links, so may be relevant.
B2476 04
The telematics communication interface control module detects a short to voltage or an open/high resistance on the keypad 10 V reference circuit.
B2482 and B2476 59
The telematics communication interface control module detects a valid signal on the keypad signal circuit for longer than 15 s. If one of the OnStar® buttons is held or stuck for 15 s or greater, the telematics communication interface control module will set this DTC.