GM has issued a broad service update aimed at resolving persistent telematics issues in a variety of recent vehicles. The action, labeled N262547330, targets dozens of 2024-2026 model year products across the Buick, Cadillac, Chevy and GMC brands. Rather than conducting an official recall, the company classified the action as a service update, meaning dealers will complete repairs during routine visits instead of requiring owners to schedule immediate service.
The condition centers on the Telematics Control Module (TCM), which may “enter an unrecoverable state,” according to a bulletin filed with the National Highway Traffic Safety Administration.NHTSA). In practice, this may interfere with connected services such as OnStar functionality, remote commands, and certain app-based features. The specified fix involves reprogramming the module, although the process is not always easy. GM notes that the system “may be several software versions behind and require several programming events to bring it up to the latest software level.”
The update applies to high-end vehicles, including the Cadillac Lyriq, Chevy Silverado EV, and even the 2026 Corvette. Both internal combustion and electric models are affected, indicating that the problem stems from a shared software architecture, not hardware unique to a single platform. For electric vehicles, GM stipulates that only certified technicians at authorized electric vehicle dealers may perform repairs.
Owners may not need to visit a dealer at all. GM indicated that over-the-air updates may resolve the issue on some vehicles, provided customers have accepted the necessary terms for remote software updates. Others will receive repairs at the time of a scheduled service appointment, consistent with the company’s intent to avoid unnecessary inconvenience.
Dealer guidelines are explicit. Vehicles in inventory with open status must be stored and repaired before delivery. The bulletin states these units “should be stored and not shipped to customers” until the update is complete, underscoring the importance GM places on resolving defects before they are sold.
While GM hasn’t detailed the exact cause, the update coverage suggests a system software issue. For owners experiencing connectivity failures, this service action may provide significant improvement, although some cases will still require full module replacement.
Here’s the complete list of models mentioned in Service Update N262547330:
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