They cannot void your warranty over that, maybe for the computer you modified but the Magnuson Moss warranty act means they have to honor the warranty unless they can prove your modifications caused the damage.
Also, who cares if it gets updates? It will continue to work as it did from the factory indefinitely. Security updates aren’t necessary if the car isn’t connected to the internet and those updates cant change how the immobilizer/keys work anyways.
Things can suddenly or progressively break after a while if a system gets too far behind regarding updates.
A few plausible examples:
The navigation system can send you to non-existing road if it doesn’t know about recent major roadworks. Or give you old/bad speed limit and cause you to get a ticket.
The GPS receiver may fail to obtain a location if satellite orbit or other reference data shifted too much since the last update (happened to me once).
A bug may manifest itself only after a while or a given date (similar to y2k) and break some features.
A vulnerability may be discovered, which make cars that aren’t updated easy to steal as knowledge of the vulnerability spread
They cannot void your warranty over that, maybe for the computer you modified but the Magnuson Moss warranty act means they have to honor the warranty unless they can prove your modifications caused the damage.
Also, who cares if it gets updates? It will continue to work as it did from the factory indefinitely. Security updates aren’t necessary if the car isn’t connected to the internet and those updates cant change how the immobilizer/keys work anyways.
Things can suddenly or progressively break after a while if a system gets too far behind regarding updates.
A few plausible examples: