2024 at4 no power in truck no start 12V on battery stuck in park OnStar tried to fix over the air didn’t work. dealer picked it up on a flatbed, took the shop ran diagnostics no codes disconnected ground hooked it back up. Everything came back. They seem to think an over the air update failed to complete. So if you have that issue just disconnect the ground cable and reattach
over the air update
- Thread starter AT4PAUL
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