Hey how are you
We can try resetting it manually , usually we need GM tech II scanner , but if there is no fault in system and only battery went died it should ,if the master reset did not work we need to scan it with capable scanner that car read cadi anti theft and retrieve fault codes and based on the fault codes we can pull up pin point trouble shoot and be accurate ,so you can post these fault back to me and i can help further in case it did not work
Master reset Procedure
1- Disconnect Battery Cables ( Negative & Positive Cables )you can use any electrical wire as an extension if battery cables don't reach .
2- Hold cables Together for 60 secs ,then let go
3- Wait 30minutes
4- Make sure all doors are closed
5- Reconnect battery Cables
6- Lock & unlock the vehicles using the key from driver door side (if you have a key fob with no blade key, just lock & unlock using the key fob buttons)
7- Enter the vehicle and attempt to start
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