1. You can’t. You can try to reset it. Clear the codes with a scan tool. Turn the key on and leave it on for 10 minutes. Turn the key off for 30 seconds. On for another 10 mins, off for 30 secs. and once more on for 10 mins and then try to start it. Oh yeah, put a jump pack on the battery to keep enough voltage, NOT a charger, can’t be over 13 volts.
    If it still doesn’t start tow it to a GM dealer.

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