What is the code? Auto Zone uses cheap scanners, but the code is what you need. For example if you get a P1651 OBDII code the sensor that controls the fan relay could be running the cooling fans at night when the car is turned off and running down your battery. For a few bucks your local GM dealer can scan it for you, and you should have the answer. If you just get the code's Write them down, If you don't have a service manual, search the net for OBDII with the code# and that should narrow the problem down to circuit that is causing the problem. Hope this help.
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