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I had this similar issue with a toyota using factory amp.... The toyota fix was plug factory stereo back in an make sure volume is at 50% before you disconnect factory original deck... if you have the volume low on factory deck when you disconnect it. it sets the input gain low on the factory amp and you cant turn volume up very loud.... Im not sure if GM is the same but its worth a shot if you havent figured it out yet
Sorry, there was a problem. Please try again later.Is your phone volume all the way up? Sounds silly, but this can make a huge difference.
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