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2003 Chevrolet Avalanche 2500 Question: COMPUTER PROGRAM



, San Diego, CA, December 26, 2009, 10:55

Hi there:

How should i know if the previous owner performed a modification on the computer´s program in order to gain gas mileage or to achive some more power ? He instaled big tires on it,

I´ll aprecite your advise, thank´s

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  • Answer #1

    December 26, 2009, 23:44

    Have the software version checked and check it with GM. It should match a very specific version, if not then it has been modified.

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