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Q: COMPUTER PROGRAM on 2003 Chevrolet Avalanche 2500

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
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
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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