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I received a masege from all tar and they  said my truck have a code p0724 in transmission gmc sierra denali 2008 what is this. Thanks for the help
Vehicle: 2008 gmc sierra denali 6.2

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Hi there,

This code indicates an issue with the brake switch. Here is some info for you.

P0724 GMC - Brake Switch Circuit High Input

Read more: https://www.autocodes.com/p0724_gmc.html

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