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GMC Yukon Bully Dog Performance Chips

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Latest Customer Reviews

Bully Dog Triple Dog GT Tuner (49-State Legal) Reviews

2003 yokon 5.3

Reviewed By William L (Superior, WI) Reviewed for a 2003 GMC Yukon —9/10/2015 5:58 PM

WoW! I went from 12.5 to 16 in the city, using 91 oct on performance mode, shift points firm. Versus 87 oct in stock. It's how you drive it that matters. The driving coach is way cool. And it's fast too!

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Bully Dog Triple Dog GT Tuner (49-State Legal) Reviews

Regular Tune Caused Diagnostic Errors

Reviewed By Vincent C (Waukegan, IL) Reviewed for a 2007 GMC Yukon —3/10/2011 5:05 AM

The unit was easy to install. The Regular tune download worked for about 100 miles and then caused a pollution control error which would not allow the transmission to shift out of low. I was able to download the OEM tune which corrected the problem but lost any potential fuel savings of the tuner. I have not yet tried the performance tune or higher octane fuel yet. The driving coach did help me save about 1 MPG without the tuning.

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