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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

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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