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Discussion Starter #1
I have a 2008 GMC with a Bully Dog triple power pup. While pulling my Toyhauler this weekend I had a trouble code come up. The engine light came on and said reducing power. The DIC said exhaust filter had problems, see owners manual. The Bully Dog said mass or volume airflow circiut range/performance P0101.
I set the truck back to stock, and clear the message. The code never came back on again.
Have any of you had this problem?

PD
 

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Oh...... Squirrel!
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Discussion Starter #3
I have been running in Tow/Economy.
 
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