Posted on Jan 05, 2009

I have powerdowns in my 2003 Yukon Denali at various times.

I thought these powerdowns were through affter I did a tune up with plugs,wires, and injector cleaning. Various codes come up on the OBD tool that Auto zone prints out. Can it just be a software update to the master computer like one service advisor at a GMC dealer has advised me.?

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Anonymous

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Posted on Jan 16, 2009

Anonymous

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Joined: Jan 16, 2009

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THE PROBLEM IS IN THE THROTTLE BODY UNIT OR WIRING HARNESS PLUG

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I own a 2003 yukon denali and i am getting p0300 code which reads random misfire i changed wires and plugs any solutions

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