Code Reader Podcast: P0300
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Code Reader Podcast: P0300

A Technical Service Bulletin identifies an unusual cause for a common code.

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From a General Motors service bulletin, this TSB is in regards to P0300 along with a cold-start misfire or rough idle, which affects vehicles that primarily have the 3.0- or 3.6-liter engine, as old as 2009 and up through 2018, and also a 2.8 liter thrown in the mix.

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Upon inspection, the technician will find medium to high misfire counts and the symptom always occurs on one or two cylinders and goes away when the engine warms up. Now, a misfire or rough idle isn’t that uncommon in the grand scheme of things, but in this case it’s what’s causing them that’s unusual.

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