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A friend of mine just scanned his 2002 Duramax for the check engine light and came up witha code 380. Any idea's where to start? Chris
 

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check and make sure you have power going to the glow plug controller. if you have power there your glow plug controller is prolly bad
 

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But wouldn't that cause a cold star problem? Chris

Depending on your local temp. your intake air heater may assist enough for cool starting..
 
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