How to test glow plugs? - Chevy and GMC Duramax Diesel Forum
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Old 10-06-2011, 09:15 PM   eBay Motors  #1 (permalink)
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How to test glow plugs?

hey my truck is throwing a p0380 code... which means a bad glow plug or controller. how is the best way i can test for this? when i fire it up and its cold (like 50* or colder) i have one of my cylinders that has quite a bit higher injector balance rate, but once it warms up, its just like all the others. Is that a sign that possibly my cylinder #1 glow plug is the bad one? or what is the best way to test to see which one(s) need replaced?
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Old 10-06-2011, 10:55 PM   eBay Motors  #2 (permalink)
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as you said, p0380 usually indicates 1 or more bad glow plugs, g/p controller, or the 175 amp fuse. check the glowplugs first. take the rail off of them and get a test light, hook it to the pos side of the battery and touch the tip of each glowplug. if it lights up the glowplug is bad.
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Old 10-07-2011, 07:19 PM   eBay Motors  #3 (permalink)
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What he said^^^^
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Old 10-07-2011, 07:45 PM   eBay Motors  #4 (permalink)
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great advice! Thanks
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