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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    ☆PROBLEM SOLVED ☆ Wanted to leave the info and post an update for any future guys with the same problems. Basic issue was glowplugs would NOT come on/cycle causing a p0380 code. It turned out to be a bad ground wire on the middle (pnk/blue/ yel-pnk/ yellow )4 pin harness (yellow/pink line...
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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    Lt Blue wire GP signal (Harness to ecu pin 52) .5 ohns Yellow wire gp relay controller (Harness to ecu pin 6) .5 ohms With the middle harness plugged in/ key-on I have: Pink 12v Blue 9.5v Yellow/pink 12v Yellow 12v With the middle harness plugged in/ key-off I have Pink 0v Blue 3v Yellow...
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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    @DAVe3283 Ok thanks! I re-tested this morning just to verify (I may have tested wrong previously) •Key off Harness side of middle plug (unplugged) Pink 0 volts Yellow 0 volts •Key on Harness side middle plug (unplugged) Pink 12volts Yellow 12volts •Key off Harness middle plug (plugged into...
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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    Can you tag members? @DAVe3283 seems very knowledgeable in a post with very similar issues. After finding his wiring diagram and this: CAL EMISSIONS: The 175 Amp Fuse feeds the Glow Plug Controller at M8. And there are two voltages from the Glow Plug Controller (OUTPUTS) that are INPUTS to the...
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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    That was my first test. As said, I have already tested them in and out if the block. They all read at .09 - 1.0 ohms. I also believed they needed to be around .4ohms but a few other fourm post have said they may read higher (around 1ohms) Also i have already tested for 12v at the glowplugs...
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    Help with 03 duramax CA emissions glow plug/controller issue ☆ problem solved☆

    ☆edit: PROBLEM SOLVED, READ LAST POST☆ Hey yall. New to the forums but could use some help with a duramax glow plug issue. I dont see a help forum page, not sure where this goes.. 2003 GMC sierra duramax 6.6 auto California Emissions Working on a customer vehicle. Its having a glow plug issue...
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