What do you mean by shoddy wire? Its not your OEM harness? Or is it all jacked up?

 

The one wire that connects to the tip of the glow plug (is that a ground or positive) was spliced into the harness. Im not sure what happened there if they broke the wire or what when they replaced it. You can tell its a brand new black wire connecting the tip though.

 

The module is mounted below the alternator close to the belt tensioner area.

 

would you happen to be able to provide a picture of it? Thank you so much

 

Circled with arrow pointing to it. Yes the wire will be positive volts.

 

You’re too kind! Thank you so much

 

You took your whole engine out just to take a pic for him !? Wadda guy!

 

Sure why not LOL! No i have engines out all the time doing frame changes so just went back in my pics and found one that i could see the GPCM.

 

You may be able to access from fender but it would make a lot nicer to have the pipe loose up top. To get pipe loose you need to rotate the retaining ring counterclockwise a little to pull back the tabs then it should slide off.

 

Would you happen to know which harness I would need to replace that entire wire set? Is it just a glow plug wiring harness or does it connect to the ECM harness

 

That plug has close to 20 wires in it because it communicates with the ECM. The bigger wires are the ones going to the glow plugs and smaller wires are whatever else. I would need wiring diagram to know what does what.

 

Quick question. The small plastic tab on the controller is damn near impossible to remove. I feel like I’m going to break it. Is that normal it’s that difficult? It will move about half way. What am I doing wrong

 

Oh wow. So the wire that attaches to the top of the plug; is it a ground or power?

 

The big wire is a power hooked up directly to fuse panel on top off pass side battery.

 

What about the tiny single wire that attaches to the top of the glow plug itself? Is that a ground or power?

 

That will be power. Ground is the engine itself.

 

Thanks. I was hoping it was a ground so i could just grab another ground in case this harness is jacked. I appreciate all the help. I cant figure out why every couple of days i keep getting this code. just says p0676 open circuit. Engine runs and cranks fine even in 22 degree weather.

 

Like your talking the plug or…?

 

The actual controller. I can get the small round off but the main controller that has the gray plastic tab only moves half way then I’m afraid I’m gonna break it if I pull any more on it.

 

The controller has an aluminum back and is bolted fast. I guess I’m not sure what you are wanting to do.

 

Im trying to remove the wiring harness that connects to the controller to check for any damaged pins or wires to figure out why i keep getting this one code.

 

Ok gotcha. Yes they can be a little sticky sometimes. You are rotating the light grey lever right? There is a slider that come out the top or back side that i use a little screwdriver or something to help it along sometimes.

 

Yes that little grey thing. Its pretty difficult to see from my vantage point so im almost surely not seeing the slider. I thought there may be something else holding it up. Its about 15 degrees outside right now so ill wait a little later to tinker with it lol. Also, if i do replace that controller, do i HAVE to have it programmed for flow rates?

 

Here are some pictures that will hopefully help you

 

That helps so much. Youre awesome. I owe you a few beers

 

221117 I dropped my 2018 2500 HD for the eng light on the glow plug error on #6 too. The service department informed me yesterday, that it was not the glow plug but a software update that was needed to fix the issue. 221122 I'm scheduled to pick it up tomorrow, but they are telling me that fixed the issue. The upgrade cost me $150; that's all I know for now.