P0380?

[RENODMAX]

Just getting this at startup. Ideas? Hoping I didnt pop the big gp Fuse whilst fiddling

 

[Alligator]

Glow Plug control module code. I bet you have a glow plug that is bad, I got GM to replace mine at 55K under the emissions warranty on my 03.

 

[RENODMAX]

I hope not. F glow plugs it didn't snow that much today

 

[Alligator]

It was never a problem, just the light pissed me off and I figured if they would pay to change it, that was fine with me. I had a Intake, Kennedy boost valve, 4" turbo back, gauges on the pillar and a SCIV at the time when the truck was in. They didn't say a word.

 

[sweetdiesel]

So how do we test them

test light on the glowplug

 

[2500HeavyDuty]

i think henry can pull up the steps to diagnose the p0380 with his super powers :hug:

 

[The Neens]

Emissions warranty yeah???

200,000 miles...

 

[2500HeavyDuty]

Emissions warranty yeah???

200,000 miles...

really?

so this could be dealer fixed?

 

[RKTMech]

So how do we test them

test light on the glowplug

Glow plugs are the biggest cause of p0380's

Yep, You can go to the tip of each glow plug individually with a test light connected to 12volts, or pull the right and left outer most plugs on the glow plug module and test each circuit white wires are driver side and red wires are pass side. this is for california spec truck, You will have to check at each glow plug for 49 stater.

 

[2500HeavyDuty]

i have the gm service manuals, i can look up how to diagnose the problem... but im too lazy to go to the garage

 

[sweetdiesel]

Glow plugs are the biggest cause of p0380's

Yep, You can go to the tip of each glow plug individually with a test light connected to 12volts, or pull the right and left outer most plugs on the glow plug module and test each circuit white wires are driver side and red wires are pass side. this is for california spec truck, You will have to check at each glow plug for 49 stater.

Cool thanks Robert

 

[RENODMAX]

Getting it under warranty won't be an issue. I just thinkvi had to have done it while I was rerouting some stuff

 

[SIKDMAX]

Id check all your GP wires then to see if you accidentally nicked one or one loosened up or something.

 

[WanaDmaxsub]

#3 in my sig.

Fed trucks it's usually the controller.
Cal trucks it's usually a glowplug (or 2,3...etc).

 

[RENODMAX]

So it's not getting a MIL everytime. But it's hard to start in the mornin

 

[WanaDmaxsub]

Mil on and off is normal with a P0380. Just believe me...they do not fix themselves
Even with 3 plugs not working my truck never started hard in the morning...but I'm also not in an area that gets very cold.

 

[2500HeavyDuty]

damn mines an 01

 

[Alligator]

So it's not getting a MIL everytime. But it's hard to start in the mornin

Exactly what mine was doing.

 

[RENODMAX]

Mil on and off is normal with a P0380. Just believe me...they do not fix themselves
Even with 3 plugs not working my truck never started hard in the morning...but I'm also not in an area that gets very cold.

I know enough about these trucks to know how MILs work. I do know that if that gpcm arcs it'll blow the 175A fuse and act similar to a bad plug or module. Chad thanks for the info I'm sure it's the same issue you had

 

[slowlmm]

I know enough about these trucks to know how MILs work. I do know that if that gpcm arcs it'll blow the 175A fuse and act similar to a bad plug or module. Chad thanks for the info I'm sure it's the same issue you had

easy dude just pull out each one. one at a time in the morning before you start your truck. leave it coneected stick you toung on the end and turn the key on. If you go screaming into the house it works. put it back in and go to the next one repeat steps.