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Duramax First Generation: 2001-2004 (LB7) Discuss the first generation (2001-2004 LB7) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.


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Old 03-31-2019, 06:21 PM   #1 (permalink)
chrisorbics
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P0380 where is my glow plug controller?

I just purchased a new to me 2004 Chevy Duramax 2500 HD. I have a p0380 glow plug controller code and cannot find a glow plug controller. Not sure if I have an lb7 or an LLY engine although a VIN decoder says lb7 still not positive. Either way looks like the glow plug controller is supposed to be the same. I ordered a new relay that goes in the glow plug controller but they're supposed to be two inside and the only box I could find that had a similar relay was a single relay box. I took a few pictures let me know what you think. The lb7 glow plug controller with two relays is supposed to be alongside the turbo but more towards the driver side but I don't see anything like that on mine.

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2004 Chevy Duramax 2500 HD LB7
Cali emissions
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Old 03-31-2019, 11:25 PM   #2 (permalink)
dk2429
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8th digit of VIN....

1- LB7
2- LLY

Looks like an LB7 to me

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Old 04-01-2019, 08:08 AM   #3 (permalink)
Rvn4me
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Your first & third picture against the fire wall.
Looks like you have a California Emissions controller.
https://www.dieselplace.com/forum/63...-question.html
https://dmaxstore.com/products/?rout...roduct_id=1062
https://dmaxstore.com/products/?route=account/voucher
More info
https://www.dieselplace.com/forum/63...lug-relay.html
https://www.dieselplace.com/forum/63...g-picture.html
https://www.dieselplace.com/forum/63...lfunction.html
One relay is over $112
This is for a Federal Emissions
You can buy the controller+ both relays for $110
GM Part :97371491, CONTROLLER, Voltage and Glow Plug, CONTROLLER,GLOW PLUG(INCLUDES GLOW PLUG RELAY AND INTAKE HEATER RELAY)(INCLUDES 18) $110.70
The CALI controller is basically 8 relays in one whereas the federal controller is 2 relays only one being for the glow plugs and the other for the intake heater(the CALI trucks use a remote intake heater relay). You hardly ever hear of a CALI controller failing, but federal ones lose relays after a few years.
Google (duramax LB7 glow plug controler P0308) and (duramax LB7 glow plug controler) lots of YouTube videos, pictures, etc...

Last edited by Rvn4me; 04-01-2019 at 08:35 AM.
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Old 04-01-2019, 07:17 PM   #4 (permalink)
chrisorbics
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Okay so I have the California emissions glow plug controller. So if they don't fail very often and maybe I should shift my attention to testing the glow plugs individually.
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Old 04-02-2019, 06:39 AM   #5 (permalink)
Rvn4me
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Quote:
Originally Posted by chrisorbics View Post
Okay so I have the California emissions glow plug controller. So if they don't fail very often and maybe I should shift my attention to testing the glow plugs individually.
RPO in glove box.
FE9 is Federal Emissions
NE1 is Northeast Emissions this covers NY, VT, MA, or ME
YF5 is California Emissions
VCL is a CFF (Clean Fuel Fleet) designation required to qualify for certain tax incentives

The GPR on the CA model feeds current to each glow plug individually so a bad glow plug can give you a P0380. I would check the glow plugs first before you invest in the GPR.

Last edited by Rvn4me; 04-02-2019 at 06:53 AM.
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Old 04-02-2019, 01:18 PM   #6 (permalink)
chrisorbics
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Okay so I pulled the three connectors on the top of the glow plug controller and use a test light on each of the pins in the two 4-pin connectors only one lit up. This truck starts with no problems in the cold so I'm going to pull the inner fender well on each side and remove the harness and check the glow plugs directly because I can't imagine that only one is working
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Old 04-02-2019, 11:59 PM   #7 (permalink)
dk2429
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Quote:
Originally Posted by chrisorbics View Post
Okay so I pulled the three connectors on the top of the glow plug controller and use a test light on each of the pins in the two 4-pin connectors only one lit up. This truck starts with no problems in the cold so I'm going to pull the inner fender well on each side and remove the harness and check the glow plugs directly because I can't imagine that only one is working
Testing glow plugs are easy.. Get you an ohm meter...

Put positive battery cable on positive battery post.. Touch the negative cable on each glow plug. If I remember correctly, each glow plug should be reading UNDER 1 ohm. If it's over 1 ohm, it's bad.
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Old 04-05-2019, 11:57 AM   #8 (permalink)
chrisorbics
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8 digit is a one so it is an lb7. I had the truck on the lift at the shop yesterday and pulled the inner Fender Wells and check the glow plugs with the test light and to my surprise my original testing was correct and only one glow plug on the passenger side was working. The reason I can't believe this is because the truck started perfectly fine even in 30 degree weather. So I put in new AC Delco glow plugs and deleted the check engine light just came back on but it is probably only for the EGR I'm assuming. Will post back after I hook up the scanner
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Old 04-07-2019, 10:34 AM   #9 (permalink)
chrisorbics
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I used a test light to test the glow plugs. They are working great.

I'm down to just one code. P0404 for egr. The vacuum pump has been removed. I do not want to look at the check engine light. I'm in new jersey so diesel 2007 and older do not go through inspection. I would like to program out the egr if it is cost effective. The are pump and new longer belt will cost about $100 but the egr could still have further issues and will be another system to fail.

What is the most economical way to program out the egr or trick it with a resistor if possible?
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