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Ask Michael Moore Your Own Question

Michael Moore
Michael Moore, GM MASTER/WORLD CLASS. ASE MASTER
Category: Chevy
Satisfied Customers: 2867
Experience:  ASE Master/GM WORLD CLASS/GM Master/GM ASEP/Dodge Gold/Mazda cert.
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The glo plug relay for my 2002 Duramax none cailfornia

Resolved Question:

Can you tell me where and how to change the glo plug relay for my 2002 Duramax none cailfornia?
Submitted: 3 years ago.
Category: Chevy
Expert:  Michael Moore replied 3 years ago.
The glow plug relay is located on the back of the engine near the firewall on the drivers side of the engine. Its held on with 2 bolts and has a few wire connectors going to it. Its best to remove both battery neg cables before replacing this relay. One of the wires going to the relay is always hot and can short out if the battery is connected.
Customer: replied 3 years ago.

I am not sure if it is the relay or the glow plugs? Do you picture of the relay and also the price? Thank you

 

Expert:  Michael Moore replied 3 years ago.

The glow plug relay runs around $160. Its shown below, its the square box.

What is the problem that you have?

 

Object Number:(NNN) NNN-NNNN Size: SH

Customer: replied 3 years ago.
The problem I have is the service engine light. Code p0380
Expert:  Michael Moore replied 3 years ago.

How many miles on the truck?

 

Do you know if it has California emissions?

Customer: replied 3 years ago.
120000 no california truck
Expert:  Michael Moore replied 3 years ago.

Inside of the glove box is a silver label with some codes on it. Check and see if it has one of these codes. This can make on how the truck is fixed.

 

 

yf5 ne1 or vcl

Customer: replied 3 years ago.
what do those tell us? if it has smog pump or erg?
Expert:  Michael Moore replied 3 years ago.
There are 2 kinds of glow plug relays and wiring, this will tell me which one you have.
Customer: replied 3 years ago.
did not see any of those
Expert:  Michael Moore replied 3 years ago.

There is a large red wire going to the glow plug relay, make sure this wire has power to it all the time. Its best to use a test lamp. If there is power then check at the wires going to the glow plugs, this is a large wire as well and should be blue. Have some one turn the key on and this wire should have power for a second or two. If there is no power, then the relay is bad.

 

 


Object Number: 775449  Size: FS

 

Customer: replied 3 years ago.
im not really able to follow the wiring. it is not my strong suit
Expert:  Michael Moore replied 3 years ago.
Thats OK, just check the wires if you can. Large red wire should be hot all the time, you can check at the glow plugs and see if they get power when the key is first turned on. They should get power for a second or 2. Use a test light, one side connected to engine ground.
Customer: replied 3 years ago.
ok what is the part number? and are glow plugs under valve covers?
Expert:  Michael Moore replied 3 years ago.

I do not have a part number, this part should be looked up at the dealership with your VIN number to ensure you get the correct part.

The glow plugs are located just below (not under) the valve covers. You will see a large metal strip along the bottom area of the valve covers. This metal strip connects to the glow plugs. There is one for each cylinder.

Customer: replied 3 years ago.

what do you mean by metal strip under valve cover?

 

Expert:  Michael Moore replied 3 years ago.
Its not under the valve covers, but below them just above the exhaust manifold. The glow plugs are connected to each other with a long metal strip instead of a wire.
Customer: replied 3 years ago.

how much dealer charge to replace glow plugs and relay?

 

Expert:  Michael Moore replied 3 years ago.
The glow plugs will not set a p0380 unless your truck has the codes I asked you to check before. The only parts on this truck that will set the p0380 is the relay, engine computer or a bad wire somewhere. The dealer will charge around $300 parts and labor.
Customer: replied 3 years ago.
ok thank you for your help. so my best bet would be to replace the relay?
Expert:  Michael Moore replied 3 years ago.
Yes, I have had this issue a few times and each time it was the relay.
Customer: replied 3 years ago.
ok thank you for the help
Expert:  Michael Moore replied 3 years ago.
Glad to help.
Michael Moore, GM MASTER/WORLD CLASS. ASE MASTER
Category: Chevy
Satisfied Customers: 2867
Experience: ASE Master/GM WORLD CLASS/GM Master/GM ASEP/Dodge Gold/Mazda cert.
Michael Moore and 6 other Chevy Specialists are ready to help you

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