Glow plugs keep failing - Chevy and GMC Duramax Diesel Forum
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post #1 of 11 (permalink) Old 10-23-2014, 02:35 PM Thread Starter
 
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Glow plugs keep failing

Hello all. Thanks in advance for any replies.

I have a 2006 2500HD LBZ motor. I had to let my wife drive it about a month ago unfortunately. Of course when I get back into it the check engine light is on. I have an edge tuner, so I pull up P0675 glow plug number 5. No big deal, I have extras, get home and swap it out. Truck works fine for following two days, then I go to start it, and glow plug light won't shut off. I wait prob 5-10 seconds and check engine light flashes and comes back on. Pull up the code and once again P0675. My first thought is the glowplug had been sitting for years, maybe it had just got banged around in my tool box. I order a set of new ones. Before they get here, and while I was still driving the truck, I pulled the code again one day and I am getting P0678 now too. New glowplugs come, I swap out number 5 and 8. Truck cooled off for a few hours and I went out to test it. Light shut off like normal and started right up. Works fine for a few days, then another cold start, glow plug light doesn't shut off. Engine light on and code is saying p0675 and p0678 again. Obviously something is causing them too fail. Where do I start? follow the glowplug wires to the relay and replace those? Where and how do I check the controlling unit for the glowplugs? Thanks again.

Oh and each time I swapped them, the bad ones had max resistance reading on the ohm meter. New ones had .8-.9.

Last edited by KA4993; 10-23-2014 at 02:42 PM.
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post #2 of 11 (permalink) Old 10-23-2014, 04:31 PM
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Sounds more like the glow plug controller. I do not know how to test the unit.


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post #3 of 11 (permalink) Old 10-23-2014, 06:21 PM
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My LBZ was eating Glow Plugs too for a while. Turned out to be a bad battery. I have no idea why it would matter? A friend of mine is a tech and figured it out. Swapped in 2 new batts and it stopped throwing the code...even with the old GP still in it!

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post #4 of 11 (permalink) Old 11-25-2014, 08:46 AM Thread Starter
 
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Thanks for replying gents. Just finally getting time to dive into this ghost problem again. I will test the batteries and see what that brings since it is the easiest to test.
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post #5 of 11 (permalink) Old 11-25-2014, 09:59 AM
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Test them separately as one bad one can be disguised by a good one, and if one tests bad, replace them both, good luck.

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post #6 of 11 (permalink) Old 11-25-2014, 02:42 PM
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gm also has a tsb/recall for a reflash for lbz's for repated glow plug failure. basically the original programming is too harsh on the glow plug system.

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post #7 of 11 (permalink) Old 05-29-2015, 08:36 AM Thread Starter
 
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Long overdue update. I swapped two brand new batteries into the truck and saw no change with DTC codes, P0675 and P0678. I purchased a new glowplug control module from DMAXstore.com. Installed it and cleared the codes. They instantly came right back and now I have a new P160c engine calibration code. I'll be swapping back to the old one since that obviously isnt it. Any other tips?
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post #8 of 11 (permalink) Old 05-31-2015, 03:58 AM
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I had this problem as well.You need to use Genuine AC Delco glow plugs since the resistance of some aftermarket GPs might be different which will cause the code to come back.If you absolutely want to use aftermarket glow plugs you will need to switch ALL 8 to avoid the CEL.

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post #9 of 11 (permalink) Old 06-01-2015, 11:02 AM Thread Starter
 
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Quote:
Originally Posted by poosniffer View Post
I had this problem as well.You need to use Genuine AC Delco glow plugs since the resistance of some aftermarket GPs might be different which will cause the code to come back.If you absolutely want to use aftermarket glow plugs you will need to switch ALL 8 to avoid the CEL.
You my friend are a life saver. Thought I was going nuts when I checked the "bad" aftermarket glowplug and the resistance was showing the plug was good. Swapped 2 AC Delco 9g in there hoping they wouldn't conflict with the 61g plugs and they dont seem to be. Thanks for the help.
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post #10 of 11 (permalink) Old 06-01-2015, 11:53 AM Thread Starter
 
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And I now have a slightly used control module for sale. Purchased, plugged in, found out it wasn't the problem, and taken back out. Purchased from DMAXstore.com. PM me if interested.

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Last edited by KA4993; 06-01-2015 at 11:55 AM.
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