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First time on this forum and I'm hoping someone can help me out.
I have a 2004.5 Chevy 2500HD D/A with 44K miles. I've never had a problem with the truck, I've switched over to all synth fluids, maint done at regular intervals, never an issue. So the other day I went to light her off and the "Wait to start" light never went out. After about 5-6 seconds I started the truck and it took right off (light went out when the truck started). Drove to work and when I left work the same thing happened. So I took it to the Chevy dealership and they kept it over night and checked everything out, no codes, glow plugs good, the whole nine yards. But the light doesn't go out after 2-3 seconds like it used to. The dealer assures me everything is A OK.
Does anyone have any input on this issue? I think the dealership is giving me a song and a dance because they didn't see any codes. Instead of actually troubleshooting the problem like they used to do before computers.

Thanks
 

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Today it was -24¬?C outside or -11.4¬?F, cold enough to make your nose crusty, and my wait to start only comes on 3 seconds on a cold motor.

My Dodge would put me to sleep it took so long but it would go out.
 

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Most likely a Glow Plug Control Module going out. That is one of the signs of problems with them. The lights are designed to go out when the truck starts, however the glow plugs can stay on for up to 90 seconds without the light being on.
 

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I have never paid any attention to the wait to start light, I just turn the key, but I live in southern NM, it was 22 this morning. started right up 1st turn. Probably not good practice but,,
 

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my glow plug light stays on 6-10 seconds if its cold but i dont know it may have to do with the new motor, this morning it was like 15 and it took a good while. If temp drops it takes long just wait it out and see how long it takes then maybe the dealership will have something to go by.
 

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my glow plug light stays on 6-10 seconds if its cold but i dont know it may have to do with the new motor, this morning it was like 15 and it took a good while. If temp drops it takes long just wait it out and see how long it takes then maybe the dealership will have something to go by.
I checked both of my 05s this morning, the light only stayed on for a couple of seconds. It was about 32 when they started. It could be that the LBZs use a little more glow plug time as it is my understanding that the compression ratio is a little lower on LBZ than previous models. It could also be that due to new emission laws that they want a "cleaner" start up, by increasing glow plug time, they might have more complete combustion upon start up.

I wonder if someone out there has had a complete glow plug failure on a duramax? and more to the point, if a duramax will even start cold if there were such a failure. I know that once the motor cooled off, my old 6.2 would not hit a lick when the glow plugs would not work, even in the middle of a moderetly warm day. Of course I broke the rules by giving it a little shot of starting fluid, and it would pop right off.
 

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could be, i'm not a mechanic i dont know this morning it was 10 out and i wanted to see if it would start right up with out glow plugs. Opened door turned key to start no waiting....Started right up........................I DON'T KNOW have a good one.
 

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The LLY had this problem on the early models. I got mine in March 2004. Mine worked fine for several months and then for no reason the glow plug light started staying on longer than normal. I checked on a different forum and a fair number of people were having this problem. In fact GM had an advisory regarding this problem. Dealer changed the module associated with the glow plugs and worked fine ever since. I now have 80K miles. Problem occurred during the first 10K miles.
 

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since my truck was new my WTS light has been very slow to turn off but yet i can go out when its below 32f and it will start right up with no problems
 

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I live in Texas and i dont ever see my Glow plug indicator light come on or off. Ill have to check when its colder to see if its working because it never comes on.
 

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Mine is an 03. Do they have a plug to plug in the wall like the powerstrokes??
Yes - look under your auxillary battery box, it's zip tied under there...
 

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Hey guys I know this thread is old but I'm having the same issue right now.. I know my glow plugs are good and I just replaced the whole glow plug module and had it recalibrates by my Chevy dealer.. I have had my truck 3 years and it use to come on for maybe a second or two recently it would stay on longer then go away then come back on..
Now it still does the same thing even with a whole new module.. Any more ideas

Please help!!!!!
 

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No that's not it Lbz s should not take longer than a few seconds for the light to go out
 
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