Duramax Diesels Forum Truck of the Week
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Old 10-12-2017, 08:46 AM
2012 DMAX 2012 DMAX is offline
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Default What's involved in changing #4 Glow Plug ?

Recently, two days into our vacation my check engine light comes on. All guages and fluids check normal. We are in the middle of nowhere in Arizona but luckily we find an Auto Zone that is close. They scan the truck and get a code for #4 glow plug. So the rest of the trip I plug in the engine heater at night and all is good.

Now that we are back home, how difficult is changing this glow plug ? Do I need to remove the inner fenders and work through the wheel wells ? The part was only $12 and change.

BTW... which is the #4 cylinder on a Duramax ? 2012 Chevy 2500 Silverado 4x4
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Old 10-12-2017, 08:53 AM
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if you bought an autozone plug, take it back and buy a factory plug. they last much longer than those junk cheap ones.

cyl 4 is second cyl back from the front of the engine on the driver side. i would remove teh inner fender to change it. it will make it easier. pulling the tire will help too.

dont fret over a bad glow plug. the truck will start just fine even in cold cold weather with one bad plug.
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Old 10-12-2017, 03:43 PM
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A little tip for changing glow plugs, do it with the engine warm.
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Old 10-12-2017, 04:41 PM
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I jus pull the intercooler tube and you'll prolly have to take the steering shaft loose. Go from the top. 30-45 min job
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Old 10-12-2017, 05:09 PM
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If it’s rusted bad there’s an air hammer attachment that works well. I second doing it with a warm engine


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Old 10-12-2017, 07:56 PM
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$12 seems really cheap. The stealership charges quite a bit more for oem. There's also a chance that more will go out in the near future if they are all original or changed at the same time.
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Old 10-13-2017, 04:30 AM
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If you don’t want to mess with it take it to the dealer and have them replace it under warranty. There is an extended service on this for the 11-12 LML’s

15114 - Special Coverage Adjustment - MIL Lamp On / Glow Plug Heater Inoperative

If not the part number for the glow plugs is 12639701


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Old 10-13-2017, 04:37 AM
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Coming from experience I would do the whole side while your in there.
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Old 10-13-2017, 06:18 AM
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Quote:
Originally Posted by lutzjk913 View Post
Coming from experience I would do the whole side while your in there.
All 8 and just be done with it. My brother did 1 and then another popped up so he did that one then another popped up so he did the other 6. Just do them all.
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Old 10-13-2017, 06:53 AM
2012 DMAX 2012 DMAX is offline
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Quote:
Originally Posted by FC5452 View Post
If you don’t want to mess with it take it to the dealer and have them replace it under warranty. There is an extended service on this for the 11-12 LML’s

15114 - Special Coverage Adjustment - MIL Lamp On / Glow Plug Heater Inoperative

If not the part number for the glow plugs is 12639701


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Thanks everyone for your input. My 2012 truck just hit 50k miles on this trip. Is it still covered under the extended warranty for this ?
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Old 10-13-2017, 06:55 AM
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Quote:
Originally Posted by 2012 DMAX View Post
Thanks everyone for your input. My 2012 truck just hit 50k miles on this trip. Is it still covered under the extended warranty for this ?


10 years or 120,000 miles


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Old 10-13-2017, 08:10 AM
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Quote:
Originally Posted by FC5452 View Post
10 years or 120,000 miles


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Good info thanks
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Old 10-14-2017, 01:48 PM
2012 DMAX 2012 DMAX is offline
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Quote:
Originally Posted by FC5452 View Post
10 years or 120,000 miles


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That's excellent news. Thank you !
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Old 10-14-2017, 02:25 PM
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Welcome


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Old 10-14-2017, 04:40 PM
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Depends on what your time is worth. It wasn’t worth it for me to waste time going to the dealer, get a loaner, go back to the dealer, etc for a $18 part and a couple hours of time. I would have wasted a lot more than that driving around during work hours. Changed the plug myself on the weekend. It’s all relative.
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