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Duramax Fifth Generation: 2011-2016 (LML) Discuss the fifth generation (2011-2016) of the 6.6L Duramax diesel engine & associated components. Engine related discussion ONLY.

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Old 12-30-2019, 04:23 PM   #1 (permalink)
tomsws6
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Glow plug replacment

Ok, so I have a check engine light come on and since it was still under warranty I took it into the GMC dealer. Turns out it was, according to them, #8 glow plug was bad. Not a warrantied item and wanted $500 to fix. I said, na , Ill get it. So bought one and just replaced it. Well I disconnected the battery for about 20 min while doing it and figured with any luck the check engine light might reset it self. longshot but hey, if not advanced or autozone will do it. Turns out they dont do that anymore so I asked them to just read the codes to me and it came up with P0678 P16a8 and p0675. According to gm it was just #8 and not #5 or the glow plug control mod. Does anyone know if the control mod code generally shows up in conjunction with the glow plug code? Thanks

2015 denali 2500 with 70k

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2015 denali 2500 LML Duramax 70k miles

Last edited by OkDually; 12-30-2019 at 04:43 PM. Reason: prefix/sig
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Old 12-30-2019, 04:40 PM   #2 (permalink)
Kennedy
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One will become 2 will become 8. Trust me on this. Do all 8 with AC Delco plugs. I did the one, then another coded so I did the entire bank and then one on the opposite side went. It's a current or resistance comparison type thing.

I sure would have thought this would be warranty though.

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Old 12-30-2019, 06:11 PM   #3 (permalink)
tomsws6
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Quote:
Originally Posted by Kennedy View Post
One will become 2 will become 8. Trust me on this. Do all 8 with AC Delco plugs. I did the one, then another coded so I did the entire bank and then one on the opposite side went. It's a current or resistance comparison type thing.

I sure would have thought this would be warranty though.
Nope, they considered it as a sparkplug equivalent. Anyway to reset the check engine light myself without reader?
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Old 12-30-2019, 10:56 PM   #4 (permalink)
redwngr
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I bought my LML new.

Had one glow plug replaced under warranty (2nd or 3rd winter iirc). Never had to replace another.
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Old 12-31-2019, 08:14 AM   #5 (permalink)
tomsws6
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Originally Posted by redwngr View Post
I bought my LML new.

Had one glow plug replaced under warranty (2nd or 3rd winter iirc). Never had to replace another.
Mine has a few more miles on it so its the aftermarket warranty.
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Old 12-31-2019, 04:02 PM   #6 (permalink)
redwngr
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Quote:
Originally Posted by tomsws6 View Post
Mine has a few more miles on it so its the aftermarket warranty.
Signature shows 70,000.

Powertrain is 100,000

Must be more than 5 years in service?
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Old 01-01-2020, 06:38 PM   #7 (permalink)
tomsws6
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Quote:
Originally Posted by redwngr View Post
Signature shows 70,000.

Powertrain is 100,000

Must be more than 5 years in service?
I think April was the anniversary but something I need to find out
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Old 01-02-2020, 09:19 AM   #8 (permalink)
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Quote:
Originally Posted by tomsws6 View Post
Nope, they considered it as a sparkplug equivalent. Anyway to reset the check engine light myself without reader?

Search on Amazon, I have the basic model and it read's & resets/clears codes.

"Autel MS309 Classic Enhanced Universal OBD II"
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Old 01-02-2020, 11:36 AM   #9 (permalink)
Dmax Dually
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All my glow plugs have been replaced under warrenty as they went bad. One would go bad. I would bring it in and have it replaced then in a few weeks another one would go bad. I would bring it back and have it replaced. I did this until all were replaced. It was APITA to keep going back..
Don't believe the dealer when they tell you something isn't under warranty.
Because of a known issue with the glow plugs on the 2012's GM extended the warranty on them to 10 years/ 120,000 miles...
The dealer tried to tell me mine weren't covered. Then I made them look it up and they saw that they were.
This has happened to me on several occasions where I had to argue with the dealer.

GM has extended the warranty to 10 years/ 120,000 on the 2012's for:

Glow Plugs- Mine were replaced
Indirect fuel injector ( 9th injector in the exhaust)- Mine was replaced
DEF tank and components- My tank was replaced.
Engine exhaust pipe for diesel smell during region.
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Old 01-02-2020, 03:49 PM   #10 (permalink)
redwngr
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OP's should be covered on the original factory warranty, since the truck is under 100k and under 5 yrs.

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