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Old 01-27-2013, 12:15 PM   #1 (permalink)
kentuckynet
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2008 GMC sierra HD codes p0673 p0674 p0678

Trucks runs fine, engine light and codes
codes p0673 p0674 p0678

need i do anything? Runs and drives fine.

If so from my reading a glow plug issue?
Is this common with this truck?

thanks
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Old 01-28-2013, 01:13 PM   #2 (permalink)
kentuckynet
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Help Please

Hello can anyone help?
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Old 01-28-2013, 01:25 PM   #3 (permalink)
mikefos
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Those are glow plug codes. I've had two replaced on mine, one a couple of times. Also had the glow plug module replaced because even when the dealer replaced (under warranty) the same one a couple of times, they replaced the module. When I asked if this was common of the service mgr., he said no, but I think otherwise.

Mike
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Old 01-28-2013, 01:32 PM   #4 (permalink)
kentuckynet
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Which glow plug is where?
#1 #2 etc?

thanks
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Old 01-28-2013, 07:28 PM   #5 (permalink)
alvareracing
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1, 3, 5, and 7 are on the passenger side. 2, 4, 6, and 8 are on the drivers side. Total opposite from a regular GM V8 gasser.
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Old 01-28-2013, 07:40 PM   #6 (permalink)
corvettekent
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I had #4 replaced a few months ago. The next time one goes I'll be replacing in myself.
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Old 01-28-2013, 08:01 PM   #7 (permalink)
Kappa9012
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it's pretty easy, you can find the glow plugs for roughly 15-20 depending on where you get them from.

fyi to check them you can take an ohm meter and put one lead on the pin of the glow plug and the other on the block. usually the resistance is less than 1 ohm. if the glow plug is bad it will have a much higher ohm reading. I do this just to make sure I have the right cylinder. yes I've replaced the wrong glow plug before....
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Old 01-28-2013, 11:00 PM   #8 (permalink)
kentuckynet
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Thank you!
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Old 01-29-2013, 06:29 PM   #9 (permalink)
kentuckynet
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Should i be seeing a problem with my truck?
Like i said it runs and drives fine.....
Is this something that needs fixing?
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Old 01-29-2013, 07:50 PM   #10 (permalink)
GDD
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If it is just glow plugs being out you wouldn't notice any difference at all in engine operation. Only when starting the engine in really cold weather would you see the effects of the glow plugs being bad. How many miles are on your truck? With low miles it would be unusual to have 3 plugs go bad. Dealers in my area cover glow plugs under the 100k warranty. I changed out one myself before I knew about the warranty coverage. Wasn't bad & only spent $15.
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