PO674 Code! Whats the problem? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 11 (permalink) Old 01-15-2011, 04:39 PM Thread Starter
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PO674 Code! Whats the problem?

Hello. 2006 GMC Duramax. 76,000 Miles. Just started flashing this code. Anybody have any idea what this could be? never had any issues before. Thanks any help would be good.
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post #2 of 11 (permalink) Old 01-15-2011, 04:40 PM Thread Starter
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forgot to mention P0647 is cylinder 4 glow plug circuit. Thanks!
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post #3 of 11 (permalink) Old 01-15-2011, 11:51 PM
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You have a dead glow plug.

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post #4 of 11 (permalink) Old 01-16-2011, 01:59 AM Thread Starter
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Thanks. Does anybody have instructions on how to remove and change these glow plugs? any help is great...
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post #5 of 11 (permalink) Old 01-16-2011, 10:16 PM
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Its just like changing a spark plug. Easy as pie.

Disconnect the wire lead.
Unscrew the old glow plug.
Install new glow plug.
Reconnect wire lead.

Note to the wise, put a small amount of anti-sieze on the threads when you install the new plug.


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post #6 of 11 (permalink) Old 01-17-2011, 02:09 AM Thread Starter
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thanks!...iv done a set on an old 6.5 sounds to be about the same
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post #7 of 11 (permalink) Old 01-17-2011, 02:11 AM Thread Starter
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i know this may sound like a very stupid question......but which cylinder would be #4
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post #8 of 11 (permalink) Old 01-17-2011, 05:14 AM
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second one back on passenger side.
the cylinder numbers are 1-3-5-7 on drivers and 2-4-6-8 on passenger side, always from the FRONT of the engine

If you take off your pass/side tire and wheel well, you will see the glowplugs and glowplug rail directly in front of you, just undo the small 8mm nut holding the gp rail on, and then gently remove the GP with a 12mm deep socket, and like Robert said, brush a little anti-seize on the threads and you should be golden

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post #9 of 11 (permalink) Old 01-18-2011, 12:34 AM
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Quote:
Originally Posted by duramax456789 View Post
i know this may sound like a very stupid question......but which cylinder would be #4
I can also tell you from experience; when one goes dead, the others are not far behind. My advice to you would be to change them ALL out at one time.


-Robert.

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2003 Chevrolet Silverado LS 6.6L 5A
1997 GMC Suburban SLT 5.7L 4A

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Quote:
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Thinking of buying a Duramax? You need to click this link;

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post #10 of 11 (permalink) Old 01-18-2011, 02:09 PM
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I just had the exact same code. Took 5 mintues to change it.

-Wayne
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