GPCM

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Feb 2, 2013 | 09:52 AM

Iaff113

Thread Starter

Laughing Gas

Joined: Oct 2012

Posts: 1,202

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From: Frederick MD

GPCM

Well my truck was throwing 6 glow plug codes, replaced the GPCM and its still throwing them, should I just go buy a new harness, or is their something else to look at?

Feb 2, 2013 | 10:11 AM

PowerItUp

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Joined: Jun 2006

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I'd do some testing first before throwing parts. Here is a great write up to test the glow plugs and circuits.

glow plug ? - TheDieselGarage.com

I had a #8 glow plug code which usually means GPCM. And that's what it turned out to be. Just one pin on the GPCM was bad and not sending a signal to #8. So do some testing and it maybe as cheap and easy as some new glow plugs.

Feb 2, 2013 | 01:47 PM

BLADE35

Hotshot

Joined: Apr 2010

Posts: 19,066

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From: Saratoga Springs,UT

BISMIC did a Good writeup there Nice Job Mark

Yes get an DVM and check things out

That Guy asked 1 more ??and Never came Back wonder how it turned out

Feb 2, 2013 | 02:18 PM

BLADE35

Hotshot

Joined: Apr 2010

Posts: 19,066

Likes: 240

From: Saratoga Springs,UT

For PCM Comunication to GPCM

the PCM Pins was on the (green plug) 0 pins#s 8 & 9 at the GPCM End

and at PCM End Pin#s 3 & 17

Feb 3, 2013 | 06:38 AM

Iaff113

Thread Starter

Laughing Gas

Joined: Oct 2012

Posts: 1,202

Likes: 1

From: Frederick MD

ok ill take a look and see what I can come up with

Feb 3, 2013 | 09:41 AM

LionFan

Senior User

Joined: Feb 2007

Posts: 228

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From: Saskatchewan, Canada

Mines throwing the #8 glow plug code and it won't clear. If it is just the plug, shouldn't the code clear after the PCM turns off the glow plugs?

Feb 3, 2013 | 10:06 AM

ChrisAU

Senior User

Joined: Jan 2013

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I had P0670 and P0676. Replaced glow plug #6 yesterday, and P0676 went away after I cleared codes. After next crank P0670 was back. I've checked connections and looked for wire chafing, I suppose I need to replace the GPCM.