CEL Code Help
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
CEL Code Help
I bought a truck a few days ago. The owner said the CEL comes on sometimes, but I havnt seen it on yet. I've driven about 500 miles in it since I bought it. Out of curiosity I plugged in my code reader and pulled these two codes:
P0670
P0683
Can anyone help explain, diagnose, and help me fix this?
P0670
P0683
Can anyone help explain, diagnose, and help me fix this?
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
Those are GPCM codes, so the fact you live in California that is a system specific to Excursions and Cali trucks.
It could be as simple as a loose connector, but more than likely a bad GPCM.
Take a look at this GPCM troubleshooting manual
It could be as simple as a loose connector, but more than likely a bad GPCM.
Take a look at this GPCM troubleshooting manual
Thread Starter
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
Those are GPCM codes, so the fact you live in California that is a system specific to Excursions and Cali trucks.
It could be as simple as a loose connector, but more than likely a bad GPCM.
Take a look at this GPCM troubleshooting manual
It could be as simple as a loose connector, but more than likely a bad GPCM.
Take a look at this GPCM troubleshooting manual
Thread Starter
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
Ok, I'll look for one. Any suggestions?
Super Moderator
Joined: May 2004
Posts: 29,380
Likes: 118
From: Central Coast of CA
Online junk yards or ebay.
The GPCM is the same one used on the 6.0's so don't limit your search.
I have a used one from a 6.0 in my truck right now because mine failed last year.
The dealership will rape you on these. It takes all of 15 to 20 minutes to unbolt, unplug, remove, and install the new one.
Stewart
The GPCM is the same one used on the 6.0's so don't limit your search.
I have a used one from a 6.0 in my truck right now because mine failed last year.
The dealership will rape you on these. It takes all of 15 to 20 minutes to unbolt, unplug, remove, and install the new one.
Stewart
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
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From: Missouri
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Super Moderator
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9 ECHO 1
Joined: Aug 2009
Posts: 12,467
Likes: 58
From: Missouri
The truck is still lighting up the CEL every few days. I havent replaced the GPCM yet, but it stopped throwing the P0670 code and now is only showing P0683. Does anyone know exactly what P0683 means?
Posting Guru
Joined: Jul 2008
Posts: 1,302
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From: Morehead, Ky.
Cargo Master
Joined: May 2010
Posts: 3,047
Likes: 9
From: Snohomish, WA
P0683 is GPCM glow plug control module communication line failure. It is explained in the link I provided in the second post.
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red85k100rs
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Mar 12, 2013 02:23 PM
