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Old 12-30-2010, 09:13 PM   #1
kkanuck
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Default Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

I have combed through the site for this specific code, and have read all there is to find on it.

2 months ago, I had codes that identified I had a bad glow plug, which resulted in my changing all 5 Glow Plugs, and doing the MOD with external fuses on the Glow Plug Module.

Now today, I had it throw this code again, P0683.

My DAD computer is charging (battery was dead), so I will test with that soon, but I used the ScanGuage II to give me this code, and I then reset the code, started it and the code did not come back (right away anyways...I have yet to take her on another ride)

This code has the following meaning according to a post by Vic: Glow Plug Control Mod to PCM Comm Circuit.

IS this referring to a wire loom short perhaps? Anyone else ever have the same set of circumstances where change all, and this code reappears?

Cheers for any input...


Happy New Year to All!




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Old 12-31-2010, 10:50 PM   #2
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

That is the same code I have and it's having trouble starting in cold weather.

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Old 01-01-2011, 12:18 AM   #3
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Based on the fault description, I would guess it is the connection shown at the bottom of this page.
Attached Files
File Type: pdf Glow plugs.pdf (71.1 KB, 121 views)
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Old 01-01-2011, 01:23 AM   #4
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Quote:
Originally Posted by mendonsy View Post
Based on the fault description, I would guess it is the connection shown at the bottom of this page.
Thanks for the diagram. but which connection are you referring to?

Cheers,
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Old 01-01-2011, 02:36 AM   #5
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Check this out.

http://www.sprinter-source.com/forum...&highlight=WOW
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Old 01-01-2011, 01:36 PM   #6
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Quote:
Originally Posted by kkanuck View Post
Thanks for the diagram. but which connection are you referring to?

Cheers,
The Black/Red wire from C3 pin 25 of the ECM to C1 pin 2 of the glow plug module.
Also......
Read this post that Vic just put up today.
http://sprinter-source.com/forum/sho...4&postcount=51
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Last edited by mendonsy; 01-01-2011 at 01:40 PM. Reason: added Vic's post
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Old 01-02-2011, 02:04 AM   #7
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Quote:
Originally Posted by kendall69 View Post


Great Story...but I am not in CA, and I already changed 5 glow plugs and did the Mod on the controller with the external fuses. My guess is that one of the solder joints let go, will not know till I pull it all apart again, but that will not be for few weeks.....busy schedule.

But I will report back what I find...

Thanks to all
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Old 01-03-2011, 11:53 PM   #8
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Try disconnecting the engine coolant temp sensor, it's located on the thermostat housing.

I unhooked mine and now my van starts like a champ every time.

It is looking like my 1 year old coolant temp sensor has gone and **** the bed on me.

Let me know if your van starts up better with the coolant temp sensor unplugged.
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Old 01-04-2011, 08:16 AM   #9
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Quote:
Originally Posted by GEARS View Post
Try disconnecting the engine coolant temp sensor, it's located on the thermostat housing.

I unhooked mine and now my van starts like a champ every time.

It is looking like my 1 year old coolant temp sensor has gone and **** the bed on me.

Let me know if your van starts up better with the coolant temp sensor unplugged.


So if I reset the Check Engine light, and disconnect the Thermostat sensor, then try starting her, and if the Check Engine light does not come on within 5 seconds of starting like she's doing now, that is the fault causing the light?

I will check....


Cheers
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Old 09-19-2011, 10:52 PM   #10
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Default Re: Trouble Code: P0683 - Glow Plug Control Mod to PCM Comm Circuit

Just searched this code because of a same problem (2004 2500)-
all glow plugs good, changed to a known good controller- same code thrown.
Did some diagnosing and found an open ground wire to the small plug into the controller-
spliced in a new ground wire to the plug (was not going to chase through that can of worms harness) and waa-laa- no CEL and proper glow plug operation.
I'd guess the ground wire is required for the internal coil to fire in the controller...

Just thought I'd share a happy ending (for me) to a similar thread that had no ending/solution.
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