P0676 after PCM removal + p0683 GPCM
#1
P0676 after PCM removal + p0683 GPCM
appears the problem was GPCM failure, installed new GPCM
so I got a TS chip, tried to install, truck would not start. Figured it was the wrong PCM code. Anyway, took the TS out, re installed the PCM. Then check engine light came on. Code P0676. Truck then shut off. WTF is going on ? Is it possible the PCM is not seated ? Or is it the glow plug controller?
so I got a TS chip, tried to install, truck would not start. Figured it was the wrong PCM code. Anyway, took the TS out, re installed the PCM. Then check engine light came on. Code P0676. Truck then shut off. WTF is going on ? Is it possible the PCM is not seated ? Or is it the glow plug controller?
#3
Clear codes and check again.
While I guess it's possible you tripped a glow plug code, it's probably more likely it's just a coincidence and you actually have a bad glow plug.
A few decades ago, while driving my 5.0 at night down the freeway, I lost my headlights. Bam, liked they lost power, they just shut off. Weird thing tho is my high beams still worked, so I clicked them on and finished getting home, a few minutes away. The next day when I went to tackle the problem, both head lights coincidentally had burned out at the exact same time.
Stewart
While I guess it's possible you tripped a glow plug code, it's probably more likely it's just a coincidence and you actually have a bad glow plug.
A few decades ago, while driving my 5.0 at night down the freeway, I lost my headlights. Bam, liked they lost power, they just shut off. Weird thing tho is my high beams still worked, so I clicked them on and finished getting home, a few minutes away. The next day when I went to tackle the problem, both head lights coincidentally had burned out at the exact same time.
Stewart
Last edited by Stewart_H; 09-24-2018 at 02:41 PM.
#4
The PCM torque is strange at best for our trucks.
I too lost drivability after negotiating the chip install.
2 person job. One to shove and hold it thru the firewall, dude on top to align the connector thru the firewall.
Then torque it down. I tried to do it by myself the first time and found the firewall side not quite centered and that was the buffer that every time I crossed tracks, the truck would cut right off.
Proper way. Guy in engine bay. Seat the receiver, who-ever's inside, slide the pcm up the carriage to the reciever ginger like and wiggle a bit while you hold true on firewall side. Start cranking and than hit the torque spec which I can't pull off right now.
I was very wary not to overtighten but if you align the fire-wall-side with the body, you'll be in business.
Denny
I too lost drivability after negotiating the chip install.
2 person job. One to shove and hold it thru the firewall, dude on top to align the connector thru the firewall.
Then torque it down. I tried to do it by myself the first time and found the firewall side not quite centered and that was the buffer that every time I crossed tracks, the truck would cut right off.
Proper way. Guy in engine bay. Seat the receiver, who-ever's inside, slide the pcm up the carriage to the reciever ginger like and wiggle a bit while you hold true on firewall side. Start cranking and than hit the torque spec which I can't pull off right now.
I was very wary not to overtighten but if you align the fire-wall-side with the body, you'll be in business.
Denny
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#8
It starts right up (I mean fast) and idles good. Maybe I should pull the GPCM and clean it real good? Just weird this happened right after I pulled the PCM out.
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So. after the chip was installed, you get this signal and the trucks running great aside from the gp read.
Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.
One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.
This thing might not be lying.
Denny
Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.
One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.
This thing might not be lying.
Denny
#13
So. after the chip was installed, you get this signal and the trucks running great aside from the gp read.
Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.
One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.
This thing might not be lying.
Denny
Unplug the neg side of your batteries overnight and let's see what sparkles in the morning.
One thing we haven't touched on is, when were you're glow plugs replaced? And what flavor.
This thing might not be lying.
Denny
so on the driver side harnes plug, which pin is #6? I'm gonna Ohm it out.