P0678... replaced parts, cant figure it out - Ford Powerstroke Diesel Forum
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Old 04-01-2013, 02:53 PM
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P0678... replaced parts, cant figure it out

I did my HG's about 2 months ago or so and went ahead and replaced all the glow plugs and the glow plug harnesses (from Tousley) and started getting a P0678. I was doing some reading on the internet and unplugged the GPCM and tested the glow plugs and all were at 1 ohm. Over the weekend i replaced the GPCM (oem from Tousley) this weekend, cleared the code and it went away for a day and a half and it came back on this afternoon with the same code (P0678) Do you guys have any suggestions?? The only other thing i can think of from reading is to replace that one glow plug again and/or check the battery terminal connections.
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Old 04-01-2013, 05:14 PM
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Possible wiring or connection issue.
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Old 04-02-2013, 03:58 PM
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well, i just went under the truck to see if i can push down on the glow plug harness for cylinder 8 and it was pretty much just resting on top of the hole for the glow plug. I can swear that when i had the heads off the truck when i was doing the HG's i made sure they were all seated on. Ill see how it does now.
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