2005 Ford Excursion with a 6.0 diesel had two codes pop up P0678 cylinder 8 glow plug open circuit and P0672 cylinder 2 glow plug open circuit. I ended up ohming out all 8 glow plugs and found cylinder 8 was at 2.1 ohms while all the other cylinders were at .7 to .8 ohms. Replaced cylinder 8 glow plug erased dtc codes and codes never came back seemed to fix the issue. Glow plug was purchased from Amazon and I have provided a link below I will also include a link to the removal tool and also a link to the scan tool as well.
Motorcraft Glow Plugs: amzn.to/3JUX17A
Lisle Glow Plug Harness Removal Tool: amzn.to/3w67iYX
Kingbolen Scan Tool: amzn.to/3z4yI3P
Update so after a few days both codes came back for cylinder 8 and cylinder 2 again. I replaced the whole glow plug control module and that has totally fixed the problem. So listed below is a link to the oem motorcraft glow plug control module.
Motorcraft Glow Plug Control Module: amzn.to/3CKcJQU
Негізгі бет P0678 Ford 6.0 Diesel Glow Plug Repair
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