× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network

P0684 Diagnostic Trouble Code Discussion for December 2014

Glow Plug Module Communication Signal Performance


Note: This is a professional automotive technician's resource.
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Trouble Ticket Help Requests for DTC P0684
Help Request Posted
2008 Ford F-450 Super Duty XL 6.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FDXW47RX8
P0684: Glow plug control module to pcm. Alright ford diesel techs bear with me new to diesel world. Vehicle brought in on truck. Complaint is excessive smoke and misfiring. Quick visual inspection showed that crankcase was overfull and looks like fuel is getting mixed in the oil. Used scan tool and...
December 10, 2014
2008 Ford F-450 Super Duty XL 6.4L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1FDXW47RX8
P0684: Glow plug control module to pcm. Alright ford diesel techs bear with me new to diesel world. Vehicle brought in on truck. Complaint is excessive smoke and misfiring. Quick visual inspection showed that crankcase was overfull and looks like fuel is getting mixed in the oil. Used scan tool and...
December 11, 2014