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: Check engine light running code P0674 in my 2007 classic 2500HD NAC1989 08-10-2010, 12:03 AM The check engine light came on today ran the code and got P0674 which is cylinder 4 glow plug circuit. Any recomendations on what to do and is it possible that this truck needed the GCM reflash that the 2006's had done. Any help would be greatly appreciated. Thanks Ramblinrodney 08-10-2010, 08:01 AM Search glow plug circuit, lots of info. John Armstrong 08-10-2010, 05:00 PM The check engine light came on today ran the code and got P0674 which is cylinder 4 glow plug circuit. Any recomendations on what to do and is it possible that this truck needed the GCM reflash that the 2006's had done. Any help would be greatly appreciated. Thanks You still under warranty? If so take it to dealership and have them replace them. I had one bad and had all mine replaced at dealer using my extended warranty. NAC1989 08-10-2010, 11:35 PM Thanks for the help. Ramblinrodney did just that and got the answer I was looking for. John my warranty is up I stopped by the dealer and they want to do a bunch of useless diagnostics and charge me $75 when I already know what the problem is. Im just going to get a new glow plug and just replace it myself heard its a pretty simple fix hoping thats true. But thanks againg for the help rvjabo 08-11-2010, 05:18 PM DID MY GLO PLUGS TODAY 2.5 HRS WITH ROTATING TIRES GREASE CHANGE TRANS SCREW ON FILTER! GOT PLUGS AT ROCK AUTO 8 FOR 162.00 SHIPPED! EASIEST JOB I EVER DID ON MY DIESEL:rolleyes: | ||