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glow plug


New Member
Aug 26, 2023
Truck Year
I have a 2021 1500 echodiesel with 41k. I had to have total fuel system replaced at 26k. now the check engine light is on again and it says 4th glow plug stuck open. is this a major problem or can it be driven without repercussions. I am leaving for a 2000 mile road trip in a week and of course, can't get into a dealership till end of Sept.

TC Diesel

Well-Known Member
Jul 14, 2016
Truck Year
I don't have the time to confirm this, So look into it. if the CEL is triggered it may NOT passive regen, then the Count down message will display (likely) itself on your trip (EVIC)


Nov 6, 2022
Truck Year
Glow plugs don't open. They are passive elements, activated electrically for start-up.

Fuel Injectors can be open/closed

My CEL never went off in the years I had the DEF/DPF on. Until the dealer replaced the NOx sensor and the engine cratered a few weeks later.