2020 Freightliner won't start, multiple trips to the shop.

Yeah, I did that when it happened to me, but this light is not a check engine light, it's an engine light, the first one, which there's no code on the dash for it, the frustrating thing is, I JUST got my truck back from the shop, they changed the whole coolant system, like the tank and sensor, put a bring new tank full with coolant in it, but now I'm gonna put it back in the shop again!

 

Does it normally not give you a code?

 

Back in the day when the first ecms were bolted to an engine block if engine water temp gauge showed normal and oil pressure gauge showed normal and engine still running like it should that light would be ignored for 100’s of thousands of miles.

 

Lol, yup, I just don't want that red check engine light to come on randomly on the road with me again LOL!!!

 

Cascadia life

 

Back in the early 2000s, one very cold morning, a guy next to me was having trouble starting the FL with the ecm on the block. He whips out the propane torch( that one should always carry), warmed up the ecm for a minute, ZOOM,