Doc76

Dang man, that is the exact thing mine was doing, right down to the crappy fuel mileage. Mine goes in next week for the glow plug. I will ask them then what they think about and ECM problem. I have a case open with GM corporate so will ask them as well.

Got mine back earlier in the week. Dealer didn't know if pump design had changed but said he has only seen a few of these failures. (I have heard that before though) My other code was due to a faulty glow plug. Was testing just under spec. Goes in for that next week under powertrain warranty. So far so good, truck runs great again. Saw a slight fuel mileage decrease with the bad coolant pump. Not sure exactly why but have gained at least 2-3 mpg back. Also nice to have remote start back now that the CEL is off.

Mine goes in tomorrow. Been a long winter with no remote start. In the time since the part came in and the repair appointment was made last week I have a new CEL, P1338. Also got a service brake monitor system on the dash yesterday. Hoping they can fix all of them tomorrow. also was driving it the other day and with no warning went from 1k miles of DEF to zero and said tank was empty. I check it usually each tank and last check was half full. So seems to be using it much faster now. First winter owning the truck so maybe the different fuel blend builds up faster in the dpf? not gonna like, really starting to miss my F150. I love this truck but damn, seems like it’s always something.

2020 Silverado 3.0 Duramax, 46K Miles. Same code. Part has been backordered since November. At first the light was only on once in a while, now it's on all the time. I asked the service department if it's ok to continue driving and they said as long as the truck isn't in limp mode, then it should be ok. Not too happy it has taken this long to get the part and get it fixed.