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What was the fix for the erratic DEF tank levels that creates the Limp mode warning? My 2020 with 100,000 miles is now doing this? Full then not with warning. Is this a GMC emissions responsibility issue? I need to resolve it as we drive long distances in Alaska. Thanks DFE!

Thanks Denny56👍

Did you figure out answers to your own questions? What did you settle on for installing your remote oil filter adapter, fittings & hoses? Thanks, DFE

Just up two positions in these threads I started one titled "Engine Cooling Fan Runs @ High Speed on Cold Start-Up". Well it's doing it again. Today it's negative 25 degrees F outside at startup. Both engine cooling fans once again came on at full speed. Engine block heater was plugged in. No...

Well it's doing it again. Today it's negative 25 degrees F outside at startup. Both engine cooling fans once again came on at full speed. Engine block heater was plugged in. No hesitation starting up. Not sure what is causing this. There is no CEL on & no codes present. I will look for more...

Those temperatures seem extremely low. Are you stating engine coolant temperatures, engine oil temperatures or transmission oil temperatures? If you are stating engine coolant temperatures, I would think that you have a the coolant control valve issue. I would believe coolant temperatures that...

Gemarsh, Thanks!

Gemarsh, Thanks for the reply & information. I'll do some more research on the shutters. This morning we had a major outside temperature increase, 38°F currently outside. Upon startup the truck engine cooling fans were operating properly, very puzzling? Any suggestions on service/repair manuals...

Gemarsh, One more thing. The reason I'm asking these questions is I'm trying to troubleshoot my cooling fans that are running on continuous high speed operation while it's 0°F outside. See my thread about cooling fans. TIA

Gemarsh, I'm a DIY'er & do as much myself as possible for maintenance & repair of all my equipment. Thanks for your input on the shutters. After reading this I looked in my truck operators manual for information. I didn't see any info like the PDF image from a manual you provided. Where did you...

No the CEL is not illuminated, otherwise I would have connected my OBD2 reader. The shutters are in the open position. I thought maybe they would be stuck in the closed position. So not sure if it's a position sensor, a temperature sensor or the ECM causing the issue. Last time disconnecting the...

We bought this as the second owners off the local Dodge dealer used lot. It came with the Leer topper already on it. I like it as it helps keep our gear dry by keeping out the rain & snow both as we drive locally & on our long 900 mile round trips to our cabin. A very good quality topper.

2020 GMC Elevation 62,000 miles. I have a problem with the engine cooling fans running on high speed on a cold strat-up. I imagine one of the engine temperature sensors has failed. I disconnected the positive battery terminal for about 30 minutes & then reconnected it. The truck started up...

We bought this 2020 GMC Sierra 1500 Elevation with 42,000 miles on it in November 2023. I was surprised someone would turn it in to a Dodge dealer. On trips it averages 27 mpg in warmer weather & 24-25 mpg in cold weather, with warm-ups & on winter diesel. We've put 20,000 miles on it & very...