Interesting... My truck threw a CEL this week (emission message, 160 miles until limited speed 65 MPH) this was the second time in 800 miles and my truck only has 3800 miles on it. I have had 5 CEL since new three times in the dealership, the other two cleared after second or third ignition cycles. The first time was during the test drive with only 55 miles on the odometer! Every time the dealer said it was the emission system related to the DEF system, DEF tank heaters and now the pump. This week the service manager said they had to order parts i.e. a coolant? pump, hoses, and a control module. Sorry I don't have any codes or part numbers to share but when the parts are in and replaced I will follow up. Also I have only shown two gauge bars of DEF fluid used since new, I have always felt the DEF system wasn't injecting enough DEF into the engine, maybe I was correct? Side note my last tank MPG was low 23 MPG highway mostly, I filled up after my service appointment this week and saw a improvement to 31 MPG highway which made me feel better...at least for now!
Strange story but I'll break it down and make it as simple as I can... Bought my new 2020 Duramax back in April, during the test drive at the dealership I noticed a CEL and pointed it out to my salesman. The Dealership cleared the CEL before delivery (55 miles on the odometer) and the repair order said they replaced the "Emission Reduction Fluid Tank" because the reductant heater 3 current was high scan code: P221F. Fast forward to 2400 miles, After mixed driving and towing maybe 200 miles of towing total I noticed two things about my 3.0 Duramax, first the engine always made a muffled noise when coasting below highway speed, sounded like a mini Jake brake. Secondly I hadn't seen any drop of DEF on the dash screen until after 2400 to 2985 miles and then just one bar. So today I got my free LOF and tire rotation and wouldn't you know on my drive to the dealership I got a CEL Emission warning "169 miles to reduced 65 MPH speed" The Techs repair order states that codes "2985 P21DD 00 P221E were set in ECM, the fix was to install a recall "N202300791 Diesel Exhaust Fluid Inactive Recall" per recall reprogrammed exhaust fluid module. Now maybe it was the recall or something else the Tech found but now my truck's Duramax engine is NOT making the muffled noise when coasting below highway speed and I think I actually can hear a very faint turbo wine when accelerating! I hope ever thing is now fixed correctly? Has anyone with the new 3.0 Duramax heard of this happening? Thanks
When my truck was brand new I backed up to my trailer and tried this feature highlighted in red. I ready liked it at the time and thought the GM Engineers ready did a great job designing the software, but now I can't seem to make this feature work? The dealer said its working at designed?? Has anyone else tried or had issues with useful feature? When I backup now with the "hitch view" camera and shift into park, I roll back an inch or so unless I manually engage the parking brake. My question is for anyone that owns a 2020 Silverado LT this highlighted text was copied and pasted from our Owner's Manual in the Driving and Operating section Rear Vision Camera (RVC) para:8 8. Hitch View Assists with connecting to a trailer by providing a zoomed-in view of the hitch to help align the vehicle’s hitch ball with the trailer coupler, or to monitor the trailer connection. To select, touch Hitch View on the infotainment display when a camera view is active. To access this view when in a forward gear above 12 km/h (8 mph), touch CAMERA on the infotainment display and touch the Cargo Bed View icon. The view will close after 8 seconds and can be closed early by touching X. Shifting into P (Park) while in this view will automatically engage the Electric Parking Brake (EPB).
What kind of Highway MPG do you get with the 3.73 gears? Most others that are getting 30 MPG highway unloaded have the 3.23 gears like mine. I think your truck has the "diesel off-road" package? Thanks
If you encounter any down hill grades while towing please try the exhaust brake with TH and cruise control and no cruise control. TFL had poor results with this test and I would like to see if other driving techniques would help engage the exhaust brake sooner? Thanks.
I have the same question...I'm thinking about getting my truck in to be checked because according to my DEF gauge I have a full DEF tank since new with about 3K with a little towing. Seems like everyone uses a lot more DEF after the update?
My dealership filled my DEF tank when I took delivery of my new 2020 Silverado 1500 3.0 Duramax, I now have ~1800 miles on the truck and the DEF gauge still reads full, when will I see a drop on the DEF gauge? Mostly highway miles not towing yet, average mileage 27.9 to 29.1. Love the truck but I'm starting to wonder about my DEF usage???
The "diesel off-road package" RPO code B4U trucks must be kind of rare, I never found one near me when I bought my 2020 truck. Please continue to share your towing driving reviews and mpg results with the rest of us Duramax 3.0- 3.23 ratio folks. ?
Checked already about this and found Titan makes Aux fuel tanks that fit in place of the spare tire for other pickup trucks. This would be an option once they make one for our trucks!?
Welcome, one of my reasons for buying my Silverado LT 3.0 Duramax was the tow rating at a reasonable RPM, I towed with a 2017 5.3 and was tired of the 6 speed transmission and the high RPM's at highway speeds. As for your question about the oil change cost between the Ram ecodiesel and the 3.0 Duramax this was another reason I picked the Duramax. I compared the oil, oil filter, and fuel filter cost and was disappointed of how expensive the Ram was for common maintenance! I did test drive a 2020 Ram ecodiesel and liked the engine and interior but did encounter a few harsh down shifts from second into first gear. The lower maintenance cost on the GM Duramax is what finally made me decide on the Silverado and the better mileage on the Silverado too. I get a discount at my Chevy dealership on parts and paid under $5.00/Qt. for 0W-20 Dextros D oil the engine takes 7 qts. vs. 10.? in the ecodiesel The oil filter was also under $5.00 (PF-66), I haven't bought a AC Delco fuel filter yet but I did look at the Ram fuel filter cost...WOW! Good luck on your new truck and buy what works for you!
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