redwngr

Fill the def tank and do your own test. I probably wasn't full when delivered. Gauge isn't a typical variable gauge -- it's trying to provide some estimate of how remaining range til empty. If not full when put into service the calcs will give strange results. DEF tank not full has caused huge amounts of grief ever since it came in use on duramax for the 2011 model year. From https://gm-techlink.com/?p=13143 Segmented DEF Level Gauge The current 2020 Silverado 1500 and Sierra 1500 models have a DEF level gauge on the instrument cluster that provides drivers with a representation of how much DEF is in the DEF tank up. (Fig. 2) The DEF level gauge does not operate like a typical float-style gauge that is used in a fuel tank. The Engine Control Module (ECM) monitors the DEF level and consumption rate in order to calculate an estimated range. DEF levels are detected by the DEF level sensor. Fig. 2 There may be some fluctuation in the amount of DEF represented on the DEF level gauge. After filling the DEF tank, it may take a few key cycles to register the correct amount in the DEF tank. With the new segmented DEF level gauge, it is possible that after adding 5 gallons (18.9 L) of DEF that the gauge reads as a full tank after the fill event. However, if the actual level of DEF is just entering the last segment on the gauge, the gauge is likely to drop by one segment shortly after driving after the fill event. As a result, a driver could have an initial impression that the vehicle consumes an excessive amount of DEF.

Any dealer can do warranty. I'd try somebody closer to homw.

Let us know what they say.

I've noticed that from many of those that have reported DIC vs hand calc for the 3.0L.

U1D is standard on 1500 and 2500 SLT/AT4/Denali Trailer tire pressure sensors (PTT) are optional so need to be ordered separately. System is capable of monitorng 6 sensors, but PTT includes 4. Order guide suggests GM Accessories if additional are required (3 axle trailer, or multiple trailers) I'd expect, but haven't confirmed, that the order system would kick out the PTT code (sensors) if the ordered vehicle isn't equipped to monitor them

Yes it is. An air to water one rather than air to air that the 6.6 uses.

It's not on all HD trims for 2021. NEW! Wireless Phone Projection, for Apple CarPlay and Android Auto Not available o WT or Custom On LT - Included and only available with (PCM) Convenience Package II or (ZL6) Advanced Trailering Package. Std on LTZ and HC

Need a yukon. Open the rear gate by waving a foot under it...

That's the grade brake doing it's thing. If the exhaust brake is enabled it will assist in this process. Truck is trying to maintain the speed it thinks you are asking for. No runaway coasting.... FWIW, max rpm under decel is higher than max rpm when powered Maximum Powered Speed 3450 rpm Maximum Braking Speed 4800 rpm

All colours have a 'charge' White Frost Tricoat5 G1W Satin Steel Metallic6 G9K Summit White GAZ Onyx Black6 GBA NEW! Hunter Metallic7 GED Dark Sky Metallic6 GJI NEW! Pearl Beige Metallic8 GJW NEW! Midnight Blue Metallic6 GLU Smokey Quartz Metallic6 GS6 NEW! Cayenne Red Tintcoat6 GSK 1 - Interior color has lighter/darker two-tone effect. 2 - Includes Brandy seat accents. 3 - Requires interior trim (4AA) Jet Black. 4 - Requires interior trim (4AI) Brownstone. 5 - Extra charge. Not available on SLE. 6 - Extra charge. 7 - Extra charge. Only available on Denali. 8 - Extra charge. Not available on AT4. 1 thru 4 are notes regarding interior

IMHO, the best bet is to go and look at them. GM paints are by colour code, so it doesn't have to be on a 2500, as long as the paint code is the same. GMC often uses a different name than chev for the same paint code. Here here are typically more 1500's on lots for colour viewing. Chev name / RPO code / gmc name These are Gone for 2021 2500's: Shadow Gray Metallic GJI Dark Sky Metallic Cajun Red Tintcoat GPJ Red Quartz Tintcoat These are available 2021 2500 colours: Iridescent Pearl Tricoat4 G1W White Frost Tricoat Red Hot G7C Cardinal Red Northsky Blue Metallic GA0 Pacific Blue Metallic Silver Ice Metallic GAN Quicksilver Metallic Summit White GAZ Summit White NEW! Mosaic Black Metallic5 GB8 Ebony Twilight Metallic Black GBA Onyx Black Oxford Brown Metallic GNK Brownstone Metallic NEW! Cherry Red Tintcoat4 GSK Cayenne Red Tintcoat Denali only GCI Carbon Black Metallic (not available after Dec 2020; Denali only colour) Denali only GED Hunter Metallic (not available til Jan 2021; Denali only colour) With the tiny flake in many of these colours, the appearance changes depending on the lighting brightness and angle, distance from the paint etc. Might even be good to compare them under different lighting conditions. If Cajun Red Tintcoat is the preferred, better try and get one locked down. Let us know how it works out!

Can't help with the FGAWR sticker question, but your question made me curious enough to look up the order guide info: VYU Snow Plow Prep/Camper Package, includes (KW5) 220-amp alternator, includes increased front GAWR on Heavy Duty models, (NZZ) skid plates (transfer case and oil pan), pass through dash grommet hole and roof emergency light provisions. Contact GM Upfitter Integration at www.gmupfitter.com for plow installation details and assistance. Note: if ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions Base Sierra and SLE trim - Requires 4WD model and includes (KW5) 220-amp alternator and is upgradeable to (KHF) Dual alternators (220-amp primary, 170- amp auxiliary). Not available with (F60) Heavy Duty Front Spring/Camper Package. SLT - Requires 4WD model and (CGN) spray-on bed liner. Includes (KW5) 220-amp alternator and is upgradeable to (KHF) Dual alternators (220-amp primary, 170- amp auxiliary). Not available with (F60) Heavy Duty Front Spring/Camper Package. AT4 and Denali - Includes (KW5) 220-amp alternator and is upgradeable to (KHF) Dual alternators (220-amp primary, 170- amp auxiliary). Not available with (F60) Heavy Duty Front Spring/Camper Package. F60 Heavy Duty Front Spring/Camper Package, Note: If ordered for Camper usage, recommend ordering (UY2) Trailering wiring provisions All trims - Not available with (VYU) Snow Plow Prep/Camper Package. YVU weight summary table (2500. 3500srw, 3500drw -- all cabs/boxes/engines https://www.gmfleetorderguide.com/NASApp/domestic/printbook?pdftype=option&lang=1&vehicle=21725&rpoid=75833

The garage issue is exactly why the crew cab short box exists. When the crew cab short was created, it was spec'd to be exactly the same wheelbase and overall length as the extended cab 6.5 ft that was in production at that time. (ext cab is now the double cab).

Daily driver -- sure. Not gonna happen on a truck that tows (or other work that results in higher fuel consumption)

Vehicle orders are tracked by the 'order number' and are not assigned assigned a vin (part of which is the production sequence number) until their is a vehicle to stick it to. Soon after the vin is assigned it becomes part of info available with the order number. Lots of dealers will show/advertise a vehicle as 'in transit', and have a picture of a similar vehicle. VEven more common when a new model comes out as they may not yet have any on lot to advertise.

Avatar info update visible (nice truck !) I'm guessing sigs don't show on tapatalk, but they do in web browser and your sig still has the 2014 info - 2014 GMC Sierra SLT 4x4 CCSB 5.3L 4.10 Yukon gears, Superchips Tune 6" BDS with Toyo R/T 35x12.50r20 on OEM 20x9 wheels AMP Research Power Steps, G4 Elite Fold-A-Cover, Rockford Fosgate 10" 500 GM DQS Tow Mirror Upgrade, Prodigy Trailer Break, Tow Spring Build Thread

Time to update your sig and avatar with the new ride info

My 6.6 gets 11 or 1200 miles per gallon def. I'd expect that with the fuel mileage you're getting that your's would easily be 1500 miles per gallon. When you get to say 5000 miles, fill it at a bulk pump and do a hand calc. You'll have mpg, will know about how much was remaining in tank, and what the indicator was reading at that stage. Def indicator / LED display is a new thing for the 3.0 and the 20+ HD's. It's not a traditional gauge with a float. https://gm-techlink.com/?p=13143

Remote start is standard on all trims except the base work truck. Keyless open/start on LT and above

Depends on trim and on some trims it depends on 2wd/4wd. MQB Transmission, 10-speed automatic, electronically controlled with overdrive and tow/haul mode. Includes Cruise Grade Braking and Powertrain Grade Braking Base sierra - not available SLE and Elevation - Included and only available with (L84) 5.3L EcoTec3 V8 engine on 4WD models or (LM2) Duramax 3.0L Turbo-Diesel I6 engine. SLT and Denali - Included and only available with (L84) 5.3L EcoTec3 V8 engine on 4WD models, (L87) 6.2L EcoTec3 V8 engine or (LM2) Duramax 3.0L Turbo-Diesel I6 engine. AT4 - standard

GMC Sierra /Denali 1500 Deletions (A52) Front 40/20/40 split-bench seat (G2X) Deep Mahogany Metallic (GPJ) Red Quartz Tintcoat exterior paint (GS6) Smokey Quartz Metallic (GCI) Carbon Black Metallic (QT3) Manual tailgate function with lift assist (MCY) Single USB Port (PDP) Denali Premium Package TC10743 2WD Standard Bed Crew model deleted New Features (GB8) Ebony Twilight Metallic exterior paint (GSK) Cayenne Red Tintcoat exterior paint (GED) Hunter Metallic exterior paint (GNK) Brownstone Metallic (RGE) Safety Essentials Package (RFX) X31 Off-Road and Protection Package (BKF) Premium Front floor liners with removable carpet inserts (BKE) Premium Rear floor liners with removable carpet inserts (QFV) Tires, LT265/60R20 MT blackwall Goodyear Wrangler Territory (VXW) LPO, AT4 high clearance step (SES) LPO, 22" (55.9 cm) Multi-spoke Polished wheels Wireless Phone Projection, for Apple CarPlay and Android Auto on (IOS) and (IOT) Audio systems Changes Double Cab models not available on SLT and AT4 (PDU) SLE Value Package consisting of (PCQ) SLE Convenience Package, (G80) Auto-locking rear differential, and (Z82) Trailering Package is standard on SLE (PDE) Elevation Value Package consisting (PCR) Elevation Convenience Package, (G80) Auto-locking rear differential and (Z82) Trailering Packageis standard on Elevation (A50) Bucket seats are available as an option on Elevation (PCP) AT4 CarbonPro Edition wheels may be upgraded to (NZQ) 20" 6-spoke Carbon Grey painted aluminum wheels with (QFV) LT265/60R20 MT blackwall Goodyear Wrangler Territory tires (U2K) Sirius XM Radio is standard on 3SA and 3SB (AE7) Front 40/20/40 split-bench with covered armrest storage is standard on 1SA (QK2) GMC MultiPro Tailgate is now availabler on 3SA and 3SB (HVH) Dark Walnut / Slate is no longer available on Elevation Trim (BKE) and (BKF) Premium floor liners now standard on AT4 (UVN) Bed View Camera is no longer available as free flow and is included and only available with (CWM) Technology Package (CF5) Sunroof is not available on 3SA and 3SB (NHT) Max Trailering Package with (L84) 5.3L EcoTec3 V8 engine is "Available for (SRE) sold order types only" AVAILABLE MODELS (Sierra) 2WD Short Bed Crew Cab (TC10543) 4WD Short Bed Crew Cab (TK10543) 4WD Standard Bed Crew Cab (TK10743) 2WD Standard Bed Double Cab (TC10753) 4WD Standard Bed Double Cab (TK10753) 2WD Long Bed Regular Cab (TC10903) 4WD Long Bed Regular Cab (TK10903) Chevrolet Truck Silverado 1500 Deletions (G2X) Havana Brown Metallic (GPJ) Cajun Red Tintcoat (A52) Front 40/20/40 split bench seat (QT3) Tailgate (UVI) Trailer Camera Package (MCY) USB port (NZT) 20" x 9" painted aluminum with machined face and Gray accent pocket wheels (PDA) Texas Edition (PCQ) LT Value Package (PCR) RST Value Package (PDL) LTZ Texas Edition (B59) Remote Start Package (XFE) Fuel Economy Package New Features (GB8) Mosaic Black Metallic (GNK) Oxford Brown Metallic (GSK) Cherry Red Tintcoat (RGE) Safety Essentials Package available on Work Truck (1WT), Custom (1CX) and Custom Trail Boss (2CX) (PDD) All Star Edition Plus (PDP) Texas Edition Plus (PDY) LTZ Premium Texas Edition (BKF), (BKE) Carpeted floor liners Wireless Phone Projection, for Apple CarPlay and Android Auto (QFV) LT265/60R20 MT blackwall Goodyear Wrangler Territory tires Changes CC10743 2WD Crew Cab Standard Bed model is no longer available on Custom (1CX), RST (1SP), LTZ (1LZ) or High Country (3LZ) CC10753 2WD Double Cab Standard Bed model is no longer available on RST (1SP) or LTZ (1LZ) CK10753 4WD Double Cab Standard Bed model is no longer available on LTZ (1LZ) (PDX) Custom Value Package is now standard on Custom (1CX) and includes (PCX) Custom Convenience Package, (ZLA) Infotainment Package and (Z82) Trailering Package (PCX) Custom Convenience Package and (ZLA) Infotainment Package are now standard on Custom Trail Boss (2CX) (PDU) All Star Edition, (PCL) Convenience Package, (Z82) Trailering Package and (G80) Auto-locking rear differential are now standard on LT (1LT) and RST (1SP) (PCH) Convenience Package with Bucket Seats is now standard on LT Trail Boss (2LT) (PDF) LTZ Plus Package is now standard on LTZ (1LZ) and includes (PCZ) LTZ Convenience Package and (PQB) Safety Package (AE7) Front 40/20/40 split-bench seat is now standard on Work Truck (1WT), Custom (1CX) and Custom Trail Boss (2CX) (MCZ) USB ports are now standard on Work Truck (1WT), Custom (1CX) and Custom Trail Boss (2CX) (U2K) SiriusXM is now available on Work Truck (1WT) and standard on Custom (1CX), Custom Trail Boss (2CX) LT (1LT), RST (1SP) and LT Trail Boss (2LT) (UE1) OnStar is now standard on Custom (1CX) and Custom Trail Boss (2CX) (QT5) EZ Lift and Lower tailgate is now standard on Custom (1CX), Custom Trail Boss (2CX) and LT (1LT) (QT6) Power up and down tailgate is now standard on LTZ (1LZ) and available on LT (1LT), RST (1SP) and LT Trail Boss (2LT) (RD5) 20" x 9" Black painted aluminum wheels are now free flow on Custom Trail Boss (2CX) and LT Trail Boss (2LT) (RD2) 20" x 9" Polished finish wheels are now standard on LTZ (1LZ) (CF5) Sunroof no longer available on LT (1LT) (NHT) Max Trailering Package with (L84) 5.3L EcoTec3 V8 engine now requires a sold order type (BG9) Rubberized-vinyl flooring on LT (1LT) now requires a sold order type AVAILABLE MODELS (Chev) 2WD Short Bed Crew Cab (CC10543) 4WD Short Bed Crew Cab (CK10543) 2WD Standard Bed Crew Cab (CC10743) 4WD Standard Bed Crew Cab (CK10743) 2WD Standard Bed Double Cab (CC10753) 4WD Standard Bed Double Cab (CK10753) 2WD Long Bed Regular Cab (CC10903) 4WD Long Bed Regular Cab (CK10903)

Where are you hearing that they have a lot of problems with the new HD transmission?

I wouldn't put a lot of faith in the gauge, based on the reports on multiple forums. Fill it, run it for 3000 - 4000 miles and refill and do a hand calc. Remember, that the initial warnings are range/miles to empty. Once it thinks it's empty, there is still 500 miles til the 65 mph speed limit. Should be more than enough miles to get it to the next fuel stop and a def refill location without having any limit on speed.

Are you are running truck 'unloaded' and have factory tire sizes at the pressures on the door sticker? If so try running reduced tire pressure - its a free trial. Washboard road has always been a issue in a pickup -- especially unloaded and at speed. Suspension adjustment -- by setting tire pressure match current loading -- can help.

3.0 is a couple 100 lbs heavier, based on payload ratings. There is a weight calculator if you're wanting to compare weights for specific models and trim levels. https://www.gmfleetorderguide.com/NASApp/domestic/weightcalc.jsp?vehicleid=21796&regionid=1&step=1