redwngr

With factory install, (mirrors/harnesses/programming) the amber lights in mirrors should be on whenever the marker lights are on. They will blink with the blinkers. The rear facing lights depend on the setting, but they work with the cargo lights. (OM has details, but setting is changed by repeated cargo lamp button presses) The older type trailer mirrors had red arrows on the glass (and lots of complaints about them) but the T1 version doesn't have them.

If your in one of the areas that doesn't get below 0*F (or at least not often) then you won't need one. (but the truck should have included one) Won't need to use the block heater either. (they all shipped with the block heater cord tucked up under passenger side battery) Canadian order guide for 2019 shows: V10 Cover, 1-piece, covers radiator grille and front bumper openings for diesel engines in winter weather 1 - Included and only available with (L5P) Duramax 6.6L Turbo-Diesel V8 engine. The US guide for 2019: V10 Cover, 1-piece, covers radiator grille and front bumper openings for diesel engines in winter weather 1 - Requires (L5P) Duramax 6.6L Turbo-Diesel V8 engine and is required on orders with "Ship To" locations within the following states: Maine, New Hampshire, Vermont, Minnesota, North Dakota, South Dakota, Montana, Alaska, Idaho, Wisconsin, Wyoming, Michigan, Colorado and New York.

As soon as the DexosD approval shows up on the GM's approvals site, and the logo shows up on the bottle, I'll believe them.

There have been other threads about this issue. So far, I haven't read a solution to change to anything beyond the ones they offer. OTOH, we have more than one vehicle using 'profiles', and they do move between vehicles.

Correct. UF3 High idle switch is a 2500/3500 thing.

Picture shows it has 24,000 miles, so if it's two years from new purchase it's still under 3/36,000 bumper to bumper. Failures happen, it's how dealer handles it that is important. What are they proposing for the next step in diagnosis/repair?

Trailboss optional 20" QFV NEW! Tires, LT265/60R20 MT blackwall Goodyear Wrangler Territory 1 - Late availability. Requires (RD5) 20" wheels. Trailboss standard (and included with (B4U) diesel offroad pkg on LT and RST) R3O Tires, LT275/65R18C MT blackwall Goodyear Wrangler DuraTrac

If it makes you sleep at night, it's worth it. Imo, extended warranties don't make economic sense. They are offered because they make money for the seller....who would be out of business if they weren't making money.

I forget for sure what happened ...it was from a 15 to a 16. Might also be that the glue didn't stick on first truck?

Might as well invest the money in a portable generator.

When I moved mine to the second truck, the seal stuck to the cover... Since moved on to retractable covers.

Was it full when you took it in?

Instantaneous torque capability isn't the same as 'long period of time' torque capability. Duty cycle requirement in the HD segment will have a much higher percentage of full load than in the sport world.

Cut and past from the GM notice posted elsewhere: Some 2020 Silverado, Sierra; 2020-2021 Camaro; 2021 Corvette, Tahoe, Suburban, Yukon, and Escalade models equipped with the 5.3L engine (RPOs L82, L84), 6.2L engine (RPOs L87, LT1, LT4, LT2), or 6.6L engine (RPO L8T) may have a misfire and engine noise condition. The Check Engine MIL also may be illuminated along with several possible DTCs, including DTCs P0300, P0106, P0506, P3189, P318A, P318B, P318C, P318D, P318E, P318F, and P3190. These conditions may be due to a broken valve spring. If it’s determined during an inspection that the engine has a broken valve spring, a cylinder leakage test on the affected cylinder must be performed. 5.3L and 6.6L Engines On 5.3L and 6.6L engines (RPOs L82, L84 and L8T) built from June 1, 2020 to October 7, 2020, if cylinder leakage is not observed, replace only the affected valve spring. (Fig. 13) 6.2L Engines On 6.2L engines (RPOs L87, LT1, LT4 and LT2) built from June 1, 2020 to October 7, 2020, if cylinder leakage is not observed, replace all valve springs on both cylinder banks.

Immediate fix -- don't plug it in unless is below 0*F (-18C) According to this from 13 months ago there is an update coming --- don't know if it's released. I've been running 6.6's for many years. They live outside and get started every day. The are never plugged in. Frequent winter temps 0F -10F. I have no intention of plugging my 3.0L for those temps either. This is it's first winter. So far coldest start was about 16F (-9*C). Started just like the middle of summer (except the glow plugs operated a little longer. https://gm-techlink.com/?p=12389 Cooling Fans Running for an Extended Period December 13, 2019 Some 2020 Silverado 1500 and Sierra 1500 models equipped with the 3.0L diesel engine (RPO LM2) (Fig. 12) may have the engine cooling fans running continuously for an extended period of time. The Check Engine MIL also may be illuminated. Fig. 12 Currently, an engine calibration in the Engine Control Module (ECM) will falsely set DTC P0111 (Intake Air Temperature (IAT) Sensor 1 Performance), which occurs when the engine block heater is used in ambient temperatures above 0°F/–18°C. As a result, the cooling system will go into remedial action and turn on the cooling fans at 100%. The remedial action will continue until the engine goes through a six hour cold soak. If this condition is found, clear the DTC and return the vehicle to the customer. Do not perform any further diagnosis or replace any related components. An updated calibration will be available shortly. Also inform the customer to avoid engine block heater use in temperatures above 0°F/–18°C. While the owner’s manual states an engine block heater should be used in temperatures less than 0°F/–18°C, it isn’t vital until much lower temperatures of less than –13°F/–25°C.

Nope. It's 8.1 was no where near the torque capability of the HD 10 speed either. 6.6L LT8 401 Hp 464 ft-lb 8.1L L18 340 Hp 455 ft-lb (for 2001/2/3; 2004/5/6 were lower) I'm thinking they need a different transmission to match up with the LT8

1500 one is too light 25/3500 one is too heavy. They need a 3rd one that is 'just right' for the HD duty cycle at the LT8 torque level.

DFM can change every cycle of the engine. AFM/DFM comparision: https://gm-techlink.com/?p=11880

That's one of the reasons they went to DFM. Many many modes, more seamless/harder to detect. Change change number constantly. That said imo AFM was more 'seamless' than it is often accused of being -- but that also depends on how the truck was being used. https://gmauthority.com/blog/gm/general-motors-technology/general-motors-propulsion-technology/general-motors-dynamic-fuel-management-cylinder-deactivation-technology/ DFM vs AFM https://gm-techlink.com/?p=11880 If you have an L82 (base sierra, or WT or Custom or Custom Trailboss) it will have AFM If you have an L84 (any other trim) it will have DFM In 2020, 5.3L engines with 6 speeds were with L82's and 5.3L with 8 speeds were with L84's

2021 2wd reg cab dually payload: gasser 7442 lb diesel 6523 lb 2021 2wd crew dually payload gas 6894 lb diesel 5894 lb for both: GVWR 14000 lb RGAWR 10500 lb 4wd payloads a little less, GVWR and RGAWR are the same, so weight of transfer case, front diff, front drive shaft and half shafts all reduce available payload.

Range is just a guess on how you might drive in the future... Several ways to estimate range, just as accurately as the estimate from the computer Just like we did before there were 'guess-o-meters' for range. We might even do it better, if we know that we are going to getting better/worse fuel economy due change in the grades/speeds/loads/etc.

There will be diagnostic information available to the dealers technician to test that the sender in the tank and the gauge in the dash. You shouldn't have to tell them anything other than the symptoms.

Custom TrailBoss also has the AFM as an option, and not the DFM The trims that have the AFM (L82) as an option, cannot get the L84 (DFM) engine. Custom TrailBoss can get the 6.2L. The other 3 (Base Sierra, WT, and Custom) cannot get the 6.2L

Seems that some trucks with the clamp issue also develop a fault code. In any case, I believe these pics are the clamp and sensor in question. There is a smoke test they can do to determine if that is the source of the leak. https://gm-techlink.com/?p=1378 Particulate Matter Sensor Protection Tube Performance Diagnostic Setting False DTC October 13, 2020 The particulate matter sensor protection tube performance diagnostic may set a false DTC P1488 (Particulate Matter Sensor Temperature Circuit High Voltage) on some 2020 Silverado and Sierra trucks equipped with the 3.0L Duramax diesel engine (RPO LM2). The Check Engine MIL also may be illuminated. If the vehicle has DTC P1488 set, check if the particulate matter sensor is loose in the exhaust pipe. If the particulate matter sensor is loose, follow the diagnostics in the appropropriate Service Information. If the particulate matter sensor is properly torqued and DTC P1488 is set, test the exhaust for leaks using the GE-52250 Power Smoke Diagnostic Leak Detector. Since the sealing bladder cannot be installed in the tailpipe upstream of the exhaust cooler, it’s recommended to use duct tape to seal the cooler. Repair any leaks as needed and replace the particulate matter sensor. If the joint shown is leaking (Fig. 23), the clamp may have bottomed out before sufficient clamp load was applied to the joint. (Fig. 24) The clamp should be replaced if this condition exists. Fig. 23 Fig. 24 Refer to #PIP5748A for additional information.

Any chance it's just worn out shocks?