redwngr

My 40,000 miles '23 LZO has no rattles.

The 10 speed behind my LZO runs between 190 and 200 winter and summer. In colder ambients, it takes longer to get there -- but it does.

Are you saying that if you hold the button in the up poistion it will not travel up or the auto function will not raise the window?

No advice to offer, but pre-refresh trucks work differently than refreshed truck

Every dealer in front license plate states or provinces will be able to fix it up with the conversion kit.. If the vehicle is factory shipped to a license plate state the parts (rpo VK3) will be factory will installed.

GM might decide to limit speed below the trating of the tires (for whatever reason). Hard to believe they would even think about accepting the liability of having the vehicle speed limiter above the rating of the tires they installed. Will tires fail immediately if rated speed is exceeded? --- of course not .

https://gm-techlink.com/?p=14641 Diesel Engine Rear Main Oil Seal April 13, 2021 Some 2020-2021 Silverado, Sierra; 2021 Tahoe, Suburban, Yukon and Escalade models equipped with the 3.0L diesel engine (RPO LM2) may have an oil leak concern and DTC P06DD (Engine Oil Pressure Control Valve Performance) may be set. These conditions may occur if the rear main oil seal has moved or is severely shifted out of position in the timing chain lower cover. If these conditions are found, replace the timing chain lower cover, which comes with a seal already installed. (Fig. 9) Fig. 9 If the seal is tilted out of position, use a caliper and record the depth where the seal is pushed in prior to removing the rear cover. Also place an indexing mark on the seal and cover, which will be helpful to the Warranty Parts Center in case the seal falls out or moves during shipping. (Fig. 10) Fig. 10 Record the Part Unique Number (PUN) found on the white label attached to the back of the cover. The timing chain lower cover comes with a two-piece protector/installer. The inner piece becomes the installation tool. (Fig 11, A) The outer piece simply holds them together for shipment. Remove and discard the outer piece. (Fig. 11, B) Fig. 11 The inner piece acts as an installation tool substitute for the EN-52466-2 seal protector and fits over the bevel on the end of the crankshaft. Be sure that the inner lip of the seal slides over the rear of the crankshaft without rolling during installation or a repeat oil leak may occur. The protector/installer (Fig. 12, shown without cover) will have a snug fit to the pilot of the crankshaft. Fig. 12

Stretch belt install/removal is tool is about $30 and fits in the glovebox or pocket in rear seatback or.... This one is a Lisle

And be careful where and how the pressure was wand gets applied.

Do you stop filling the first time the fuel nozzle clicks or re-activiating it multiple times to squeeze in as much fuel as possible?

Can't answer your question about the 8 speed, but how are you liking the 2.7T ?

And of course the spring loaded idlers also have bearing failures.

I use cruise almost every time I'm in the truck. Adaptive cruise is another tool in the kit. For many years I manually operated regular cruise to 'sorta' behave like adaptive cruise. Hit pause to slow down when approaching slower traffic that I can see I won't be able to pass. Bump the controls up or down to maintain distance when pacing others. Sometimes on longer trips it was a sort of game to see how many miles were possible without needing to use the brakes or throttle. I find that I need to interact with the controls for cruise much less often when it's set to adaptive cruise. And of course in some traffic situations -- I'm mostly thinking about heavy commuter type traffic on limited access roads -- neither type of cruise is usable. I've never been in a vehicle with 'super cruise', but I wonder how well it would behave in those situations that regular cruise or adaptive cruise don't work well? We also have a mid-size GMC suv with adaptive cruise. I don't like it's programming as well as the Sierra..

IIRC, the L76, used in the 1500 was an aluminium block engine The L96, used in HD's until recent change to LT8 was cast iron block LT8 is cast iron block

Colours available on 2026 LT TB The ZR2, LTZ and HC have these

I guess you should put in a new one at the start of every month?

Batteries that live in the heat will die sooner than batteries that live in the cold.

I'm not far from north shore of Lake Erie. I expect at least 7 years. Slow starts are my signal to change.

Fleet order guide shows Shows as only standard and only available on ZR2, LTZ and HC Note 1 applies to LTZ only. Found out what rpo code they were talking about. Ask them if it has HS1. They can print you a build Sheed. It will show more rpo codes that what are shown on the QR code on the trucks doorpost. I do see where the seat is shown in the safety equipment package listing on the (Canadian) price and build -- and does not indicate if all or just some of the trims have it in the package. Wouldn't be the first time the 'build and price' had information that was misleading or incorrect. The 'build and price' that shows this also has this note: U.S. model shown throughout. Due to current supply-chain shortages, certain features shown have limited or late availability, or are no longer available. See the window label or dealer regarding the features on an individual vehicle. Fleet order guide is much more likely to have the correct information.

Are the threads sticking out past the nut by more than 3/8"?

Did the TTPMS sensors also change to auto learn?

On most trims the sensors for TTPMS are a separate order item from the trailering app. They are only standard on AT4X and Denali Ultimate Available on AT4 and Denali (without adding other options) Available on SLE and 3SB version of Elevation (note 1 applies) Available on SLT (note 2 applies) 1500. Sierra max tow (NHT) is only available on SLE, Elevation (3SB) or SLT. You have NHT, so trailer sensors would have been extra. Check the QR code on the bottom of the doorpost of your truck. If the rpo codes listed include PTT then your dealer owes you a set of sensors.

Surround vision guidance mode choices can be selected in settings.

GMAuthority has this story Some GMC Sierra And Yukon Units Need An ECM Software Update By George Barta August 22, 2025 6:06 am GM has issued a Service Update that applies to certain units of GMC full-size trucks and SUVs, including the Sierra, Yukon, and Yukon XL, which is related to an ECM software update. For GMC models, it applies specifically to the 2021-2024 Sierra 1500 and 2022-2023 Yukon and Yukon XL. The Service Update, number N252510321, applies both to vehicles brought to the dealership by customers and to Sierra, Yukon, and Yukon XL units currently in dealer inventory. The involved trucks and SUVs are marked “Open” on their Investigate Vehicle History page. Affected models need a software update to add a Driver Information Center (DIC) warning message to the existing Check Engine Light if DTC P0016 is set. If the necessary update isn’t applied, drivers may not be adequately notified of a potential problem that the Check Engine Light is trying to show them. The fix involves reprogramming the Engine Control Module (ECM). Luckily for owners who have accepted the applicable terms and conditions, the necessary software changes can be made via an over-the-air (OTA) update, so they won’t have to bring their GMC to a dealership. For those who do go to the dealership for the fix, it should take less than an hour. The fix is available free of charge to Sierra, Yukon, and Yukon XL owners through the end of the specific truck or SUV’s New Vehicle Limited Warranty period. It’s unclear at this time how many models are affected, but we know that only the aforementioned model years are affected. The 2021-2024 GMC Sierra 1500 and 2022-2023 GMC Yukon/Yukon XL all ride on the GM T1 platform, which debuted when the current-generation Sierra came out for the 2019 model year. We’re expecting the next generation of GM full-size trucks to arrive for the 2027 model year, and their respective SUV versions should follow shortly thereafter. By George Barta George is an automotive journalist with soft spots for classic GM muscle cars, Corvettes, and Geo.

We don't know. There haven't been building 3.0's for that many years yet. (and the 5.3 ishad changes less than 10 years ago too) The earlier LM2's had the oil bump belt changed scheduled for 150,000 miles (240,000 km) The from 2023 to current, the 3.0 is an LZO with belt replacement scheduled for 200,000 miles (When you 3.0 gets to 200,000 miles, (320,000 km) I'd say (124,000 miles) 200,000 km is a pretty safe bet. There are some that have already had a belt change.