r/gmcsierra

Just joined the Sierra family, but left with a few questions.

1. I went with the 3.0 primarily because the comments in here claiming I’d get 25MPG, even online at GMC says the same thing. But when I purchased my vehicle I noticed on the dealers website said 16/19. I assumed typo on dealers side, but when I got the vehicle the the window sticker even said that, are there some 3.0’s that don’t get the 25MPG+???

2. Accessories, I want to get a step bar that folds out when you open the door. Any recommendations on what brand I should get? Bed cover is the other thing i want to add, any recommendation’s on brand hard covers?

3. Is there any accessories that are must adds?

Appreciate any advice!

I had to take my truck in to my local dealership for a warranty issue. Walked in and there is a customer reaming out a tech/customer rep about an extra $20 on an oil change that he wasn’t expecting since it was cheaper last time. Like loudly, and I thought it would come to blows. I was quietly whisked away before the conclusion, but wow! Say what you will about dealers, but does the guy not know that everything, especially oil and gas are more expensive due to the Middle East conflict? My word, everything is $20+ more expensive these days. Doesn’t matter where you take it, or if you do it yourself.

Also, unless you have free oil changes or it’s under warranty, don’t take it to the dealer. Still more expensive, but at least maybe cheaper elsewhere.

I am in the process of finally upgrading from my 2012 Sierra and I am looking at a 2020 Denali with 72k miles on it. Curious if anyone has any experience and could provide any feedback. Thank you.

GMC Sierra 2024, 23000 miles.

My car shakes when it revs from 1000-2000 RPM at low speed. Took it to the dealer, they replaced valve body. Took a week to source and fix, didn't work.

they replaced torque converter, that was another week.

Now I just got a call that none of the repairs fixed the underlying.

what is going on? Does anyone have any experience with this? Do I get a new transmission? Or a new truck!?

Need some help looking into the transmission and lifters. Buying it from a friend. It’s got 20k miles on it. Curious if it’s worth it with the 8 speed transmission. Anyone’s information is helpful and if it’s worth the purchase. I love this body style and the truck in general. Please let me know all good and bad experiences.

Had a '16 Sierra Denali 1500 w/6.2L. Replaced with '21 Sierra AT4 1500 w/6.2L. Have 70k miles on my '21. Passed Pico test! No mechanical issues thus far. Ready for change.

Like the idea of the Ford Powerboost engine and the 'employee pricing for everyone'. Lots of HP/Torque, better mileage (20+), better range (30 gallon tank). Drove a Lariat and a Platinum. The ride is very crude! Felt vibration through the seats. Bumps in the road cause bouncing. It is a good ab workout holding your torso in place. WTH? I actually got out of a Ford and immediately drove my AT4 the same test-drive route to see if I was imaging things. Nope. My '21 AT4 is so much more civilized. Was not impressed with Ford steering feedback, you can see daylight through the tailgate gaps, most F150's don't have rear wheel well liners, and the rake back to front to mention a few details.

I know there is a ton of brand bias and at least on a GMC page can't be the only one.

I bought my First BRAND NEW Truck! Elevation 5.3L

I've always bought older vehicles to save money with 6 kids. Finally got something nice for myself.

Happiness started to wear off Quickly

First Week an issue with the Radio lost one day to diagnose. Lost another day for them to replace the display.

6th Weeks started running rough for a couple blocks then DEAD needing a tow to nearest Dealership. It has been at the Dealer for over 2 WEEKS NOW!!! They tell me Cam Sensor / Cam Gear / Cam Chain etc ...

GM Canada Customer Service - TERRIBLE at returning calls or Emails !!! I've left emails and phone calls. NO return calls in a WEEK !!! When I called a week later after I left several messages I go the same person on the phone.... Oh well someone else is now looking after it. - Still no Phone Calls or Email not sure I call that Taking care of it. - We can't do anything until the Dealer fixes the truck and let's us know what the full repair is.

Purchased at 69KM(42Miles) - Died at 3,974KM (2,469) !!!!

Any Advice from People who Love their trucks?

https://preview.redd.it/rzlce0ke2d2h1.jpg?width=4000&format=pjpg&auto=webp&s=0a33699e48ccecfe2569c9326dedf5211f890344

The quality of my 2022 Sierra is dog water. I would imagine they used to be reliable trucks but mine has around 20k miles and has already been in the shop twice, each for a week for some issue. The fuel pump failed one time and now my transmission is taking a turn. Maybe mine is just a one-off situation but it wouldn’t help that GMC is scamming me and didn’t even fix the second issue after they had it. They just scammed me with diagnostic fees.

I feel like a weight has been lifted off my chest after deciding to sell my Sierra.

2024 GMC Sierra SLT 5.3L with 10-speed transmission with shifting issues.

(TLDR: Occasional shifting issues. GM updated software, then replaced control module. Still not fixed. What do I do?)

First time I took it in they did a software update, which did jack to help with shifting problems and got a "service transmission now. unable to shift soon" message a few days after picking it up.

Second time they replaced a control module. Still does the same things. If it doesn't give me transmission service messages soon, I guess it will after I put some more miles on it or the warranty is expired.

Is it possible to get them to actually fix it or what? Do I have to take it there every week until they run out of little fixes? First new truck I've ever owned and it really sucks having to deal with this.

Any help would be appreciated. Thanks