2023 Sierra Denali Diesel Buyback purchase?

[Hoopster3]

Hi everyone,

 

I have a somewhat local dealer with a 2023 Sierra Denali 1500 diesel that is for sale at a pretty big discount.  I've owned many Silverados, but never had a diesel.   The reason this Sierra is a buyback is stated as "Engine Coolant Flow Control Valve sticking."

 

I can't get any more information from GM, but that it was fixed.  It's 2023 with a original window sticker of $77k and the truck has 45k miles.  I currently drive 2000 miles per month mainly on the Interstate so the reported 30 mpg was intriguing.  I've never purchased a buy back so any help on that would be appreciated too.  My plan would be to purchase an extended warranty if I could knock the price down further.

 

I also don't want to be stuck with something that's needing work done all the time.  Any concerns on reliability for this truck?

[silveradosid]

i would research that coolant valve, if it is still a back order part that takes time to get, you could be buying a head ache

[Hoopster3]

They state it's fixed.  GM will not provide additional information.  It comes with a 12 month/12k mile warranty, but I'd look to add an extended warranty as well.  Just not sure if this issue is minor or major. 

 

The dealer states the Sierra was California vehicle and they have more relaxed laws on buying a vehicle back, compared to Iowa.  The Carfax shows it was in California.

[Jay P]

Probably this. Coolant Control vale update.

MC-11023152-0001.pdf

[Hoopster3]

47 minutes ago, Jay P said:

Probably this. Coolant Control vale update.

MC-11023152-0001.pdf 313.16 kB · 2 downloads

Would that be a reason to avoid this buyback?  Or would their fix solve those issues?

[Jay P]

3 hours ago, Hoopster3 said:

Would that be a reason to avoid this buyback?  Or would their fix solve those issues?

I take back this may be the reason. The 2023 Silverado/Sierra are not part of this issue, only the 23 Tahoe/Yukon/Escalade are affected. It's only for the LM2 and the 23 ad newer pickups had the LZ0 3.0l diesel. There was a design change to the cooling system when the LZ0 came out and an updated control valve for the LM2 starting in late 23 models and newer. The SUVs didn't get the LZ0 at the same time as the trucks did.

I would want to know it has a good warranty (maybe beyond the factory warranty) before buying.

FWIW our 23 Tahoe with the 3.0l diesel has gotten 32 MPG on open interstate across SD & MN on I90 (some areas in SD have an 80 mph speed limit). Also remember that the diesel will need DEF about every 4000 to 5000 miles if you are driving empty/no trailer. The emission systems on the 3.0l diesel are far more forgiving to short trips than the systems on the 6.6l diesel in the 2500/3500 trucks.

 

Edited December 29, 2025 by Jay P

[Hoopster3]

Thank you so much for taking the time to respond in detail.  I wish I could find out more on what was wrong and an account of the fix, but GM won't/doesn't provide that.  That highway mileage sounds pretty amazing!

[johnnyquick]

1 hour ago, Hoopster3 said:

Thank you so much for taking the time to respond in detail.  I wish I could find out more on what was wrong and an account of the fix, but GM won't/doesn't provide that.  That highway mileage sounds pretty amazing!

Some lenders will squack at a buyback if it shows up as a lemon law or buyback vehicle on the title etc any type of branding will throw em off, check the carfax for that VIN.

[johnnyquick]

1 hour ago, Hoopster3 said:

Thank you so much for taking the time to respond in detail.  I wish I could find out more on what was wrong and an account of the fix, but GM won't/doesn't provide that.  That highway mileage sounds pretty amazing!

I also think that 30mpg may be the promised land and you will  be looking at a hwy mpg of about 25 maybe a bit less in the real World, according to Fuelly

https://www.fuelly.com/car/gmc/sierra_1500/2023?engineconfig_id=148&bodytype_id=14&submodel_id=2096

I have gotten 24mpg on trips when not towing with my 6.2 fully loaded with cruise set at 74 mph.

Edited December 30, 2025 by johnnyquick

[mjm-1957]

What is the last 8 of the vin number?

[Hoopster3]

17 hours ago, johnnyquick said:

Some lenders will squack at a buyback if it shows up as a lemon law or buyback vehicle on the title etc any type of branding will throw em off, check the carfax for that VIN.

I'm waiting to hear back from insurance, but will check with lenders as well.  I'm sure I'll take a beating on the APR on a buyback...

[Hoopster3]

17 hours ago, johnnyquick said:

I also think that 30mpg may be the promised land and you will  be looking at a hwy mpg of about 25 maybe a bit less in the real World, according to Fuelly

https://www.fuelly.com/car/gmc/sierra_1500/2023?engineconfig_id=148&bodytype_id=14&submodel_id=2096

I have gotten 24mpg on trips when not towing with my 6.2 fully loaded with cruise set at 74 mph.

I agree that 30 mpg would be ideal, but am prepared for less.  Currently driving a Kia Stinger AWD GT1 so even 25 would be slightly better.

[Hoopster3]

9 hours ago, mjm-1957 said:

What is the last 8 of the vin number?

PM me

Edited December 30, 2025 by Hoopster3
Removed #'s

[Atlas]

1 hour ago, Hoopster3 said:

I'm waiting to hear back from insurance, but will check with lenders as well.  I'm sure I'll take a beating on the APR on a buyback...

 

There's a difference between basically a courtesy/elective buyback, and a buyback that resulted in the title being branded as a Lemon in accordance with Lemon law. Lemon laws vary by state, but a Carfax would tell you if it actually has a branded title. That is different from simply having an event history that states the vehicle was reacquired by the manufacturer.

 

If no lemon branding, then the vehicle should qualify for the best "new car" interest rates available to you (new car rates from banks typically apply to the last 3-5 model years and under a certain number of miles, even if the car is "used"). You should already know what you qualify for based on your credit score and what your local bank/credit union offers you. Don't let the dealer dictate your financing unless they are willing to best an outside financing offer you already have...

 

Insurance should also be no different from any other used vehicle provided the title is clear.

 

If you are planning to own the truck long term until it's old and fully depreciated, I'd use the buyback as a negotiation to pay less. If they say they already have it discounted, kick them harder. Expensive trucks aren't exactly flying off the shelves these days, new or used.

 

FYI... although the last 8 of a VIN isn't technically sensitive information, you probably don't want it floating around on the internet or at least publicly viewable on a forum. You can edit your post to remove it. If a forum member is offering assistance, maybe pull a GM VIS report from GM's database for you, you can communicate via private message.

[Hoopster3]

45 minutes ago, Atlas said:

 

There's a difference between basically a courtesy/elective buyback, and a buyback that resulted in the title being branded as a Lemon in accordance with Lemon law. Lemon laws vary by state, but a Carfax would tell you if it actually has a branded title. That is different from simply having an event history that states the vehicle was reacquired by the manufacturer.

 

If no lemon branding, then the vehicle should qualify for the best "new car" interest rates available to you (new car rates from banks typically apply to the last 3-5 model years and under a certain number of miles, even if the car is "used"). You should already know what you qualify for based on your credit score and what your local bank/credit union offers you. Don't let the dealer dictate your financing unless they are willing to best an outside financing offer you already have...

 

Insurance should also be no different from any other used vehicle provided the title is clear.

 

If you are planning to own the truck long term until it's old and fully depreciated, I'd use the buyback as a negotiation to pay less. If they say they already have it discounted, kick them harder. Expensive trucks aren't exactly flying off the shelves these days, new or used.

 

FYI... although the last 8 of a VIN isn't technically sensitive information, you probably don't want it floating around on the internet or at least publicly viewable on a forum. You can edit your post to remove it. If a forum member is offering assistance, maybe pull a GM VIS report from GM's database for you, you can communicate via private message.

 

It definitely has a branded title.  I've gone through the Carfax and that my main reason for coming here.  I've never bought a buyback vehicle was so looking to see if this was a known issue, something GM could be trusted when they say it's been fixed, or best to stay away from.

 

I realize a buyback would come some with risk, just trying to minimize that risk OR find out that I need to get out now.  Also, have no experience with diesel and would rarely tow but it would also be a family hauler in addition to 2000 miles a month on the highway.