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Technical Service Bulletins of the 2024 GMC Sierra 3500

There have been 58 technical service bulletins issued for the 2024 GMC Sierra 3500.

1 2024 GMC Sierra 3500 engine and engine cooling TSB (Bulletin N242438501-01)

Bulletin Date: May. 6, 2024
Component: Engine and engine cooling.
Bulletin Summary: Service update - certain vehicles with a 6. 6l diesel engine have an engine control module (ecm) that may not properly diagnose, may not set diagnostic trouble codes (dtcs), or may not illuminate the malfunction indicator light (check engine
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

2 2024 GMC Sierra 3500 electrical system TSB (Bulletin N242438501-01)

Bulletin Date: May. 6, 2024
Component: Electrical system.
Bulletin Summary: Service update - certain vehicles with a 6. 6l diesel engine have an engine control module (ecm) that may not properly diagnose, may not set diagnostic trouble codes (dtcs), or may not illuminate the malfunction indicator light (check engine
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

3 2024 GMC Sierra 3500 unknown or other TSB (Bulletin N242438501-01)

Bulletin Date: May. 6, 2024
Component: Unknown or other.
Bulletin Summary: Service update - certain vehicles with a 6. 6l diesel engine have an engine control module (ecm) that may not properly diagnose, may not set diagnostic trouble codes (dtcs), or may not illuminate the malfunction indicator light (check engine
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

4 2024 GMC Sierra 3500 engine and engine cooling TSB (Bulletin 23-NA-032)

Bulletin Date: Apr. 29, 2024
Component: Engine and engine cooling.
Bulletin Summary: The informational bulletin advises the tech to use the glow plug bore cleaner to reduce the chance of soot building up on the glow plug causing a premature failure.
Vehicles covered in this TSB:
2017 Chevrolet Cruze, 2018 Chevrolet Cruze, 2019 Chevrolet Cruze, 2018 Chevrolet Equinox, 2019 Chevrolet Equinox, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2017 Chevrolet Silverado 2500, 2018 Chevrolet Silverado 2500, 2019 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2017 Chevrolet Silverado 3500, 2018 Chevrolet Silverado 3500, 2019 Chevrolet Silverado 3500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2019 Chevrolet Silverado 4500hd, 2020 Chevrolet Silverado 4500hd, 2021 Chevrolet Silverado 4500hd, 2022 Chevrolet Silverado 4500hd, 2019 Chevrolet Silverado 5500hd, 2020 Chevrolet Silverado 5500hd, 2021 Chevrolet Silverado 5500hd, 2022 Chevrolet Silverado 5500hd, 2019 Chevrolet Silverado 6500hd, 2020 Chevrolet Silverado 6500hd, 2021 Chevrolet Silverado 6500hd, 2022 Chevrolet Silverado 6500hd, 2021 Chevrolet Suburban, 2022 Chevrolet Suburban, 2024 Chevrolet Suburban, 2021 Chevrolet Suburban 1500, 2022 Chevrolet Suburban 1500, 2023 Chevrolet Suburban 1500, 2024 Chevrolet Suburban 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2017 GMC Sierra 2500, 2018 GMC Sierra 2500, 2019 GMC Sierra 2500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2017 GMC Sierra 3500, 2018 GMC Sierra 3500, 2019 GMC Sierra 3500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500, 2018 GMC Terrain, 2019 GMC Terrain, 2021 GMC Yukon, 2022 GMC Yukon, 2023 GMC Yukon, 2024 GMC Yukon, 2021 GMC Yukon Xl, 2022 GMC Yukon Xl, 2023 GMC Yukon Xl, 2023 GMC Yukon Xl 1500.

5 2024 GMC Sierra 3500 equipment TSB (Bulletin 22-NA-096)

Bulletin Date: Apr. 25, 2024
Component: Equipment.
Bulletin Summary: This informational bulletin provides information for dealers/technicians on customer education bulletin for google built-in radio.
Vehicles covered in this TSB:
2022 Brightdrop EV600, 2024 Brightdrop Zevo 400, 2023 Brightdrop Zevo 600, 2024 Brightdrop Zevo 600, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2022 Chevrolet Suburban, 2022 Chevrolet Suburban 1500, 2023 Chevrolet Suburban 1500, 2022 Chevrolet Tahoe, 2023 Chevrolet Tahoe, 2022 GMC Hummer Ev, 2023 GMC Hummer Ev, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500, 2022 GMC Yukon, 2023 GMC Yukon, 2022 GMC Yukon Xl, 2023 GMC Yukon Xl, 2023 GMC Yukon Xl 1500.

6 2024 GMC Sierra 3500 power train TSB (Bulletin 23-NA-191)

Bulletin Date: Apr. 24, 2024
Component: Power train.
Bulletin Summary: This bulletin provides a service procedure to correct a customer concern of a shake and/or shudder during steady speed and/or light throttle acceleration between 25 and 50 mph (40 and 80 km/h).
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

7 2024 GMC Sierra 3500 electrical system TSB (Bulletin 23-NA-191)

Bulletin Date: Apr. 24, 2024
Component: Electrical system.
Bulletin Summary: This bulletin provides a service procedure to correct a customer concern of a shake and/or shudder during steady speed and/or light throttle acceleration between 25 and 50 mph (40 and 80 km/h).
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

8 2024 GMC Sierra 3500 engine and engine cooling TSB (Bulletin N242438501)

Bulletin Date: Apr. 9, 2024
Component: Engine and engine cooling.
Bulletin Summary: Service update - certain vehicles, with a 6. 6l diesel engine, have an engine control module (ecm) that may not properly diagnose, may not set diagnostic trouble codes (dtcs), or may not illuminate the malfunction indicator light (check engi
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.
 

9 2024 GMC Sierra 3500 electrical system TSB (Bulletin N242438501)

Bulletin Date: Apr. 9, 2024
Component: Electrical system.
Bulletin Summary: Service update - certain vehicles, with a 6. 6l diesel engine, have an engine control module (ecm) that may not properly diagnose, may not set diagnostic trouble codes (dtcs), or may not illuminate the malfunction indicator light (check engi
Vehicles covered in this TSB:
2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

10 2024 GMC Sierra 3500 side/rear glass TSB (Bulletin 24-NA-046)

Bulletin Date: Mar. 7, 2024
Component: Side/rear glass.
Bulletin Summary: This technical bulletin provides a procedure to correct the condition of suction cup marks on window glass.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2019 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2019 Chevrolet Silverado 3500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2019 GMC Sierra 2500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2019 GMC Sierra 3500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

11 2024 GMC Sierra 3500 radio/tape deck/cd TSB (Bulletin PIT6101A)

Bulletin Date: Feb. 27, 2024
Component: Radio/tape deck/cd.
Bulletin Summary: This preliminary information communicates engineering is investigating a no audio issue.
Vehicles covered in this TSB:
2023 Buick Enclave, 2023 Cadillac XT5, 2023 Chevrolet Blazer, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 4500hd, 2024 Chevrolet Silverado 4500hd, 2023 Chevrolet Silverado 5500hd, 2024 Chevrolet Silverado 5500hd, 2023 Chevrolet Silverado 6500hd, 2024 Chevrolet Silverado 6500hd, 2024 Chevrolet Silverado Ev, 2023 Chevrolet Suburban, 2024 Chevrolet Suburban, 2023 Chevrolet Tahoe, 2024 Chevrolet Tahoe, 2023 Chevrolet Traverse, 2023 GMC Acadia, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2024 GMC Sierra 3500, 2023 GMC Yukon, 2024 GMC Yukon.

12 2024 GMC Sierra 3500 engine and engine cooling:engine:engine control module (ecu/ecm) TSB (Bulletin PIP5963)

Bulletin Date: Feb. 27, 2024
Component: Engine and engine cooling:engine:engine control module (ecu/ecm).
Bulletin Summary: This preliminary information communicates to technicians to clear the codes and release the vehicle if it arrives for a p062b set, and to replace the ecm if it has been in previously.
Vehicles covered in this TSB:
2024 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2024 GMC Sierra 1500, 2024 GMC Sierra 2500, 2024 GMC Sierra 3500.

13 2024 GMC Sierra 3500 electrical system TSB (Bulletin PIT6076A)

Bulletin Date: Feb. 26, 2024
Component: Electrical system.
Bulletin Summary: This preliminary information communicates that you may notice a black screen on their radio display. This can happen for a period of a couple seconds or the entire ignition cycle. Engineering is aware of the issue and investigating.
Vehicles covered in this TSB:
2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2024 Chevrolet Silverado Ev, 2022 Chevrolet Suburban, 2023 Chevrolet Suburban, 2022 Chevrolet Tahoe, 2023 Chevrolet Tahoe, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2024 GMC Sierra 3500, 2022 GMC Yukon, 2023 GMC Yukon, 2022 GMC Yukon Xl, 2023 GMC Yukon Xl.

14 2024 GMC Sierra 3500 radio/tape deck/cd TSB (Bulletin PIT6076A)

Bulletin Date: Feb. 26, 2024
Component: Radio/tape deck/cd.
Bulletin Summary: This preliminary information communicates that you may notice a black screen on their radio display. This can happen for a period of a couple seconds or the entire ignition cycle. Engineering is aware of the issue and investigating.
Vehicles covered in this TSB:
2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2024 Chevrolet Silverado Ev, 2022 Chevrolet Suburban, 2023 Chevrolet Suburban, 2022 Chevrolet Tahoe, 2023 Chevrolet Tahoe, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2024 GMC Sierra 3500, 2022 GMC Yukon, 2023 GMC Yukon, 2022 GMC Yukon Xl, 2023 GMC Yukon Xl.

15 2024 GMC Sierra 3500 engine and engine cooling TSB (Bulletin PIT5689F)

Bulletin Date: Feb. 23, 2024
Component: Engine and engine cooling.
Bulletin Summary: This preliminary information communicates that some customers may comment that after an auto-stop event the engine does not restart and to inspect the engine ground strap. Temporarly on hold while pie0572 is active. Pie0572 has now ended a
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

16 2024 GMC Sierra 3500 lane departure: blind spot detection TSB (Bulletin PIT5744D)

Bulletin Date: Feb. 21, 2024
Component: Lane departure: blind spot detection.
Bulletin Summary: This preliminary information communicates information on how to disable the side blind zone detection and park assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

17 2024 GMC Sierra 3500 electrical system:adas:blindspot:software TSB (Bulletin PIT5744D)

Bulletin Date: Feb. 21, 2024
Component: Electrical system:adas:blindspot:software.
Bulletin Summary: This preliminary information communicates information on how to disable the side blind zone detection and park assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

18 2024 GMC Sierra 3500 electrical system:adas:blindspot:sensors TSB (Bulletin PIT5744D)

Bulletin Date: Feb. 21, 2024
Component: Electrical system:adas:blindspot:sensors.
Bulletin Summary: This preliminary information communicates information on how to disable the side blind zone detection and park assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

19 2024 GMC Sierra 3500 electrical system:adas:parking assist:software TSB (Bulletin PIT5744D)

Bulletin Date: Feb. 21, 2024
Component: Electrical system:adas:parking assist:software.
Bulletin Summary: This preliminary information communicates information on how to disable the side blind zone detection and park assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.

20 2024 GMC Sierra 3500 electrical system:adas:parking assist:sensors TSB (Bulletin PIT5744D)

Bulletin Date: Feb. 21, 2024
Component: Electrical system:adas:parking assist:sensors.
Bulletin Summary: This preliminary information communicates information on how to disable the side blind zone detection and park assist systems when a customer removes the pickup box from the vehicle to install an aftermarket bed or body.
Vehicles covered in this TSB:
2019 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 1500, 2021 Chevrolet Silverado 1500, 2022 Chevrolet Silverado 1500, 2023 Chevrolet Silverado 1500, 2024 Chevrolet Silverado 1500, 2020 Chevrolet Silverado 2500, 2021 Chevrolet Silverado 2500, 2022 Chevrolet Silverado 2500, 2023 Chevrolet Silverado 2500, 2024 Chevrolet Silverado 2500, 2020 Chevrolet Silverado 3500, 2021 Chevrolet Silverado 3500, 2022 Chevrolet Silverado 3500, 2023 Chevrolet Silverado 3500, 2024 Chevrolet Silverado 3500, 2024 Chevrolet Silverado Ev, 2019 GMC Sierra 1500, 2020 GMC Sierra 1500, 2021 GMC Sierra 1500, 2022 GMC Sierra 1500, 2023 GMC Sierra 1500, 2024 GMC Sierra 1500, 2020 GMC Sierra 2500, 2021 GMC Sierra 2500, 2022 GMC Sierra 2500, 2023 GMC Sierra 2500, 2024 GMC Sierra 2500, 2020 GMC Sierra 3500, 2021 GMC Sierra 3500, 2022 GMC Sierra 3500, 2023 GMC Sierra 3500, 2024 GMC Sierra 3500.


Also see Common problems of GMC Sierra 3500.