TSB: CHEVROLET SIERRA 2500, SIERRA 3500, SILVERADO 2500, SILVERADO 3500 (2020–2024)

Bulletin 21-NA-238 — January 19, 2023

Bulletin Details

Bulletin ID21-NA-238
ManufacturerCHEVROLET
ModelsSIERRA 2500, SIERRA 3500, SILVERADO 2500, SILVERADO 3500
Model Years2020–2024
Date IssuedJanuary 19, 2023
Date Added to NHTSAFebruary 28, 2024
ComponentPOWER TRAIN
Vehicles Affected92 combinations

What is a TSB?

A Technical Service Bulletin is a document issued by the vehicle manufacturer to inform dealership technicians about a known issue and the recommended repair procedure. TSBs are not mandatory recalls — they serve as repair guidance for common problems.

If your vehicle has this issue, bring this bulletin ID to your dealer. If under warranty, the repair should be covered at no cost.

Summary

This technical bulletin provides a procedure to inspect the front pump of the transmission for a possible leak.

Affected Vehicles

MakeModelYearComponent
GMC SIERRA 2500 2024 100000 POWER TRAIN
GMC SIERRA 2500 2024 100000 POWER TRAIN
GMC SIERRA 2500 2024 350000 EQUIPMENT
GMC SIERRA 2500 2024 100000 POWER TRAIN
GMC SIERRA 3500 2024 100000 POWER TRAIN
GMC SIERRA 3500 2024 100000 POWER TRAIN
GMC SIERRA 3500 2024 350000 EQUIPMENT
GMC SIERRA 3500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2024 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2024 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2024 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2024 100000 POWER TRAIN
GMC SIERRA 2500 2023 100000 POWER TRAIN
GMC SIERRA 2500 2023 350000 EQUIPMENT
GMC SIERRA 2500 2023 100000 POWER TRAIN
GMC SIERRA 2500 2023 100000 POWER TRAIN
GMC SIERRA 3500 2023 100000 POWER TRAIN
GMC SIERRA 3500 2023 100000 POWER TRAIN
GMC SIERRA 3500 2023 100000 POWER TRAIN
GMC SIERRA 3500 2023 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2023 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2023 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2023 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2023 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2023 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2023 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2023 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2023 100000 POWER TRAIN
GMC SIERRA 2500 2022 100000 POWER TRAIN
GMC SIERRA 2500 2022 350000 EQUIPMENT
GMC SIERRA 2500 2022 100000 POWER TRAIN
GMC SIERRA 2500 2022 100000 POWER TRAIN
GMC SIERRA 2500 2022 100000 POWER TRAIN
GMC SIERRA 3500 2022 100000 POWER TRAIN
GMC SIERRA 3500 2022 100000 POWER TRAIN
GMC SIERRA 3500 2022 350000 EQUIPMENT
GMC SIERRA 3500 2022 100000 POWER TRAIN
GMC SIERRA 3500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2022 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2022 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2022 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2022 100000 POWER TRAIN
GMC SIERRA 2500 2021 100000 POWER TRAIN
GMC SIERRA 2500 2021 100000 POWER TRAIN
GMC SIERRA 2500 2021 100000 POWER TRAIN
GMC SIERRA 2500 2021 350000 EQUIPMENT
GMC SIERRA 2500 2021 100000 POWER TRAIN
GMC SIERRA 3500 2021 100000 POWER TRAIN
GMC SIERRA 3500 2021 100000 POWER TRAIN
GMC SIERRA 3500 2021 350000 EQUIPMENT
GMC SIERRA 3500 2021 100000 POWER TRAIN
GMC SIERRA 3500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2021 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2021 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2021 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2021 100000 POWER TRAIN
GMC SIERRA 2500 2020 100000 POWER TRAIN
GMC SIERRA 2500 2020 100000 POWER TRAIN
GMC SIERRA 2500 2020 100000 POWER TRAIN
GMC SIERRA 2500 2020 350000 EQUIPMENT
GMC SIERRA 2500 2020 100000 POWER TRAIN
GMC SIERRA 3500 2020 100000 POWER TRAIN
GMC SIERRA 3500 2020 100000 POWER TRAIN
GMC SIERRA 3500 2020 100000 POWER TRAIN
GMC SIERRA 3500 2020 100000 POWER TRAIN
GMC SIERRA 3500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 2500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 2500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2020 350000 EQUIPMENT
CHEVROLET SILVERADO 3500 2020 100000 POWER TRAIN
CHEVROLET SILVERADO 3500 2020 100000 POWER TRAIN

Related CHEVROLET Recalls

CampaignModelYearComponentSummary
SILVERADO 3500 2019 AIR BAGS General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, ...
SILVERADO 2500 2019 AIR BAGS General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, ...
SILVERADO 1500 2018 AIR BAGS General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, ...
SILVERADO 1500 2018 AIR BAGS General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, ...
SILVERADO 2500 2019 AIR BAGS General Motors, LLC (GM) is recalling certain 2018 Chevrolet Silverado 1500, ...

What Should You Do?

If your vehicle is affected by this TSB, contact your authorized CHEVROLET dealer. Bring this bulletin ID (21-NA-238) when you visit. If under warranty, the repair should be free. If your warranty has expired, ask about goodwill coverage — manufacturers sometimes cover TSB-related repairs beyond the warranty period.

Frequently Asked Questions

A recall is a mandatory safety fix — the manufacturer must repair every affected vehicle for free. A TSB is an advisory document that describes a known issue and the recommended fix, but repairs are not required. However, some TSBs eventually lead to recalls if the issue poses a safety risk. TSBs are generally issued for quality or performance problems, while recalls address safety defects.

If your vehicle is still under the manufacturer's warranty, TSB-related repairs are typically covered at no cost. If your warranty has expired, you can ask the dealer about goodwill or customer assistance programs. Many manufacturers will cover or partially cover repairs for well-known issues, especially if the TSB was issued recently or affects a large number of vehicles.

Check the make, model, and model year listed above against your vehicle. If they match, this bulletin likely applies. However, TSBs may only affect vehicles with specific production dates, VIN ranges, or configurations. Your dealer can confirm by entering your VIN into their service system, which will show all applicable TSBs and recalls.

This data comes from the National Highway Traffic Safety Administration (NHTSA). Manufacturers are required to submit copies of all communications (including TSBs) sent to their dealers to NHTSA. The agency makes this data publicly available as part of its vehicle safety monitoring program.