21-NA-238
Service Bulletin Details
Public Details for: 21-NA-238
This technical bulletin provides a procedure to inspect the front pump of the transmission for a possible leak.
Models from 2022
| 2022 CHEVROLET SILVERADO 2500 |
| 2022 CHEVROLET SILVERADO 3500 |
| 2022 GMC SIERRA 2500 |
| 2022 GMC SIERRA 3500 |
Models from 2021
| 2021 CHEVROLET SILVERADO 2500 |
| 2021 CHEVROLET SILVERADO 3500 |
| 2021 GMC SIERRA 2500 |
| 2021 GMC SIERRA 3500 |
Models from 2020
| 2020 CHEVROLET SILVERADO 2500 |
| 2020 CHEVROLET SILVERADO 3500 |
| 2020 GMC SIERRA 2500 |
| 2020 GMC SIERRA 3500 |
Bulletin No.: Service Bulletin 21-NA-238 Date: January, 2023 TECHNICAL Subject: Transmission Fluid Leak Near Bellhousing Area Brand: Model: Chevrolet Silverado 2500HD/3500HD GMC Sierra 2500HD/3500HD Model Year: from to 2020 2022 VIN: from to Engine: Transmission: L5P MGM, MGU Involved Region or Country North America, Australia, New Zealand. Condition Some customers may comment that a transmission fluid leak is coming from the bellhousing inspection cover. Cause This condition may be caused by the Automatic Transmission Case Front Cover Seal may be rolled or damaged Correction If the leak has been verified to be coming from the front cover seal, replace the Automatic Transmission Case Front Cover Seal and the Torque Converter Fluid Seal. Parts Information Important: Service agents must comply with all International, Federal, State, Provincial, and/or Local laws applicable to the activities it performs under this bulletin, including but not limited to handling, deploying, preparing, classifying, packaging, marking, labeling, and shipping dangerous goods. In the event of a conflict between the procedures set forth in this bulletin and the laws that apply to your dealership, you must follow those applicable laws. Service Procedure Refer to Automatic Transmission Case Front Cover Removal in SI and Torque Converter Fluid Seal Replacement in SI. Copyright 2023 General Motors LLC. All Rights Reserved. Causal Part Description Part Number Qty X SEAL, T/C FLUID 24293986 1 X SEAL AUTO TRANS FRT CASE COVER 24277112 1 N/A SEAL, TRANS FLUID CLR PIPE 84792610 1 N/A PLATE, CLU PRESS 24287670 1 N/A BOLT, TRNS MNT 11548787 2 N/A NUT, TRNS MNT 11548414 3 N/A SEAL, OUTPUT SEAL SQUARE CUT 24286193 1 N/A FLUID, AUTO TRNS ULV 19352619 (U.S.) 19352620 (Canada) 15 Page 2 January, 2023 Bulletin No.: 21-NA-238 Labor Operation Description Labor Time 8466580 Automatic Transmission Case Front Cover Seal Replacement Use the Published Labor Operations Time Warranty Information For vehicles repaired under warranty, use: Version 3 Modified Released November 09, 2021 Revised February 17, 2022 - Add 2022 to Model Year. Revised January 19, 2023 - Added Plate, Clutch Pressure and SEAL, TRANS FLUID CLR PIPE to Parts Information section. GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information. WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION