21-NA-132
Service Bulletin Details
Public Details for: 21-NA-132
This informational bulletin provides changes to the automatic stop/start feature for certain 2021 escalade models, silverado 1500, suburban, tahoe, sierra 1500, yukon models equipped with rpo nss.
Models from 2022
Models from 2021
Bulletin No.: Service Bulletin Date: 21-NA-132 February, 2023 INFORMATION Subject: Changes to the Automatic Stop/Start Feature for Certain 2021/2022 Escalade Models, Cheyenne, Silverado 1500, Suburban, Tahoe, Sierra 1500, Yukon Models Equipped with RPO NSS Brand: Model: Cadillac Model Year: VIN: Engine: Transmission: Escalade Models 6.2L (L87) 10-Speed (MQC) Cheyenne 5.3L (L84), 6.2L (L87) 10-Speed (MQB) Silverado 1500 5.3L (L84), 6.2L (L87) 10-Speed (MQB) 5.3L (L84), 6.2L (L87) 10-Speed (MQC) Tahoe 5.3L (L84), 6.2L (L87) 10-Speed (MQC) Sierra 1500 5.3L (L84), 6.2L (L87) 10-Speed (MQB) Yukon Models 5.3L (L84), 6.2L (L87) 10-Speed (MQC) from to Chevrolet Suburban 2021 2022 GMC from to Involved Region or Country Pickup: United States, Canada, Mexico, Australia and New Zealand SUV: United States, Canada, Mexico, Middle East Additional Options (RPOs) • RPO NSS – Not Equipped with Automatic Stop/Start System • Affected vehicles will continue to include RPO KL9 – Automatic Stop/Start System, (for content which will remain) • Affected vehicles will include RPO NSS (for affected system content) 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. Beginning in June 2021, most 2021 Escalade models, Cheyenne, Silverado 1500, Suburban, Tahoe, Sierra 1500, Yukon models equipped with L84 or L87 with MQB or MQC 10-speed transmissions will be produced without the Automatic Stop/Start feature. Copyright 2023 General Motors LLC. All Rights Reserved. Pickup and SUV models equipped with L84 or L87 with MQB or MQC which are produced without Automatic Stop/Start function will be identified with New RPO NSS (Not Equipped with Automatic Stop/Start). Considerations for Diagnosing Base Engine or Electrical Wiring Concerns Certain system components related to Automatic Stop/ Start (KL9) will be unchanged in vehicles equipped with NSS: T19 - Multifunction Power Supply Converter, Starter Motor, Battery, Wiring and Connectors. For vehicles equipped with NSS, the Automatic Stop/Start disable switch will not be present, the instrument cluster will no longer show “Auto Stop,” and some internal transmission components have been omitted from the vehicle. The transmission will not be capable of the Automatic Stop/Start function. Page 2 February, 2023 Bulletin No.: 21-NA-132 When diagnosing and repairing transmission, engine, or electrical concerns on NSS equipped vehicles, which may be related to Automatic Stop/Start related hardware. DTCs related to the Stop/Start system may still be enabled. Utilize appropriate diagnostics within SI and replace any needed components as directed. No changes will occur to Automatic Stop/Start related components, except as noted. Version 3 Modified Released June 09, 2021 Revised October 29, 2021 – Revising to add Cheyenne in the Subject and under Information and revised information under Considerations for Diagnosing Base Engine or Electrical Wiring Concerns. Revised February 10, 2023 — Added the 2022 Model Year. 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