Service bulletins for the 2021 GMC Sierra
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
1649 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Brake caliper are shown. Show all
| 21NA089 | 2021-05-24. Service bulletin. SERVICE BRAKES, AIR:DISC:CALIPER. This technical bulletin provides a procedure to replace the rear calipers if found packed for of mud and debris. |
|---|
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.