Service bulletins for the 2021 Chevrolet 4500HD
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.
318 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Lighting are shown. Show all
| 02-08-42-001J | 2024-01-19. Service bulletin. EXTERIOR LIGHTING. This informational bulletin provides information for dealers/technicians on Headlamp, Tail Lamp, License Lamp or Fog/Driving Lamp Damage. |
|---|---|
| 01-08-42-001P | 2023-05-09. Service bulletin. EXTERIOR LIGHTING. This service bulletin provides information on Exterior Lamp Condensation and Water Leak Information and Replacement Guidelines. |
| 22-NA-219 | 2022-11-03. Service bulletin. EXTERIOR LIGHTING. This informational bulletin provide Information on Turn Signal Lenses Cracking. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.