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
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Only bulletins with component: Driver assistance are shown. Show all
| 070601016G | 2022-06-13. Service bulletin. BACK OVER PREVENTION. This informational bulletin provides information on Internal Engine Noise or Damage After Oil Filter Replacement. |
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| 22NA012 | 2022-05-31. Service bulletin. ELECTRICAL SYSTEM:ADAS:PARKING ASSIST:SENSORS. This service bulletin provides information for dealers/technicians on Stone Chip/Membrane Damage, Broken Connector and/or Sensor Retaining Tabs, and/or Paint Damage of Park Assist Sensors. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.