Service bulletins for the 2020 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.
383 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Engine control module are shown. Show all
| 17NA050 | 2022-05-31. Service bulletin. POWER TRAIN:MANUAL TRANSMISSION:INTERNAL:SHAFT:INTERMEDIATE/LAY; ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM); FUEL SYSTEM, DIESEL. This informational bulletin explains how a health report is required when doing repairs on LCF vehicles. |
|---|
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.