Service bulletins for the 2020 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.
1990 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
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Only bulletins with component: Engine are shown. Show all
| 17NA374 | 2019-07-29. Service bulletin. ENGINE. This informational bulletin advises the technician of how the Soot information has changed from grams to percentage. |
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| 16NA376 | 2019-07-29. Service bulletin. ENGINE; EQUIPMENT. This informational bulletin provides information on higher than expected oil consumption. |
| PIP5656 | 2019-07-08. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary Information communication advises the technician that the 6.6L Engine (RPO L8T) has been placed on Engine Exchange program. Dealer will need to contact General Motors Product Quality Center for further assistance. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.