Service bulletins for the 2021 Cadillac CT4
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.
813 on file from NHTSA, as of 2026-10-19.
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Only bulletins with component: Fuel system are shown. Show all
| 050604022R | 2020-12-07. Service bulletin. FUEL SYSTEM, DIESEL. This bulletin provides information on the TOP TIER Detergent Gasoline Licensed Brands and the TOP TIER Diesel Fuel Licensed Brands that are recommended for use in all GM vehicles and the TOP TIER FUELS website URL. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.