Service bulletins for the 2026 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.
90 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
Only bulletins with component: Engine are shown. Show all
| N252519310 | 2025-08-26. Service campaign. ENGINE. Certain vehicles listed above, may have a condition in which the torque on the engine thermostat housing fasteners is low. Dealers will inspect for engine cooling system leaks originating at the thermostat housing. If a leak is present the thermostat housing gasket and seal will be replaced, fasteners secured to correct torque and coolant system refilled. If leak does not exist, torque fasteners to the 10Nm. |
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| 15-NA-010 | 2025-07-07. Service bulletin. ENGINE. This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California smog inspection or smog inspection in other states. |
| 25-NA-100 | 2025-06-12. Service bulletin. ENGINE. This warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and register their vehicle in a California Emission State may be entitled to the 7 year, 70,000-mile Emission Select State Component Limited Warranty. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.