Service bulletins for the 2020 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.
888 on file from NHTSA, as of 2026-10-19.
By type
By component
By trouble code
By topic
Only bulletins with component: Anti-lock brakes are shown. Show all
| PIT5569B | 2022-08-15. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT; SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR. This Preliminary information communicates direction and examples when diagnosing multiple DTCs, one of which includes U**** Byte 71 DTC. |
|---|---|
| N202297530 | 2022-06-13. Service bulletin. SERVICE BRAKES, AIR:ANTILOCK:WHEEL SPEED SENSOR; EQUIPMENT ADAPTIVE/MOBILITY. Service Update. Certain vehicles may experience a noise from the left front and right rear brake wear sensors during low speed or when the brake is applied lightly. Dealers are to remove pad wear sensors and install a left front and right rear plug. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.