Service bulletins for the 2021 Cadillac XT4
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.
684 on file from NHTSA, as of 2026-10-19.
About P0451 on the 2021 Cadillac XT4: what the code means, and the bulletins and recalls about the same components.
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By component
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Only bulletins with trouble code: P0451 are shown. Show all
| 22-NA-203 | 2024-05-02. Service bulletin. FUEL SYSTEM, GASOLINE; ENGINE AND ENGINE COOLING. This technical bulletin provides a procedure to correct the condition of Check Engine Lamp Illuminated on Driver Information Center (DIC) with DTC P0451 Set. |
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| 22-NA-203 | 2022-11-02. Service bulletin. ELECTRICAL SYSTEM; FUEL SYSTEM, GASOLINE. This technical bulletin provides a procedure to correct the condition of Check Engine Lamp Illuminated on Driver Information Center (DIC) with DTC P0451 Set. |
| PIE0613B | 2021-08-09. Service bulletin. ENGINE. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards to Check Engine Lamp illuminated on the Driver Information Center (DIC) and/or poor fuel fill, DTC P0451 Set. |
The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.