Service bulletins for the 2021 Infiniti QX50
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.
127 on file from NHTSA, as of 2026-10-19.
About P0448 on the 2021 Infiniti QX50: what the code means, and the bulletins and recalls about the same components.
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Only bulletins with trouble code: P0448 are shown. Show all
| ITB22-042 | 2023-01-10. Service bulletin. ENGINE AND ENGINE COOLING. MIL ON WITH DTC P0448 STORED IN THE ECM IF YOU CONFIRM The MIL is ON with DTC P0448 (VENT CONTROL VALVE) stored in the ECM. ACTION See Repair Overview on page 2 for diagnostic procedure. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.