Service bulletins for the 2021 Chevrolet Silverado
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.
1747 on file from NHTSA, as of 2026-10-19.
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Only bulletins with type: Emissions are shown. Show all
| N232429740 | 2025-02-24. Emissions. ENGINE. Emission Recall. On certain vehicles with specific Malfunction Indicator Light (MIL) -on faults, the miles travelled calculation switches from the Transmission Output Speed Sensor (TOSS) to the Wheel Speed Sensor (WSS) and the mileage recorded by the On Board Diagnostic (OBD) System is accumulated at one-fourth actual due to an incorrectly calibrated parameter used in the calculation. Dealers will reprogram the engine control module. |
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The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.