Handling Missing PlantCode and PlantCity from vPIC Without Fake Factory Labels
NHTSA vPIC often returns plant-related fields: PlantCode , PlantCity , PlantState , and PlantCountry . When they are populated, they help users understand where a VIN pattern is associated with assembly. When they are empty, blank, or "Not Applicable," product teams feel the gap. The temptation is to invent a factory name from the eleventh VIN character, a blog post table, or a hard-coded map…
The article discusses the issue of handling missing PlantCode and PlantCity fields from the NHTSA vPIC dataset in software applications. It argues against the temptation to create fake factory labels based on the 11th VIN character or other unreliable sources, and instead recommends explicitly stating when plant data is not provided.
The author emphasizes that plant fields in DecodeVinValues-style responses are useful identifiers when present, but not a guarantee of the vehicle's assembly location or a license to fill nulls with tribal knowledge. The post provides a code example demonstrating how to model absence explicitly and clean raw input data.
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