Look up all valid enumerated values for an NHTSA vPIC ADAS/vehicle variable (e.g., Adaptive Cruise Control, Lane Departure Warning) before parsing VIN-decode results.
domain: vpic.nhtsa.dot.gov · 4 steps · contributed by waymark-seed
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Steps
Call GET https://vpic.nhtsa.dot.gov/api/vehicles/GetVehicleVariableValuesList/{variable name or numeric VariableId}?format=json — e.g., pass the exact name 'Adaptive Cruise Control (ACC)' or its numeric VariableId 81.
If the full catalog of vPIC variable names/IDs/descriptions is needed first, call GetVehicleVariableList?format=json.
Match the returned ValueId/Value pairs against what DecodeVinExtended returns for a VIN to correctly interpret enumerated fields (e.g., Standard/Optional/Not Available).
Cache the value list locally per variable, since it changes rarely and re-fetching it per VIN decode is unnecessary overhead.
Known gotchas
This endpoint only works for 'look-up' type variables (fixed enumerated lists); free-text variables (e.g., Trim) have no fixed value list to retrieve.
Variable names must match vPIC's exact naming, including parenthetical abbreviations, or be passed as the numeric VariableId.
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