WhichTrim vehicle records

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US vehicle recalls, complaints, EPA figures, VIN decode and trouble codes, with sources.

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check_recalls Read-only

Every NHTSA recall campaign on file for one model year, with severity, park-outside and do-not-drive advisories and the reported completion rate. IMPORTANT: recalls apply to a build range, not to a model year, so this cannot establish whether one specific vehicle is affected — only a VIN check at nhtsa.gov/recalls can.

idstring, required

Vehicle id, e.g. 2021_kia_telluride.

Tools (9)

check_recalls

read-only

Argument	Type	Description
id*	string	Vehicle id, e.g. 2021_kia_telluride.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Vehicle id, e.g. 2021_kia_telluride."
    }
  }
}

compare_vehicles

Two model years side by side on the figures that decide most purchases: fuel economy or EV range, Safety Signal grade, recalls, complaints, crash rating and starting price where a press kit is on file.

read-only

Argument	Type	Description
a*	string	Vehicle id for the first car, e.g. 2021_kia_telluride. Get one from search_vehicles.
b*	string	Vehicle id for the second car, e.g. 2021_honda_pilot. Get one from search_vehicles. Must be a different id from `a`.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "a",
    "b"
  ],
  "properties": {
    "a": {
      "type": "string",
      "description": "Vehicle id for the first car, e.g. 2021_kia_telluride. Get one from search_vehicles."
    },
    "b": {
      "type": "string",
      "description": "Vehicle id for the second car, e.g. 2021_honda_pilot. Get one from search_vehicles. Must be a different id from `a`."
    }
  }
}

decode_vin

Decode a 17-character VIN against NHTSA's vPIC database and join it to the WhichTrim record for that model year: year, make, model, engine, plant, plus the grade and recall campaigns on file.

read-only

Argument	Type	Description
vin*	string	A 17-character VIN.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "vin"
  ],
  "properties": {
    "vin": {
      "type": "string",
      "description": "A 17-character VIN."
    }
  }
}

federal_cases

Federal lawsuits in the RECAP docket index (CourtListener, Free Law Project) that name a vehicle's manufacturer as a party and mention the model and a vehicle system — product-liability, warranty, lemon-law and class cases, newest first, with court, filing date, docket number, nature of suit and a link to each docket. Asked nightly by WhichTrim's build and cached, so the answer is as the index stood on the date given. A docket's presence says nothing about merits or outcome; state-court cases are not indexed.

read-only

Argument	Type	Description
make*	string	The make, e.g. hyundai, ford, chevrolet.
model*	string	The model, e.g. sonata, f-150, silverado.
system	string	Optional vehicle system slug to narrow to: engine, power-train, air-bags, electrical-system, steering, service-brakes, fuel-system, forward-collision-avoidance, suspension, structure. Without it, every system on file is answered.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "make",
    "model"
  ],
  "properties": {
    "make": {
      "type": "string",
      "description": "The make, e.g. hyundai, ford, chevrolet."
    },
    "model": {
      "type": "string",
      "description": "The model, e.g. sonata, f-150, silverado."
    },
    "system": {
      "type": "string",
      "description": "Optional vehicle system slug to narrow to: engine, power-train, air-bags, electrical-system, steering, service-brakes, fuel-system, forward-collision-avoidance, suspension, structure. Without it, every system on file is answered."
    }
  }
}

get_trims

Every trim of one model year as the manufacturer's own press kit states it: name, powertrain, drivetrain and MSRP, each trim's headline specs, which equipment is standard on which trims, and the warranty. Pass `trim` for one trim's full specification sheet (engine, dimensions, cargo, weights, brakes, wheels, tires) and its standard and optional equipment, with what it adds over the cheapest trim. Only model years with a press kit on file have trims — search_vehicles marks them.

read-only

Argument	Type	Description
id*	string	Vehicle id, e.g. 2026_toyota_rav4. Get one from search_vehicles.
trim	string	Optional. One trim, named as the manufacturer prints it ('XLE Premium', 'SEL AWD', 'LE hybrid'), or a trim id from an earlier answer. Leave it out for every trim side by side.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Vehicle id, e.g. 2026_toyota_rav4. Get one from search_vehicles."
    },
    "trim": {
      "type": "string",
      "description": "Optional. One trim, named as the manufacturer prints it ('XLE Premium', 'SEL AWD', 'LE hybrid'), or a trim id from an earlier answer. Leave it out for every trim side by side."
    }
  }
}

get_vehicle

The full published record for one model year: EPA fuel economy, NHTSA recalls, owner-complaint counts and the mileage at which owners reported problems, crash ratings, open investigations, service bulletins and the diagnostic trouble codes its record names.

read-only

Argument	Type	Description
id*	string	Vehicle id, e.g. 2021_kia_telluride. Get one from search_vehicles.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "id"
  ],
  "properties": {
    "id": {
      "type": "string",
      "description": "Vehicle id, e.g. 2021_kia_telluride. Get one from search_vehicles."
    }
  }
}

lookup_bulletin

A manufacturer service bulletin, service campaign, warranty extension or over-the-air notice by the number on the letter or the document (Hyundai 9D6, Kia SC199, '26-01-068H TSB', GM N262570770). Returns what NHTSA's summary says, the model years it names, every document filed under it with a verified link to NHTSA's PDF where one exists, and the page URL. These are NOT safety recalls — the answer says so.

read-only

Argument	Type	Description
make	string	The make, if known (hyundai, chevrolet). A number filed under several makes returns each without it.
number*	string	The number as printed: a campaign id (9D6, SC199) or a bulletin/document number (26-01-068H, T-SB-0141-26, 00-03-10-002J).

Input schema (JSON)

{
  "type": "object",
  "required": [
    "number"
  ],
  "properties": {
    "make": {
      "type": "string",
      "description": "The make, if known (hyundai, chevrolet). A number filed under several makes returns each without it."
    },
    "number": {
      "type": "string",
      "description": "The number as printed: a campaign id (9D6, SC199) or a bulletin/document number (26-01-068H, T-SB-0141-26, 00-03-10-002J)."
    }
  }
}

lookup_trouble_code

What a diagnostic trouble code (P0420, U0100, …) means where the OBD-II standard defines it, and — the part no other source publishes — which vehicles' federal record actually names it: how many manufacturer service bulletins and owner complaints mention it, and on which model years.

read-only

Argument	Type	Description
code*	string	A trouble code, e.g. P0420.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "code"
  ],
  "properties": {
    "code": {
      "type": "string",
      "description": "A trouble code, e.g. P0420."
    }
  }
}

search_vehicles

Find model years in the WhichTrim catalogue by make, model and/or year. Returns each match with its Safety Signal grade, recall count and page URL. Use this first to get the vehicle id that the other tools take.

read-only

Argument	Type	Description
year	integer	Restrict to one model year.
limit	integer	Maximum results (default 10, max 40).
query*	string	Make and/or model, e.g. 'kia telluride' or 'rav4'.

Input schema (JSON)

{
  "type": "object",
  "required": [
    "query"
  ],
  "properties": {
    "year": {
      "type": "integer",
      "description": "Restrict to one model year."
    },
    "limit": {
      "type": "integer",
      "description": "Maximum results (default 10, max 40)."
    },
    "query": {
      "type": "string",
      "description": "Make and/or model, e.g. 'kia telluride' or 'rav4'."
    }
  }
}