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DERATE — truck fault codes

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Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls.

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buscar_codigo Read-only

Search DERATE's 56-code heavy-truck library by SPN/FMI, P-code or free text. Returns severity, derates yes/no, meaning, part and estimated part-price range, and the page URL. / Busca en la biblioteca de códigos de DERATE.

querystring, required

SPN/FMI, P-code or free text.

langstring

Response language / Idioma: 'en' or 'es'.

DERATE — truck fault codes MCP server | mcptry

Tools (15)

buscar_codigo

read-only

Argument	Type	Description
lang	string	Response language / Idioma: 'en' or 'es'.
query*	string	SPN/FMI, P-code or free text.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "query"
  ],
  "properties": {
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    },
    "query": {
      "type": "string",
      "minLength": 1,
      "description": "SPN/FMI, P-code or free text."
    }
  }
}

es_seguro_manejar

Safe-to-drive verdict (stop / service_soon / info) for a truck fault code, from DERATE's library only. Unknown codes return 'unknown'. / Veredicto de si es seguro seguir manejando.

read-only

Argument	Type	Description
code*	string	e.g. 'SPN 3251 FMI 0', '3251/0', 'P20EE'.
lang	string	Response language / Idioma: 'en' or 'es'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "code"
  ],
  "properties": {
    "code": {
      "type": "string",
      "minLength": 2,
      "description": "e.g. 'SPN 3251 FMI 0', '3251/0', 'P20EE'."
    },
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    }
  }
}

explain_fault_code

Explain a truck fault code or symptom in DERATE terms: plain-language meaning, severity, probable causes, recommended tests with expected values, repair steps and cost estimate.

read-only

Argument	Type	Description
lang	string	Language of the explanation: 'es' or 'en'.
query*	string	Fault code (e.g. 'SPN 3251 FMI 0'), system name or symptom text to look up.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "query"
  ],
  "properties": {
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Language of the explanation: 'es' or 'en'."
    },
    "query": {
      "type": "string",
      "minLength": 1,
      "description": "Fault code (e.g. 'SPN 3251 FMI 0'), system name or symptom text to look up."
    }
  }
}

get_data_notes

DERATE dataset notes: code count, sources, known gaps, license (CC BY 4.0), how to cite and download URLs. / Notas de calidad, licencia y cómo citar.

read-only

Argument	Type	Description
lang	string	Response language / Idioma: 'en' or 'es'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    }
  }
}

get_diagnosis

Return the full DERATE demo diagnosis for a truck: verdict (STOP/CAUTION/CLEAR), derate countdown, every fault code and the work order summary.

read-only

Argument	Type	Description
lang	string	Language of the diagnosis text: 'es' (Spanish) or 'en' (English).

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Language of the diagnosis text: 'es' (Spanish) or 'en' (English)."
    }
  }
}

get_download_links

Return the official App Store and Google Play links for the DERATE native app (iOS and Android). DERATE runs only as a mobile app.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

get_guide

Full text (markdown) of one DERATE guide or news article by slug, with sources and the derate.app URL to cite. / Texto completo de una guía o noticia.

read-only

Argument	Type	Description
lang	string	Response language / Idioma: 'en' or 'es'.
slug*	string	Article slug, e.g. 'what-is-engine-derate'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "slug"
  ],
  "properties": {
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    },
    "slug": {
      "type": "string",
      "minLength": 1,
      "description": "Article slug, e.g. 'what-is-engine-derate'."
    }
  }
}

get_pricing

List DERATE's plans and prices in USD. The app is a free download; plans are purchased inside the iOS/Android app (App Store / Google Play). Monthly Driver and Shop plans include a 7-day free trial for new subscribers.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

get_truck_fault_code

Look up a diesel truck fault code (J1939 SPN/FMI such as 'SPN 3251 FMI 0', or an OBD-II code such as 'P2002') in DERATE's public fault-code library. Returns what the code means, its severity, whether it is safe to keep driving, probable causes, the recommended tests, and the canonical URL of the public page for that code. Works without any account.

read-only

Argument	Type	Description
code*	string	The fault code, e.g. 'SPN 3251 FMI 0', '3251/0' or 'P2002'.
lang	string	Response language: 'es' (Spanish) or 'en' (English).
engine_family	string	Optional engine family for context, e.g. 'cummins', 'paccar-mx', 'detroit'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "code"
  ],
  "properties": {
    "code": {
      "type": "string",
      "minLength": 2,
      "description": "The fault code, e.g. 'SPN 3251 FMI 0', '3251/0' or 'P2002'."
    },
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Response language: 'es' (Spanish) or 'en' (English)."
    },
    "engine_family": {
      "type": "string",
      "description": "Optional engine family for context, e.g. 'cummins', 'paccar-mx', 'detroit'."
    }
  }
}

interpret_derate

Explain a diesel truck engine derate or power-loss symptom described in plain language (for example 'DEF light on and truck limited to 55 mph'). Returns the most likely cause, how urgent it is, the immediate action to take, and matching public fault-code pages. This is the free public interpretation; the full guided diagnosis with tests and a work order runs in the DERATE app.

read-only

Argument	Type	Description
code	string	Optional fault code already known (SPN/FMI or OBD-II).
lang	string	Response language: 'es' (Spanish) or 'en' (English).
symptom*	string	Free-text symptom, warning light or behavior the driver observes.
engine_family	string	Optional engine family, e.g. 'cummins'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "symptom"
  ],
  "properties": {
    "code": {
      "type": "string",
      "description": "Optional fault code already known (SPN/FMI or OBD-II)."
    },
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Response language: 'es' (Spanish) or 'en' (English)."
    },
    "symptom": {
      "type": "string",
      "minLength": 3,
      "description": "Free-text symptom, warning light or behavior the driver observes."
    },
    "engine_family": {
      "type": "string",
      "description": "Optional engine family, e.g. 'cummins'."
    }
  }
}

list_fault_codes

List the fault codes (SPN/FMI) in the current DERATE diagnosis with severity, system, fault type and whether they are a root cause.

read-only

Argument	Type	Description
lang	string	Language of the labels: 'es' or 'en'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Language of the labels: 'es' or 'en'."
    }
  }
}

list_supported_engine_families

List the diesel truck engine families and code protocols DERATE interprets (J1939 SPN/FMI and OBD-II), so an agent knows whether a given truck is covered before looking up a code.

read-only

No arguments.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {}
}

retiros_de_camion

How to check heavy-truck safety recalls (NHTSA-based), with per-make source links for Freightliner, Volvo, Kenworth, Peterbilt, International, Mack and Western Star. / Cómo revisar retiros de seguridad.

read-only

Argument	Type	Description
lang	string	Response language / Idioma: 'en' or 'es'.
make	string	Optional truck make, e.g. 'Volvo'.
limit	integer	Maximum items.
query	string	Optional free text, e.g. a make.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "properties": {
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    },
    "make": {
      "type": "string",
      "description": "Optional truck make, e.g. 'Volvo'."
    },
    "limit": {
      "type": "integer",
      "maximum": 7,
      "minimum": 1,
      "description": "Maximum items."
    },
    "query": {
      "type": "string",
      "description": "Optional free text, e.g. a make."
    }
  }
}

search_fault_code_library

Full-text search over DERATE's public diesel truck fault-code library by code, system, dashboard light or symptom words. Returns a list of matching entries with code, title, severity, system and the canonical public URL.

read-only

Argument	Type	Description
lang	string	Response language: 'es' (Spanish) or 'en' (English).
limit	integer	Maximum results.
query*	string	Code or free text to search for.
severity	string	Optional severity filter: RED stop now, YELLOW caution, WHITE info only.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "query"
  ],
  "properties": {
    "lang": {
      "enum": [
        "es",
        "en"
      ],
      "type": "string",
      "default": "es",
      "description": "Response language: 'es' (Spanish) or 'en' (English)."
    },
    "limit": {
      "type": "integer",
      "default": 10,
      "maximum": 50,
      "minimum": 1,
      "description": "Maximum results."
    },
    "query": {
      "type": "string",
      "minLength": 1,
      "description": "Code or free text to search for."
    },
    "severity": {
      "enum": [
        "RED",
        "YELLOW",
        "WHITE"
      ],
      "type": "string",
      "description": "Optional severity filter: RED stop now, YELLOW caution, WHITE info only."
    }
  }
}

search_guides

Search DERATE's truck-driver guides and trucking news (derate, DEF, emissions, recalls, enforcement, market). Returns title, quick answer and derate.app URL. / Busca en las guías y noticias de DERATE.

read-only

Argument	Type	Description
lang	string	Response language / Idioma: 'en' or 'es'.
query*	string	Words to search for, e.g. 'derate' or 'DEF'.

Input schema (JSON)

{
  "type": "object",
  "$schema": "http://json-schema.org/draft-07/schema#",
  "required": [
    "query"
  ],
  "properties": {
    "lang": {
      "enum": [
        "en",
        "es"
      ],
      "type": "string",
      "default": "en",
      "description": "Response language / Idioma: 'en' or 'es'."
    },
    "query": {
      "type": "string",
      "minLength": 1,
      "description": "Words to search for, e.g. 'derate' or 'DEF'."
    }
  }
}