Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls.
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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.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Response language / Idioma: 'en' or 'es'. | en |
| query | Yes | SPN/FMI, P-code or free text. |
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.
| Name | Required | Description | Default |
|---|---|---|---|
| code | Yes | e.g. 'SPN 3251 FMI 0', '3251/0', 'P20EE'. | |
| lang | No | Response language / Idioma: 'en' or 'es'. | en |
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.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Language of the explanation: 'es' or 'en'. | es |
| query | Yes | Fault code (e.g. 'SPN 3251 FMI 0'), system name or symptom text to look up. |
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.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Response language / Idioma: 'en' or 'es'. | en |
Return the full DERATE demo diagnosis for a truck: verdict (STOP/CAUTION/CLEAR), derate countdown, every fault code and the work order summary.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Language of the diagnosis text: 'es' (Spanish) or 'en' (English). | es |
Return the official App Store and Google Play links for the DERATE native app (iOS and Android). DERATE runs only as a mobile app.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
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.
| Name | Required | Description | Default |
|---|---|---|---|
| code | Yes | The fault code, e.g. 'SPN 3251 FMI 0', '3251/0' or 'P2002'. | |
| lang | No | Response language: 'es' (Spanish) or 'en' (English). | es |
| engine_family | No | Optional engine family for context, e.g. 'cummins', 'paccar-mx', 'detroit'. |
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.
| Name | Required | Description | Default |
|---|---|---|---|
| code | No | Optional fault code already known (SPN/FMI or OBD-II). | |
| lang | No | Response language: 'es' (Spanish) or 'en' (English). | es |
| symptom | Yes | Free-text symptom, warning light or behavior the driver observes. | |
| engine_family | No | Optional engine family, e.g. 'cummins'. |
List the fault codes (SPN/FMI) in the current DERATE diagnosis with severity, system, fault type and whether they are a root cause.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Language of the labels: 'es' or 'en'. | es |
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.
| Name | Required | Description | Default |
|---|---|---|---|
No parameters | |||
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.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Response language / Idioma: 'en' or 'es'. | en |
| make | No | Optional truck make, e.g. 'Volvo'. | |
| limit | No | Maximum items. | |
| query | No | Optional free text, e.g. a make. |
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.
| Name | Required | Description | Default |
|---|---|---|---|
| lang | No | Response language: 'es' (Spanish) or 'en' (English). | es |
| limit | No | Maximum results. | |
| query | Yes | Code or free text to search for. | |
| severity | No | Optional severity filter: RED stop now, YELLOW caution, WHITE info only. |
Recent tool additions, removals, and schema changes observed during successful MCP inspections.
buscar_codigoes_seguro_manejarexplain_fault_codeget_data_notesget_diagnosisget_download_linksget_pricingget_truck_fault_codeinterpret_deratelist_fault_codeslist_supported_engine_familiesretiros_de_camionsearch_fault_code_libraryA fault code, a VIN, or a recall — answered from public NHTSA and standards data.
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