DERATE — truck fault codes
Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls.
Connect it
Settings → Connectors → Add custom connector
URL: https://derate.app/mcpSettings → Apps & Connectors → Advanced → Developer mode
Create connector with URL: https://derate.app/mcp{
"mcpServers": {
"derate": {
"url": "https://derate.app/mcp"
}
}
}claude mcp add --transport http derate https://derate.app/mcp{
"servers": {
"derate": {
"type": "http",
"url": "https://derate.app/mcp"
}
}
}13 tools, verified live
buscar_codigoread-onlySearch 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.
es_seguro_manejarread-onlySafe-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.
retiros_de_camionread-onlyHow 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.
get_data_notesread-onlyDERATE 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.
get_truck_fault_coderead-onlyLook 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.
interpret_derateread-onlyExplain 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.
search_fault_code_libraryread-onlyFull-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.
list_supported_engine_familiesread-onlyList 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.
get_pricingread-onlyList 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.
get_download_linksread-onlyReturn the official App Store and Google Play links for the DERATE native app (iOS and Android). DERATE runs only as a mobile app.
get_diagnosisread-onlyReturn the full DERATE demo diagnosis for a truck: verdict (STOP/CAUTION/CLEAR), derate countdown, every fault code and the work order summary.
list_fault_codesread-onlyList the fault codes (SPN/FMI) in the current DERATE diagnosis with severity, system, fault type and whether they are a root cause.
explain_fault_coderead-onlyExplain 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.
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