DERATE — truck fault codes
Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls.
| Endpoint | https://derate.app/mcp (streamable-http) |
|---|---|
| Registry version | 2.0.0 |
| Now | 15 tools · grade A (91) · pin ts_57b58a4f4d636b0dbd373adb613677cb · protocol 2025-06-18 |
| First / last listed | 2026-10-24 18:28 UTC / 2026-10-24 18:28 UTC |
| Grade over time | 2026-10-24: A (91), 15 tools |
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Tools: buscar_codigo es_seguro_manejar retiros_de_camion get_data_notes search_guides get_guide get_truck_fault_code interpret_derate search_fault_code_library list_supported_engine_families get_pricing get_download_links get_diagnosis list_fault_codes explain_fault_code
buscar_codigo | 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. params: query*, lang |
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. params: code*, lang |
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. params: query, make, limit, lang |
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. params: lang |
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. params: query*, lang |
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. params: slug*, lang |
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. params: code*, engine_family, lang |
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. params: symptom*, code, engine_family, lang |
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. params: query*, severity, limit, lang |
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. params: none |
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. params: none |
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. params: none |
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. params: lang |
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. params: lang |
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. params: query*, lang |
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