DERATE — truck fault codes
REMOTE · DERATE.APP
Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls.
Available components
Last scanned (1 day ago)
Scores higher than 87% of remote servers
Reachable. Last reached 4 Nov 2026.
Category IoT and Hardware
How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. How we score → Why this is hard to score →
Endpoint Security80
- The endpoint's TLS certificate is valid, in date, and uses a strong key. View diagnostics → Pass
- No authorisation is required to call this server. Every tool declares its destructiveHint and none is destructive, so open access doesn't expose one. See how to fix → View diagnostics → Partial
- HTTPS is enforced; there's no plaintext access path. View diagnostics → Pass
- The HSTS (Strict-Transport-Security) header is present. View diagnostics → Pass
- DNSSEC check failed: this domain isn't protected by DNSSEC. See how to fix → View diagnostics → Fail
Transport & Reachability100
- Verified streamable-http transport via a live MCP handshake. View diagnostics → Pass
Schema Quality & AI Usability76
- AI-judged instruction clarity (good).Pass
- Context-footprint check failed: tool/resource definitions use about 1660 tokens (~110/item across 15 items; 15 tools + 0 resources), over budget; trim descriptions and params. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management77
- Stability observed for 23 of 30 days with no destabilising changes; credit accrues until the full window elapses.Partial
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 15 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 16 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities60
- Spec-recency check failed: implements MCP spec 2025-06-18; the latest is 2026-07-28. See how to fix → Fail
Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 4 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.
- 2 Nov 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.
- 31 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 60 to 63. That category is still filling its 30-day observation window: 18 days of observed history at the previous scan, 19 at this one. The score rises as the window fills, whether or not the server changes.
- 28 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 50 to 53. That category is still filling its 30-day observation window: 15 days of observed history at the previous scan, 16 at this one. The score rises as the window fills, whether or not the server changes.
- 26 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 43 to 47. That category is still filling its 30-day observation window: 13 days of observed history at the previous scan, 14 at this one. The score rises as the window fills, whether or not the server changes.
- 24 Oct 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 37 to 40. That category is still filling its 30-day observation window: 11 days of observed history at the previous scan, 12 at this one. The score rises as the window fills, whether or not the server changes.
- 22 Oct 26 +11
- Transport: fail → pass ▲ security
- 21 Oct 26 −10
- Transport: pass → fail ▼ security
- The server rewrote its instructions, which are the text every model session reads security
- Schema quality: 1456 → 1660 ▼ functional
- Server version: 2.0.0 → 2.1.0 functional
- New tool “get_guide” functional
- New tool “search_guides” functional
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 4 Nov 2026 · Probed https://derate.app/mcp
TLS valid
Negotiated TLS 1.3 with TLS_AES_128_GCM_SHA256 .
| Subject | Issuer | Valid from | Valid until | Key | Signature | Serial |
|---|---|---|---|---|---|---|
| CN=derate.app | CN=WE1,O=Google Trust Services,C=US | 20 Oct 2026 | 18 Jan 2027 | ECDSA 256 | ECDSA-SHA256 | 2412f64aeb247c540ec85ecd64d7e19d |
| SANs: derate.app | ||||||
| CN=WE1,O=Google Trust Services,C=US (CA) | CN=GTS Root R4,O=Google Trust Services LLC,C=US | 13 Dec 2023 | 20 Feb 2029 | ECDSA 256 | ECDSA-SHA384 | 7ff31977972c224a76155d13b6d685e3 |
| CN=GTS Root R4,O=Google Trust Services LLC,C=US (CA) | CN=GlobalSign Root CA,OU=Root CA,O=GlobalSign nv-sa,C=BE | 15 Nov 2023 | 28 Jan 2028 | ECDSA 384 | SHA256-RSA | 7fe530bf331343bedd821610493d8a1b |
Background: What to check on a remote MCP endpoint →
DNSSEC insecure
Validation of derate.app. — Not signed
| Zone | DS | Keys | Algorithms | Outcome |
|---|---|---|---|---|
| . | trust_anchor | 20326, 38696 | 8, 8 | Verified |
| app. | present | 23684 | 8 | Verified |
| derate.app. | absent | Unsigned (proven) parent-signed NSEC/NSEC3 proves an unsigned delegation |
Authentication No authorisation required
The endpoint answered without asking for a token. Anyone who knows the URL can reach it.
| Result | No authorisation required |
|---|---|
| HTTP status | 200 |
| Header | Value |
|---|---|
| strict-transport-security | max-age=31536000; includeSubDomains |
| x-content-type-options | nosniff |
| referrer-policy | strict-origin-when-cross-origin |
Background: How OAuth 2.1 works in the 2026 MCP spec →
Transports 2 probes
| Transport | URL | Outcome | Status | Location |
|---|---|---|---|---|
| streamable-http | https://derate.app/mcp | Verified | 200 | |
| http (plaintext) | http://derate.app/mcp | HTTPS enforced | 301 | https://derate.app/mcp |
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
buscar_codigo Search truck fault code / Buscar código ~100
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 | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
| query | string | yes | SPN/FMI, P-code or free text. |
No output schema declared.
No examples provided.
es_seguro_manejar Is it safe to drive? / ¿Es seguro manejar? ~105
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 | Type | Req | Description |
|---|---|---|---|
| code | string | yes | e.g. 'SPN 3251 FMI 0', '3251/0', 'P20EE'. |
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
No output schema declared.
No examples provided.
explain_fault_code Explain fault code ~91
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 | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Language of the explanation: 'es' or 'en'. |
| query | string | yes | Fault code (e.g. 'SPN 3251 FMI 0'), system name or symptom text to look up. |
No output schema declared.
No examples provided.
get_data_notes Data quality notes / Notas de calidad de datos ~68
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 | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
No output schema declared.
No examples provided.
get_diagnosis Get diagnosis ~68
Return the full DERATE demo diagnosis for a truck: verdict (STOP/CAUTION/CLEAR), derate countdown, every fault code and the work order summary.
| Name | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Language of the diagnosis text: 'es' (Spanish) or 'en' (English). |
No output schema declared.
No examples provided.
get_download_links Get DERATE download links ~39
Return the official App Store and Google Play links for the DERATE native app (iOS and Android). DERATE runs only as a mobile app.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_guide Get a guide or news article / Ver guía o noticia ~84
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.
| Name | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
| slug | string | yes | Article slug, e.g. 'what-is-engine-derate'. |
No output schema declared.
No examples provided.
get_pricing Get DERATE pricing ~59
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
get_truck_fault_code Get truck fault code ~189
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 | Type | Req | Description |
|---|---|---|---|
| code | string | yes | The fault code, e.g. 'SPN 3251 FMI 0', '3251/0' or 'P2002'. |
| engine_family | string | – | Optional engine family for context, e.g. 'cummins', 'paccar-mx', 'detroit'. |
| lang | string | – | Response language: 'es' (Spanish) or 'en' (English). |
No output schema declared.
No examples provided.
interpret_derate Interpret an engine derate ~166
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 | Type | Req | Description |
|---|---|---|---|
| code | string | – | Optional fault code already known (SPN/FMI or OBD-II). |
| engine_family | string | – | Optional engine family, e.g. 'cummins'. |
| lang | string | – | Response language: 'es' (Spanish) or 'en' (English). |
| symptom | string | yes | Free-text symptom, warning light or behavior the driver observes. |
No output schema declared.
No examples provided.
list_fault_codes List fault codes ~58
List the fault codes (SPN/FMI) in the current DERATE diagnosis with severity, system, fault type and whether they are a root cause.
| Name | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Language of the labels: 'es' or 'en'. |
No output schema declared.
No examples provided.
list_supported_engine_families List supported engine families ~54
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.
Input schema present but exposes no named parameters.
No output schema declared.
No examples provided.
retiros_de_camion Truck recalls / Retiros de camión ~119
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 | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
| limit | integer | – | Maximum items. |
| make | string | – | Optional truck make, e.g. 'Volvo'. |
| query | string | – | Optional free text, e.g. a make. |
No output schema declared.
No examples provided.
search_fault_code_library Search the fault code library ~121
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 | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language: 'es' (Spanish) or 'en' (English). |
| limit | integer | – | Maximum results. |
| query | string | yes | Code or free text to search for. |
| severity | string | – | Optional severity filter: RED stop now, YELLOW caution, WHITE info only. |
No output schema declared.
No examples provided.
search_guides Search guides and news / Buscar guías y noticias ~97
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.
| Name | Type | Req | Description |
|---|---|---|---|
| lang | string | – | Response language / Idioma: 'en' or 'es'. |
| query | string | yes | Words to search for, e.g. 'derate' or 'DEF'. |
No output schema declared.
No examples provided.
How do I install the DERATE — truck fault codes MCP server?
DERATE — truck fault codes is a hosted endpoint at https://derate.app/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
remote · derate.app
claude mcp add --transport http app-derate-derate 'https://derate.app/mcp'
What is the DERATE — truck fault codes MCP server?
DERATE — truck fault codes is an MCP server listed in the public MCP registry as app.derate/derate. Heavy-duty truck SPN/FMI and OBD fault codes: meaning, safe-to-drive verdict, parts and recalls. This page covers its hosted endpoint (https://derate.app/mcp).
Is the DERATE — truck fault codes MCP server safe to use?
DERATE — truck fault codes scores 83 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the DERATE — truck fault codes MCP server expose?
DERATE — truck fault codes exposes 15 tools: buscar_codigo, es_seguro_manejar, retiros_de_camion, get_data_notes, search_guides, and 10 more. Their descriptions and schemas cost roughly 1,418 tokens of context every time the server is loaded.
Does the DERATE — truck fault codes MCP server require authentication?
No. We connected to DERATE — truck fault codes without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.
Is the DERATE — truck fault codes MCP server still maintained?
DERATE — truck fault codes is still listed as active in the MCP registry. We last reached this channel on 4 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.