MCPFax Vehicle Fault Codes

Find official NHTSA-hosted manufacturer service-bulletin summaries that explicitly mention a code, most recent first. A mention is not proof that the bulletin applies to a particular vehicle; supply applicability filters when known. The response always states total, truncated and nextOffset: page with offset to reach every match rather than assuming the first page is all there is. make and model accept either vocabulary spelling and ignore punctuation (F-150 and F150 are the same model); call list_catalog_vocabulary to enumerate accepted values. PRICE: $0.02 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when at least one bulletin is returned. An empty page - including a page emptied by your own make/model/year filters - is a complete, correct answer and costs $0. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.

Return the source, license, URL, required notice, and build role for every diagnostic catalog input. PRICE: free. A tenant API key covers it under subscription, and it is free to anonymous x402 callers too — it is either a licence notice or the probe that tells you whether an empty answer can be trusted.

Probe the catalog database and report whether it holds data. Every catalog tool returns an empty list with success against an unimported database, so an empty result is only trustworthy when this reports ready. Call it once before concluding that the catalog does not have something. PRICE: free. A tenant API key covers it under subscription, and it is free to anonymous x402 callers too — it is either a licence notice or the probe that tells you whether an empty answer can be trusted.

Enumerate the exact vehicle names the catalog stores, so a filter can be built instead of guessed. The definition catalog and the bulletin corpus carry two separate manufacturer vocabularies: dtc_definitions has 30 makes and says CHEVY; bulletin_applicability has 862 makes that appear on at least one service bulletin and says CHEVROLET. Both tools accept either spelling, but only these values are stored. PRICE: $0.005 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when at least one stored value is returned. An empty list costs $0. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.

Return source-attributed generic and make-specific definitions for a five-character P/B/C/U code. A missing severity is intentional; the catalog does not invent severity or repair advice. Supply make whenever it is known: chassis and manufacturer-specific codes are scheme-dependent, and the returned schemeAdvisory names which numbering scheme the description follows and whether a different one may apply to the vehicle. make accepts either vocabulary spelling (CHEVY or CHEVROLET); call list_catalog_vocabulary to enumerate the accepted values. When the catalog has no definition, observations carries the code's real appearances in official documents instead of an empty answer. PRICE: $0.005 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when the catalog returns a definition OR document evidence. A real code with neither - and 77% of syntactically valid codes have neither - is answered in full and costs $0. A code with no definition but real document mentions (C1391 has 321) IS a billable answer: 'no definition exists, and here is where this code actually appears' is a fact you did not have. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.

Return source-linked J1939 SPN or SPN/FMI observations without presenting them as complete definitions. PRICE: $0.005 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when at least one observation is returned. No observations costs $0. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.

Return typed, source-linked observations for extended SAE/UDS-style or OEM-native identifiers. These rows preserve what a source printed; they do not invent an identifier meaning. PRICE: $0.005 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when at least one observation is returned. No observations costs $0. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.

Search bounded, source-attributed DTC definitions by description text or by DTC code. Code tokens such as P0420 are matched against the code column directly, because the full-text index does not index codes and no description contains its own code. Each hit reports matchedOn. A code that returns no hit here is genuinely absent from the definition catalog; lookup_dtc will then report any official-document evidence that exists for it. PRICE: $0.005 USDC per call for an anonymous x402 caller; covered by subscription under a tenant API key. Charged only when the search returns at least one hit. Zero hits is a complete, correct answer and costs $0. A repeat of the same request on the same surface under the same payment authorization is free for 24 hours; values equal to this tool's own defaults do not make it a different request.