How This Source Type Is Used
Official vs Secondary Sources matters because official, government, and OEM sources carry more weight than forums, scraped PDFs, or anonymous documents. Source records support factual fields, terminology, and conservative context.
What We Do Not Use It For
Sources are not used to copy repair procedures, reproduce tables wholesale, create OEM affiliation claims, or publish unsupported code meanings.
Indexing Rules
A page is indexable only when it has allowed review status, high or medium source confidence, known source IDs, visible metadata, FAQ, and disclaimer language.
Publishing Workflow
Explanations are written against listed sources, but build-time guards exclude pages with weak sources or risky absolute claims regardless of content quality.
Related Pages
Sources
- SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium
Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - ELD Malfunctions and Data Diagnostic Events Federal Motor Carrier Safety Administration · government · accessed 2026-05-05 · confidence high
Source: Federal Motor Carrier Safety Administration, ELD Malfunctions and Data Diagnostic Events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - 49 CFR 395.34 - ELD malfunctions and data diagnostic events Electronic Code of Federal Regulations · government · accessed 2026-05-05 · confidence high
Source: Electronic Code of Federal Regulations, 49 CFR 395.34 - ELD malfunctions and data diagnostic events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
Is Official vs Secondary Sources a repair instruction page?
No. It is an educational reference that helps drivers and fleets record useful diagnostic information before using OEM service information or a qualified technician.
Can Official vs Secondary Sources identify one failed part?
Usually no. Fault codes, symptoms, and system names point to monitored conditions. The root cause should be verified with the full code set, active status, related codes, and official diagnostic information.
What should I record when using this source page?
Record the exact message or code, active or inactive status, warning lamps, derate condition, mileage, engine hours, and any recent service or operating conditions.