J1939FaultCode

ast J1939 Fault Code Lookup

Only for iPhone

Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.

iPhone

Decode any J1939 fault code in seconds — SPN, FMI, DTC, brand codes and a 16,000+ signal database. 100% offline. Built for truck technicians and fleet engineers. J1939 FaultCode is a practical offline diagnostic reference tool for commercial vehicle technicians, fleet maintenance teams, and engineers. Quickly look up J1939 SPN parameters, FMI definitions, combined DTC meanings, and brand-specific fault code mappings. The app is designed for fast field use, with built-in data and no internet connection required for core lookup features. Main features: Search SPN codes by number or keyword View FMI definitions with clear explanations Query DTC combinations using SPN + FMI Check common causes and repair suggestions Browse brand-specific fault code mappings Save frequently used codes to Favorites Review recent lookup history Switch between English and Chinese Works offline after installation Whether you are troubleshooting engine, aftertreatment, fuel, sensor, electrical, or communication faults, J1939 FaultCode helps you find useful reference information quickly and consistently.

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• CAN signal database: 2,900+ messages, 16,000+ signals • Pro upgrade: ad-free + unlimited signal details

Version 1.3

The developer, 洋 刘, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .

  • Data Not Collected

    The developer does not collect any data from this app.

    Privacy practices may vary, for example, based on the features you use or your age. Learn More

    Accessibility

    The developer has not yet indicated which accessibility features this app supports. Learn More

    Information

    Seller
    • 洋 刘
    Size
    • 11.1 MB
    Category
    • Utilities
    Compatibility
    Requires iOS 16.0 or later.
    • iPhone
      Requires iOS 16.0 or later.
    • Mac
      Requires macOS 13.0 or later and a Mac with Apple M1 chip or later.
    • Apple Vision
      Requires visionOS 1.0 or later.
    Languages
    • Simplified Chinese
    Age Rating
    4+
    In-App Purchases
    Yes
    Copyright
    • © Yang Liu 2026
  • Developer Website
  • Privacy Policy

    • More by 洋 刘

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