🚗 Standards: SAE J2012 & ISO 15031-6 (OBD-II / EOBD) ❄️ HVAC Diagnostics: Daikin, Mitsubishi, Vaillant, Worcester, Viessmann, NIBE ⚡ Instant Decoding: Symptoms, Root Causes, Multimeter Tests & Repair Costs

About AllFaultCodes.com

AllFaultCodes.com is an independent diagnostic trouble code (DTC) reference encyclopedia designed for automotive technicians, mobile mechanics, DIY vehicle owners, and HVAC service engineers worldwide.

Core Technical Coverage

  • SAE J2012 / ISO 15031-6 OBD-II Protocols: Over 30,000 diagnostic trouble codes across Powertrain (P), Chassis (C), Body (B), and Network Communication (U).
  • HVAC, Heat Pump & Boiler Systems: Comprehensive fault code databases for leading climate manufacturers including Daikin, Mitsubishi Electric, Vaillant, Worcester Bosch, Viessmann, Carrier, Trane, and NIBE.
  • Actionable Repair Intelligence: Severity rating, safety-to-drive assessment, top 4 root causes, multimeter testing procedures, and typical repair cost estimates.