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Fault Codes

Fault codes, also known as diagnostic trouble codes (DTCs), are stored in a car’s onboard computer when a sensor or system in the vehicle detects a problem. These codes can indicate issues with the engine, transmission, emissions, or other systems. To check for fault codes, a diagnostic scanner tool is required to be connected to the car’s onboard diagnostic (OBD) port, which is usually located under the dashboard on the driver’s side. Once connected, the scanner tool can read the codes and display them on the screen. Some advanced scanners can also provide additional information such as freeze frame data and live data.

Reading codes from vehicle control modules refers to the process of using a diagnostic tool to access the on-board computer systems in a vehicle and retrieve stored or active or current trouble codes. These codes can indicate issues with various systems and components, such as the engine, transmission, and emissions systems. By reading the codes, a mechanic or technician can quickly identify and diagnose problems with a vehicle, allowing for more efficient repairs.

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© 2015-2023 YOUCANIC® All rights reserved. YOUCANIC® offers automotive guides and practical solutions to help car owners. While we strive for accuracy, we can't guarantee our information is free from errors, omissions, or oversights. Our content is for educational purposes only and does not replace professional advice. By using YOUCANIC®, you agree to our Privacy Policy and Terms of Service. We participate in affiliate programs with Amazon, Advance Auto Parts, and eBay, and may earn a commission on purchases made through our site. Please consult a professional before making decisions based on our content. For further assistance, contact our Customer Service team.

  • HOME
  • SCANNER
    • Learn More
    • Buy Now
    • Adapters
      • 12+8 FCA Chrysler Dodge
      • BMW 20 Pin Adapter
      • Mercedes 38 Pin Multiplexer
  • VIDEOS
  • VEHICLES
  • REPAIR MANUALS
  • RESOURCES
    • SERVICE
    • VIN Decoder
    • DTC Fault Codes
    • Glossary
  • SUCCESS STORIES
  • SUPPORT
  • FORUM
  • CONTACT US
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