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OBD Fault Code Index

OBD Fault Code

This page is dedicated to helping you understand and troubleshoot OBD2 fault codes!

Jump to fault codes

If you’re unfamiliar with OBD2, it stands for On-Board Diagnostics and is a system installed in modern cars to monitor their performance and detect any issues.

When your car’s OBD2 system detects a problem, it will generate a fault code, which is a unique identifier that corresponds to a specific issue. These codes can be read using an OBD2 scanner or code reader, which can help you diagnose the problem and find a solution.

Below I’ve compiled a list of common OBD2 fault codes that you may encounter. For each code, I’ve provided a brief outline of what it means.

OBD-2 fault code reader

The fault codes are accessed by connecting a handheld fault code reader to the onboard computer through the OBD port, which is usually located under the driver’s side dashboard.

If you need a crash course on reading and clearing fault codes using an OBD2 code reader, check out this link – How to use a fault code reader (video)

If you need to buy a code reader, check out this link – Fault code reader I recommend for DIYers

Common OBD2 Fault Codes

List of diagnostic trouble codes (DTCs) that mechanics and car owners frequently encounter.

Sum up

It’s important to note that while fault codes are helpful, they can sometimes be misleading, as when one system goes down, it can cause other tangentially related fault codes to set. When multiple codes are set in this way, it can lead to misdiagnosis.

Successful diagnoses will require a working knowledge of the system under diagnosis, an OBD2 code reader, and, at times, may also require a Voltmeter for circuit testing.

About the Author

This article was created with the assistance of AI technology to aid the author, John Cunningham, who is a seasoned Red Seal-certified auto technician with more than 25 years of experience in vehicle repairs. John Cunningham has edited the content to ensure accuracy and quality.

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