About us and how we write our code pages

DTC Codes (Códigos DTC) is a database of OBD2 diagnostic trouble codes, written first in Spanish and now available in English. Our goal is simple: a driver with the check engine light on, or a technician looking for a procedure, should find on a single page what the code means, how serious it is, what causes it and how to test it before replacing parts.

How each code page is written

1. The code definition is based on the SAE J2012 and ISO 15031-6 standards for generic codes. Manufacturer-specific codes are labeled as such.
2. Causes are listed from most to least common, based on the available technical documentation and on failure patterns known in the workshop.
3. Diagnosis always follows the same order: visual checks, live data, electrical tests and, last of all, replacing components.
4. Brand notes are only added when there is a documented typical failure for that make or engine.
5. Costs are rough ranges in US dollars. They vary a lot by country, make and shop.

Reviews and corrections

Every page shows the date of its last update. If you find a mistake or a missing cause, write to us from the contact page with the code, the vehicle and what you checked. We review every report and correct the page once it is confirmed.

What we do not do

We do not diagnose vehicles remotely and we do not replace an in-person inspection at a shop. The information is technical and meant as a guide, and it should always be checked against the service manual for your vehicle.

How the site is funded

The site is free. It is funded by the sale of premium PDF guides and, when enabled, by advertising. Neither advertisers nor manufacturers influence the content of the code pages, and we do not receive commissions for recommending parts or shops.

About the English version

The English pages are adapted from our Spanish originals rather than machine-translated word for word. Terms follow the usage common in North American workshops (for example, check engine light, gas cap, scan tool). The PDF guides are currently available in Spanish only.