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We fixed a startup crash that could close the app right after opening it. The app now launches reliably. Thanks for your patience — and keep the feedback coming!
Offline OBD2 DTC reference. Look up fault codes, plain explanations & causes.
Auto Codes is an offline reference for OBD-II diagnostic trouble codes (DTC). Over 15,000 codes in your pocket, working without internet. Check Engine light on, or a scanner or mechanic gave you a code you don't understand? Type it in (e.g. P0420, C1234, or U0100) and instantly see a plain-language explanation, likely causes, and the code category. WHEN IT HELPS • The Check Engine light just came on • Your scanner or ELM327 adapter shows a code with no explanation • A workshop named a code and you want to check it yourself • Before buying a used car — understand what the stored faults mean • On the road or in the garage with no internet WHAT THE APP DOES • A database of 15,000+ OBD-II codes: generic (P0xxx) and manufacturer-specific (P1xxx), plus C / B / U • Search by code or keyword • Browse P / C / B / U categories (powertrain, chassis, body, network) • Plain-language summaries and likely causes • Favorites for codes you check often • Optional Google and YouTube links for further research (internet required) INTERFACE & CONTENT LANGUAGES English, Українська, Español, Português, Deutsch, Français, Polski, Русский, Italiano, Türkçe. The app works alongside scanners and OBD2 adapters (ELM327 and compatible) — just enter the code they show and get the breakdown. WHAT THE APP DOES NOT DO This is not an OBD2 scanner and does not connect to your vehicle. It does not read codes from your car’s ECU — you enter the code yourself from your scan tool or workshop report. IMPORTANT Information is provided for general reference only and does not replace professional diagnosis or repair. Always use your own judgment before driving or servicing your vehicle.