Observed arrival · 2026-09-21
OpenDTC, for the moment your dashboard starts speaking in codes
A free lookup tool for OBD-II and manufacturer fault codes, with plain-English meanings, common causes, severity, and driving-safety context.
- For
- Drivers reading a check-engine code
- Worth noticing
- The homepage lists 66,311 codes across 48 brands, with shared-name coverage for 61 additional brands.
Field notes
The lookup accepts either a fault code or a symptom and organizes results around meaning, likely causes, seriousness, and whether driving may be safe. Its index separates standard OBD-II references from manufacturer-specific material, listing 48 brands with dedicated data and 61 additional shared-name brands. The site identifies its descriptions as a combination of SAE J2012 material and contributed diagnostic data, and explicitly disclaims manufacturer or dealer endorsement.
Observed signals
Read the marks
Editorial observations of this landing page, not a rating.
One card from the complete issue