TSB

📖 YOUCANIC Automotive Glossary

A TSB (Technical Service Bulletin) is an official document issued by the vehicle manufacturer to dealerships and technicians describing a known problem, its symptoms, the affected vehicles (by VIN range, production date, or model year), and the recommended repair procedure. TSBs are not recalls — they do not require the manufacturer to notify owners or perform free repairs (unless the vehicle is under warranty). However, TSBs are invaluable diagnostic resources because they document problems the manufacturer has identified and solved, often including the exact DTC, symptom description, root cause, and step-by-step repair procedure.

Before diagnosing a complex driveability problem, DIYers should search for applicable TSBs — the problem may already be documented with a known fix, saving hours of diagnostic time. TSBs are available through the manufacturer’s service information portal (some free, some paid), NHTSA.gov (free but limited detail), and various aftermarket databases. If a TSB applies to your vehicle and the issue occurs during the warranty period, the repair should be covered under warranty. The YOUCANIC UCAN-II DTC definitions may reference related TSBs for common manufacturer-specific codes.