Which statement about Technical Service Bulletins (TSBs) is correct?

• A. Neither
• B. A only
• C. B only
• D. Both A and B

Answer: (C)

TSBs are official notes from a vehicle manufacturer to the service network that document known problems and lay out the exact diagnostic steps and repair procedures to fix them. They’re meant to guide technicians, often including symptoms, suspected causes, step-by-step instructions, needed tools, and sometimes updated parts or service actions. They’re not recalls, and they don’t by themselves create a warranty obligation or indicate a safety-related campaign. The correct choice is the one that says only the statement describing TSBs as providing diagnostic steps and repair procedures is true. The other description doesn’t fit how TSBs function.