TSBs are manufacturer notices about known car defects — but they're not recalls. Learn the difference, why dealers never tell you about them, and how to find TSBs for your vehicle.
Your car has been making a strange noise for months. The check engine light keeps coming on, you've had it scanned twice, and the codes keep clearing without a permanent fix. The dealer says they can't reproduce the problem. You leave frustrated, and the issue returns two weeks later.
What's likely happening: your manufacturer already knows about this defect. They've documented the exact cause and fix in an internal document called a Technical Service Bulletin — and neither the service advisor nor the dealer told you it existed.
A Technical Service Bulletin (TSB) is a document issued by a vehicle manufacturer to its authorized dealers. TSBs describe known defects, common failure patterns, and the correct repair procedure. They're essentially internal repair guides for issues the manufacturer has already identified and figured out how to fix.
Unlike safety recalls, TSBs are issued by the manufacturer — not required by NHTSA or the federal government. That means there's no legal obligation for the manufacturer to notify you, fix your vehicle for free, or even acknowledge the TSB exists when you come in for service.
A recall involves a safety defect or non-compliance with a federal safety standard. The manufacturer or NHTSA issues the recall, the repair is mandatory and free, and it's all public record.
A TSB involves a known defect that may not rise to the safety threshold required for a recall — or may simply be addressed faster through a service bulletin than the formal recall process. The repair may or may not be covered under warranty. TSBs don't appear on CarFax reports.
This creates a significant information gap. You might own a vehicle with 15 known defects documented in TSBs and have no idea.
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Monitor my vehicle — $9.99/month →This is the uncomfortable reality: dealers are businesses. When you bring your car in for a routine oil change, the service department has no financial incentive to volunteer that there's a TSB for a transmission shudder you haven't complained about yet. TSB repairs may be partially covered by extended warranty campaigns, but the reimbursement rates from manufacturers are often lower than what they can charge for customer-pay repairs.
Additionally, service advisors may not proactively review TSBs for every vehicle that comes in. They respond to the symptoms you report — not the ones you haven't noticed yet.
There are a few ways to look up TSBs. The NHTSA website (nhtsa.gov) maintains a TSB database searchable by year, make, and model — though it doesn't cover every bulletin. The National Institute for Automotive Service Excellence (ASE) and several third-party sites like allDataDiy.com offer TSB lookup for a fee.
When you bring your car in for service, you can specifically ask: "Are there any Technical Service Bulletins that apply to my vehicle?" A good service advisor will check.
Consider a 2017 Honda CR-V owner experiencing rough idle and engine shudder in cold weather. Multiple shop visits, no resolution. TSB 17-082 from Honda documented an oil dilution issue with the 1.5T engine, where fuel could mix with engine oil in cold weather operation. Owners who knew about this TSB could demand the documented fix — including a software update and, in some cases, engine replacement under warranty extension. Owners who didn't know? They kept paying for diagnostics on a problem Honda already knew how to fix.
My Vin Guard tracks TSBs issued for your specific vehicle alongside recalls and NHTSA investigations. You'll receive a monthly report showing all current TSBs on record for your make, model, and year — so next time you walk into a dealer, you know exactly what to ask for.
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