Technical Service Bulletins
TSBs are notices issued by manufacturers to dealerships describing known issues and recommended fixes. Unlike recalls, TSBs are not mandatory — but they often reveal important safety-related patterns.
Why TSBs Matter for Autonomous Vehicle Safety
Technical Service Bulletins are one of the most underappreciated data sources in vehicle safety research. While recalls get headlines and consumer complaints represent the voice of drivers, TSBs represent what manufacturers themselves acknowledge as problems — issues they know exist and have developed fixes for, but haven't deemed serious enough for a formal recall.
For autonomous driving systems, TSBs are particularly revealing. They often address the kinds of edge cases that make self-driving technology so challenging: phantom braking under overpasses, sensor calibration drift, camera occlusion in bad weather, and unexpected system disengagements on highway curves.
A manufacturer that issues many TSBs may be more transparent about known issues — or it may have more problems. Either way, TSBs provide valuable signal about the real-world challenges facing autonomous driving technology.
⚠️ Data Integration In Progress
We're working on integrating NHTSA's full TSB database for autonomous driving systems. In the meantime, you can search TSBs directly on NHTSA's website.
Search NHTSA TSB Database →TSBs vs. Recalls: A Side-by-Side Comparison
| Characteristic | TSB | Recall |
|---|---|---|
| Mandatory? | No — advisory only | Yes — legally required |
| Owner Notification | Not required | Required by law |
| Repair Cost | May not be free | Always free |
| Who Initiates | Manufacturer only | Manufacturer or NHTSA |
| Severity | Known issues, not necessarily safety-critical | Unreasonable safety risk |
| AV/ADAS Examples | Sensor calibration, software tuning | Phantom braking, FSD failures |
What Are TSBs?
TSB vs. Recall
Recalls are mandatory safety fixes. TSBs are optional — manufacturers notify dealers of known issues, but owners aren't always informed.
Why They Matter for AV Safety
TSBs often precede recalls. A pattern of TSBs for phantom braking or sensor issues can signal a systemic problem before NHTSA opens a formal investigation.
How to Use Them
If you own a vehicle with ADS/ADAS, check for TSBs regularly. Dealerships may apply fixes for free even though they're not required to.
AV-Specific TSBs
TSBs for Autopilot, FSD, Cruise, and Waymo systems often address software calibration, sensor alignment, and edge-case behavior improvements.
The TSB Lifecycle: From Issue to Resolution
Issue Identification
The manufacturer identifies a pattern of problems through warranty claims, internal testing, dealer feedback, or consumer complaints. For AV systems, this often involves analyzing telemetry data from fleet vehicles.
Fix Development
Engineers develop a repair procedure or software update to address the issue. For AV software, this might involve retraining neural networks, adjusting sensor fusion algorithms, or modifying control logic.
TSB Publication
The manufacturer publishes the TSB to its dealer network, describing the symptoms, affected vehicles, diagnostic steps, and repair procedure. The TSB is also filed with NHTSA and becomes part of the public record.
Dealer Implementation
When an affected vehicle visits a dealer (for any reason), the technician may apply the TSB fix. For Tesla, many TSB fixes are applied via OTA update, bypassing the dealer entirely.
Notable AV/ADAS-Related TSBs
Tesla Autopilot — Forward Collision Warning Sensitivity Calibration
Addresses FSD Beta false positive FCW alerts causing unnecessary braking events.
Tesla — Autosteer Disengagement at Highway Speeds
Software update to address unexpected Autosteer disengagement on highway curves.
Tesla — Phantom Braking Under Overpasses
Camera vision system misinterpretation of overhead structures triggering emergency braking.
Tesla FSD Beta — Intersection Navigation Improvements
Updated path planning for unprotected left turns at intersections.
GM Cruise — Lidar Sensor Recalibration
Lidar alignment procedure after post-incident analysis revealed sensor drift.
Waymo — Pedestrian Detection Edge Cases
Improved detection algorithms for pedestrians in low-light crosswalk scenarios.
Tesla — Regenerative Braking Interaction with Autopilot
Addresses unexpected deceleration when regen braking activates during Autopilot cruise.
Tesla — Camera Obstruction Detection Enhancement
Improved alerts when camera occlusion (rain, fog, glare) degrades Autopilot performance.
Frequently Asked Questions
What is a Technical Service Bulletin (TSB)?
A Technical Service Bulletin is a document issued by a vehicle manufacturer to its dealer network describing a known issue and the recommended repair procedure. Unlike recalls, TSBs are not mandatory — dealers are informed of the issue but owners may not be directly notified.
How are TSBs different from recalls?
Recalls are mandatory safety actions: manufacturers must notify every affected owner and fix the problem for free. TSBs are advisory — they tell dealers about known issues but don't require owner notification or free repairs. However, TSBs often address the same types of problems that eventually become recalls.
Why do TSBs matter for autonomous vehicle safety?
TSBs often serve as early warning signs. A pattern of TSBs addressing phantom braking, sensor calibration, or software glitches can indicate a systemic problem before NHTSA opens a formal investigation. Monitoring TSBs gives researchers and consumers advance notice of emerging safety concerns.
How can I find TSBs for my vehicle?
You can search for TSBs on NHTSA's website at nhtsa.gov under the Technical Service Bulletins section. Enter your vehicle's make, model, and year to see relevant bulletins. You can also ask your dealer — they have access to the full TSB database for their brand.
Are TSB repairs free?
Not always. Unlike recalls, TSB repairs are not required to be free. However, many dealers will perform TSB-related repairs at no charge, especially if the vehicle is under warranty. Some manufacturers have goodwill programs that cover TSB repairs even after warranty expiration if the issue is widespread.
Can a TSB become a recall?
Yes. If a TSB addresses a safety-related issue that NHTSA determines creates an unreasonable risk, the agency can require the manufacturer to issue a formal recall. Many AV/ADAS recalls started as TSBs — the phantom braking issue, for example, was addressed in multiple TSBs before NHTSA's formal investigation.
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