ADAS Functionality and Integrity Act
Sponsored By: Representative Harshbarger, Diana [R-TN-1]
In Committee
Summary
This bill would direct the Secretary of Transportation, through NHTSA, to develop national guidelines to ensure ADAS functionality after vehicle modification. It would define allowable modification ranges, set calibration and testing procedures, and link noncompliance to civil penalties.
Show full summary
- Owners and drivers of model year 2028 and later passenger vehicles would get clear, quantifiable tolerance thresholds, calibration steps, and confirmatory test protocols that owners and service providers can use to verify ADAS performance after repairs or customizations.
- Vehicle manufacturers would have to provide vehicle tolerance and system sensitivity information to owners and the Administrator within 30 days of a vehicle's release and would face civil penalties under 49 U.S.C. § 30165(a) if they fail to meet the guidelines.
- NHTSA would be authorized to contract with independent testing labs to develop and validate the standards and would complete a 12-month study and report to Congress that includes outreach to manufacturers, the independent aftermarket, dealers, and standards organizations.
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Bill Overview
Analyzed Economic Effects
3 provisions identified: 2 benefits, 1 costs, 0 mixed.
Rules to keep driver-assist working
If enacted, NHTSA would have 24 months to publish guidelines to keep ADAS and related vehicle dynamic systems working after modifications for model year 2028 and later. The guidelines would set allowable modification ranges and tolerances for ride height, wheel and tire dimensions, overall geometry, physical displacement, and sensor and camera function. Manufacturers would need to provide vehicle tolerance and system sensitivity information to owners and to NHTSA within 30 days after a vehicle's release. The rules would define quantifiable thresholds for vertical, longitudinal, and lateral changes, set calibration procedures after repair or replacement, and include confirmatory test protocols and validation metrics repair shops and owners can use. NHTSA could hire independent labs to run tests and must base decisions on empirical dynamic testing, independent research, and public data. The guidelines would reference or expand NCAP methods and include a standardized scoring scale and transparent validation criteria.
Study on ADAS for 2028 and later
If enacted, the Department of Transportation would require NHTSA to finish a study within 12 months. The study would assess safety, feasibility, capability, and the cost to develop and keep industry guidelines for ADAS on passenger vehicles model year 2028 and later. It would review vehicle tolerances and system sensitivity, allowable modification ranges (ride height, wheel and tire sizes, geometry, displacement, and sensors/cameras), quantifiable vertical/longitudinal/lateral thresholds, calibration steps, and confirmatory test methods. NHTSA would consult manufacturers, standards organizations, the independent aftermarket, and dealers while doing the study.
Manufacturers face fines for noncompliance
If enacted, any manufacturer that does not meet the ADAS modification ranges and tolerances guidelines would be subject to civil penalties under existing federal law. The penalty exposure would attach once NHTSA issues the required guidelines.
Sponsors & CoSponsors
Sponsor
Harshbarger, Diana [R-TN-1]
TN • R
Cosponsors
Obernolte
CA • R
Sponsored 12/12/2025
Rep. Vasquez, Gabe [D-NM-2]
NM • D
Sponsored 12/12/2025
Rep. Torres, Norma J. [D-CA-35]
CA • D
Sponsored 12/12/2025
Rep. Mackenzie, Ryan [R-PA-7]
PA • R
Sponsored 3/27/2026
Roll Call Votes
No roll call votes available for this bill.
View on Congress.gov