DOT Inspection Requirements, Plainly

The direct answer: commercial vehicles with a GVWR/GVW over 10,000 pounds operating in interstate commerce must pass a periodic (commonly “annual DOT”) inspection at least once every 12 months, performed by a qualified inspector, with documentation kept and proof carried on or with the vehicle. The governing rules are FMCSA's 49 CFR Part 396 (specifically 396.17–396.25 and Appendix A to Part 396).

Who needs it

• Trucks, tractors, and trailers over 10,000 lbs GVWR in interstate commerce — trailers included; each unit of a combination needs its own inspection
• Intrastate-only California carriers live primarily under state programs (see the BIT program guide) — many fleets are subject to both

What the inspection covers

Appendix A to Part 396 lists the components: brake systems, coupling devices, exhaust and fuel systems, lighting, steering, suspension, frame, tires, wheels and rims, windshield/wipers, and more. In practice, brakes dominate roadside results: in CVSA’s 2025 International Roadcheck, brake systems were the largest vehicle out-of-service category (24.4%), and together with the separate defective-brakes category accounted for about 41% of vehicle out-of-service violations. Our air-loss guide covers the failure most likely to fail you.

Who may perform it (49 CFR 396.19)

A “qualified inspector” — someone who understands the Part 393 and Appendix A criteria, can identify defective components, has mastered the methods and tools, and either completed a federal- or state-sponsored training program (or holds a state or Canadian provincial certificate) or has at least one year of combined training or experience, such as work as a mechanic or inspector in a carrier maintenance program or a commercial garage (396.19(a)). Brake work and brake inspections carry their own qualification rule (396.25). There is no federal facility license and no public federal registry of inspectors: the carrier is responsible for using qualified people and keeping evidence of their qualification. Ask any shop — including us — who performs their inspections and how they're qualified.

Records

• Documentation on the vehicle: the inspection report itself, or a sticker or decal based on it showing the inspection date, where the report is kept, the vehicle’s identification and a certification that it passed (396.17(c))
• The original or a copy of the inspection report kept for 14 months from the report date, where the vehicle is housed or maintained (396.21(b))
• Evidence of the inspector’s qualifications kept by the motor carrier for as long as that person performs its annual inspections, plus one year (396.19(b))

Annual DOT vs roadside inspections

The periodic inspection is scheduled maintenance-side compliance. Roadside inspections (CVSA levels) happen at scales and stops regardless — passing your annual doesn't immunize a truck with an active defect. The trucks that sail through roadside checks are the ones maintained like it; see preventive maintenance.

Common questions

Does a brand-new truck need one?

Yes — new doesn’t exempt. Under 396.17(c) a carrier may not operate a commercial vehicle unless it has passed a periodic inspection within the preceding 12 months and documentation is on the vehicle, so a new unit needs that documentation before it goes into service. FMCSA’s interpretive guidance allows a dealer that meets the inspection requirements to provide it — ask for it at delivery.

Can I do my own annual inspection?

A carrier may use its own qualified inspector — the qualification and documentation requirements still apply, and so does the liability for getting it wrong. Most owner-operators sensibly outsource it.

What happens if a violation is found during the annual?

It gets fixed before the vehicle is certified — that's the point. Doing inspection and repair in the same shop (as we do) means findings become same-visit repairs instead of a second appointment. See our DOT inspection service.

Regulatory information is provided for general guidance, is not legal advice, and reflects our reading of the cited sources as of the last-reviewed date. Requirements change — verify against the primary source or ask us. Pro Truck Services is an independent repair shop, not a government agency.

Getting ready for one? Use the printable DOT inspection prep checklist.