The short version
Federal rules do not require a government license or a specific national certificate to perform the periodic inspection required by 49 CFR 396.17. They require a qualified inspector, defined in 49 CFR 396.19, working for either the motor carrier or a business the carrier chooses as its agent. The carrier must be able to prove the inspector was qualified.
Two routes: the carrier or its agent
Section 396.17(d) says a motor carrier may perform the required annual inspection on vehicles under its control. Section 396.17(e) says that, instead, the carrier may have "a commercial garage, fleet leasing company, truck stop, or other similar commercial business" perform the inspection as its agent, provided that the business operates and maintains facilities appropriate for commercial vehicle inspections and employs qualified inspectors as required by 396.19.
So an independent diesel shop or a mobile repair business can perform annual inspections for its fleet customers. Two conditions apply to the business (suitable facilities, qualified people) and one set of conditions applies to each person who inspects.
A third route exists: under 396.17(f), a vehicle that passes a state or equivalent Canadian or Mexican periodic inspection program that meets the minimum standards in Appendix A is treated as having met the annual inspection requirement for 12 months, starting from the last day of the month of inspection.
What makes an inspector "qualified" under 396.19
The carrier must make sure each person performing annual inspections:
- Understands the inspection criteria in Part 393 and Appendix A to Part 396, and can identify defective components;
- Is knowledgeable of and has mastered the methods, procedures, tools and equipment used to perform an inspection; and
- Is capable by reason of experience, training, or both, in one of two ways:
- successfully completed a federal or state sponsored training program, or holds a certificate from a state or Canadian province that qualifies the person to perform commercial motor vehicle safety inspections; or
- has a combination of training or experience totaling at least one year. That can include a manufacturer sponsored or similar commercial training program in commercial vehicle operation and maintenance; experience as a mechanic or inspector in a motor carrier or intermodal equipment maintenance program; experience as a mechanic or inspector at a commercial garage, fleet leasing company or similar facility; or experience as a commercial vehicle inspector for a state, provincial or federal government.
In plain terms, a technician with at least a year of documented heavy-duty experience at your shop can qualify, provided that the person also knows Appendix A and Part 393 and can show it.
Brake work has its own rule
The annual inspection includes brakes, and brake adjustment and repair are frequent results of it. Section 396.25 separately requires that anyone responsible for inspecting, maintaining, servicing or repairing commercial vehicle brakes be qualified: through an approved apprenticeship or training program, a state or provincial certificate (including passing the CDL air brake tests, for a brake inspection), or at least one year of brake-related training or experience. Do not assume that a general inspector qualification covers every brake task.
The paperwork that proves qualification
Under 396.19(b), the carrier must retain evidence of each inspector's qualifications for the whole period the person performs annual inspections for that carrier, and for one year after. Records are not required for inspections done under a qualifying state periodic inspection program.
Because the legal duty is the carrier's, a fleet that uses your shop will ask you for this evidence. Make it easy. For each technician who inspects, keep a one-page qualification record with:
- name and role;
- start date and prior employers in heavy-duty maintenance, with dates;
- training completed (OEM courses, vocational programs, state certificates), with copies of certificates;
- a statement of familiarity with Part 393 and Appendix A, signed and dated;
- for brake work, the basis for 396.25 qualification.
Send a copy to each fleet that relies on your inspections, and update it when the technician completes new training.
What the inspector must produce
Section 396.21 requires the inspector to prepare a report that identifies the inspector, the motor carrier, the date, the vehicle, and the components inspected with the results, including any component that does not meet Appendix A, and that certifies the inspection is accurate and complete. The original or a copy is kept for fourteen months from the date of the report.
Section 396.17(c) adds that documentation must be on the vehicle: the report itself, or a sticker or decal showing the date, the name and address of the entity where the report is kept, information identifying the vehicle if it is not clearly marked, and a certification that it passed under 396.17.
What an annual inspection must cover
Appendix A to Part 396 lists the minimum periodic inspection standards. A vehicle does not pass if it has any listed defect in these areas:
- Brake system (service brakes, parking brake, drums or rotors, hoses, tubing, low pressure warning device, tractor protection valve, air compressor, electric brakes, hydraulic brakes, vacuum systems)
- Coupling devices (fifth wheels, pintle hooks, drawbars and towbars, safety devices)
- Exhaust system
- Fuel system
- Lighting devices
- Safe loading
- Steering mechanism
- Suspension
- Frame
- Tires
- Wheels and rims
- Windshield glazing
- Windshield wipers
- Motorcoach seats
- Rear impact guard
Each unit in a combination is a separate vehicle. A tractor, semitrailer, full trailer and converter dolly each need their own passing inspection. See our DOT annual inspection checklist and the step by step how to do a DOT annual inspection.
Questions shops ask
Does the inspector need an ASE certification? The federal rule does not name ASE. An ASE credential can be part of the evidence of training, but the test is the 396.19 criteria above.
Can a new technician inspect under supervision? The rule is written about the individual performing the inspection. If a technician does not yet meet 396.19, the qualified inspector should perform and sign the inspection, and the shop should not present the trainee as the inspector.
Can a mobile mechanic perform annual inspections in the customer's yard? Section 396.17(e) asks that the business operate and maintain facilities appropriate for commercial vehicle inspections. Mobile operators should think through how they will inspect brakes, suspension and frame safely, for example on level ground with proper wheel chocks and lifting equipment, and be ready to explain their setup to the fleet.
Do states add their own rules? Some states run periodic inspection programs, and intrastate carriers can be subject to state versions of these rules. Check the rules of the states where you work.
Turning annual inspections into steady work
Annual inspections come due every 12 months for every unit in a fleet. A shop that tracks the due dates and contacts the fleet ahead of time fills its schedule with predictable work and often finds the repairs that follow. MetaFleet lets shops run digital inspections from their own PDF form, keep the report with the unit and set PM and inspection reminders, and fleet customers can request an inspection through the customer portal. See inspections and DVIRs or get a walkthrough.
This guide summarizes 49 CFR 396.17, 396.19, 396.21 and 396.25 as shown on eCFR on October 30, 2026. It is not legal advice; read the current text before relying on it.