FMCSA Commercial Motor Vehicle Inspection, Repair, and Maintenance

Every commercial truck, bus, and trailer operating in interstate commerce must meet ongoing maintenance standards — not just when it leaves the factory or the dealer, but continuously throughout its service life. 49 CFR Part 396 — Inspection, Repair, and Maintenance — is the Federal Motor Carrier Safety Administration's rule establishing the minimum maintenance obligations for commercial motor vehicle (CMV) fleets: pre-trip driver inspections, annual periodic inspections, brake inspector qualifications, and recordkeeping that allows regulators and enforcement officers to verify compliance. Part 396 works alongside the Driver-Vehicle Inspection Report (DVIR) system and roadside inspection programs to form the core of FMCSA's vehicle safety framework — the rules that determine whether a commercial truck can legally operate on U.S. highways.

Legal Authority

• 49 U.S.C. § 504 — FMCSA authority to prescribe standards for CMV safety: authorizes FMCSA to require motor carriers, drivers, and equipment providers to inspect, repair, and maintain commercial motor vehicles in safe condition; the foundational authority for 49 CFR Part 396
• 49 CFR Part 396 — Inspection, Repair, and Maintenance: requires motor carriers to systematically inspect every CMV they operate; mandates pre-trip driver vehicle inspections and written reports (DVIRs), annual periodic vehicle inspections by qualified inspectors, and maintenance records demonstrating ongoing compliance

Key Mechanics

Part 396 operates on a layered time schedule. Every commercial driver must perform a pre-trip inspection before each duty period and submit a Driver Vehicle Inspection Report (DVIR) in writing at the end of each day's driving — identifying any defects or deficiencies observed. If defects are reported, the carrier must repair them before the vehicle returns to service; the next driver's DVIR must acknowledge the repair. Every CMV must receive a complete annual periodic inspection — 50+ item checklist covering brakes, lights, tires, steering, suspension, and coupling systems — conducted by a qualified brake inspector or an FMCSA-approved inspection program. Annual inspection decals or certificates must be on the vehicle and producible at roadside checkpoints. Carriers must retain all inspection, repair, and maintenance records for the period FMCSA specifies (typically 1 year for DVIRs, 1 year after the vehicle leaves the carrier's control for other records). FMCSA roadside inspectors (working with state law enforcement under the Commercial Vehicle Safety Alliance — CVSA) check vehicle conditions and pull out-of-service any CMV or driver failing safety standards.

Current Rule (2026)

What This Rule Does

Part 396 establishes a layered maintenance system operating at multiple time scales:

1. Pre-trip and post-trip inspection (every operating day) — drivers must inspect their vehicles before operating them, and must prepare a written report at the end of each day's duty identifying any defects
2. Annual (periodic) inspection — every CMV must receive a comprehensive inspection at least once per year covering all safety-critical systems
3. Maintenance and repair — motor carriers must systematically maintain their vehicles and ensure identified defects are repaired before the vehicle is returned to service

The compliance ecosystem extends to the roadside inspection programs conducted by state enforcement officers under the Commercial Vehicle Safety Alliance (CVSA) — the inspection reports generated in the field directly reference Part 396 requirements and can place a vehicle out of service immediately if critical violations are found.

Key Provisions

• § 396.1 — Scope: every motor carrier, and its officers, drivers, agents, and employees directly concerned with inspection or maintenance of CMVs must be knowledgeable of and comply with Part 396; both the carrier and the individual driver bear legal responsibility for vehicle roadworthiness

• § 396.11 — Driver Vehicle Inspection Report (DVIR): every motor carrier must require its drivers to report in writing any defect or deficiency discovered before, during, or after the day's operation; the DVIR must cover at minimum the parts and accessories listed in Appendix A to Part 396 (brakes, steering, lighting, tires, windshield, mirrors, coupling devices); the driver must certify whether or not defects affecting safety were found; the motor carrier must certify on the DVIR that defects were repaired or that repair is unnecessary before allowing the next driver to operate the vehicle; DVIRs must be retained for 3 months

• § 396.13 — Driver pre-trip inspection: before driving, every driver must:

  1. Be satisfied that the motor vehicle is in safe operating condition
  2. Review the last driver vehicle inspection report (DVIR) on file for the vehicle
  3. Sign the prior DVIR only if satisfied that any reported defects have been repaired or are not safety-affecting The pre-trip requirement places a legal duty on the driver — not just the carrier — to verify safety before operating. A driver who knowingly operates a vehicle with a known brake defect, for example, shares liability with the carrier.

• § 396.17 — Annual periodic inspection: every CMV must be inspected at least once every 12 months covering at minimum the parts and accessories specified in Appendix A to Part 396 (the comprehensive inspection criteria covering brakes, lighting, tires, wheels, steering, coupling devices, suspension, fuel systems, frames, and cab); the inspection must be performed by or under the direction of a qualified inspector (§ 396.19); the inspection must cover the entire vehicle — not just systems that appear defective; a trailer connected to a tractor has separate annual inspection requirements

• § 396.19 — Inspector qualifications: the periodic annual inspection must be performed by a qualified inspector who:

  1. Understands the inspection criteria in Appendix A to Part 396
  2. Can identify defective components
  3. Has the skills to use appropriate inspection tools (e.g., brake stroke measurement tools, tire pressure gauges, lighting circuit testers) Motor carriers must document that their designated inspectors meet these qualifications; the absence of documented inspector qualification is itself a violation that can result in all inspections performed by unqualified personnel being treated as invalid

• § 396.21 — Periodic inspection recordkeeping: the inspector must prepare a report containing:

  • Name and address of the motor carrier operating the vehicle
  • The date and location of the inspection
  • Vehicle identification (VIN, license plate, fleet number)
  • Identification of the inspector
  • Listing of each item inspected, whether it passed or failed, and any corrective action required
  • Certification that the inspection was performed in compliance with Part 396 Records must be retained by the motor carrier for 14 months from the date of inspection; a copy must be carried on or in the vehicle — inspectors conducting roadside inspections use the annual inspection certification to verify that the required annual inspection was conducted

• § 396.23 — Equivalent to periodic inspection: if a CMV undergoes a mandatory state inspection program that FMCSA has determined to be equivalent to the Part 396 annual inspection (currently, 17 states have FMCSA-approved equivalency determinations), that state inspection can substitute for the annual federal inspection requirement; carriers operating exclusively in states with approved programs may use the state inspection rather than conducting a separate federal annual inspection

• § 396.25 — Brake inspector qualifications: because brakes are the most safety-critical system on a CMV (brake failure causes a disproportionate share of truck crashes), Part 396 establishes separate, more stringent qualifications for individuals who inspect, adjust, maintain, or repair brakes:

  • The individual must meet one of three criteria: (1) completion of an apprenticeship or journeyman mechanic program covering brake service; (2) at least one year of brake service experience on CMVs; or (3) successful completion of a brake inspector training course meeting Part 396 standards
  • Brake inspector qualifications are not a certification but a qualification that the carrier must document; a carrier who assigns brake work to unqualified personnel faces both regulatory sanctions and enhanced liability in brake-related crash litigation
  • The Appendix to § 396.25 specifies the minimum training content for brake inspector courses, including both air brakes (the dominant CMV system) and hydraulic brakes (less common on heavy trucks)

• Appendix A to Part 396 — CVSA Periodic Inspection Standards: the comprehensive list of inspection items and pass/fail criteria that define what the annual periodic inspection must cover; structured around major systems: (1) brake systems — adjustment, condition of linings, drums, hoses, air pressure; (2) coupling devices — fifth wheel and kingpin engagement, pintle hook condition; (3) exhaust system — exhaust leaks near cab; (4) fuel system — tank mounting, cap, absence of leaks; (5) lighting — operational headlights, tail lights, brake lights, turn signals; (6) steering — play, condition; (7) suspension — spring condition, shock absorber mounting; (8) frame — cracks, bends, rust; (9) tires — tread depth, sidewall condition, inflation; (10) wheels and rims — cracks, broken studs; (11) windshield glazing — cracks in critical vision zones; (12) windshield wipers — functionality

How It Affects You

If you are a commercial driver (CDL holder): Part 396 duties are personal — not just your employer's. You are legally required to perform pre-trip inspections and must refuse to operate a vehicle with safety-affecting defects until they are repaired. If a law enforcement officer finds a brake violation or another critical defect during a roadside inspection, your vehicle may be placed out of service immediately, ending that day's load. Repeated out-of-service violations can affect your Commercial Driver's License (CDL) through FMCSA's Safety Measurement System (SMS), which tracks driver-level violation histories.

If you operate or manage a motor carrier fleet: the annual inspection requirement applies to every trailer in your fleet, not just tractors — a common compliance gap is trailers that are not inspected on the 12-month cycle because they move between locations and get overlooked. FMCSA's compliance review process examines annual inspection records in detail; missing inspections are a high-weight safety deficiency in carrier Safety Ratings. Brake violations are the most common out-of-service finding in roadside inspections; investing in qualified brake maintenance reduces both regulatory risk and crash liability.

If you are involved in litigation arising from a truck crash: Part 396 maintenance records — DVIRs, annual inspection reports, repair work orders — are among the first documents sought in discovery for truck crash cases. A vehicle placed out of service for brake violations in the period before a crash creates significant negligence evidence against the carrier. The absence of required records (DVIRs not retained for 3 months, annual inspection records not in the vehicle) itself constitutes a violation pattern. FMCSA safety data, including a carrier's SMS scores, is publicly available and frequently used in litigation.

Statutory Authority

This rule implements:

• 49 U.S.C. § 504 — FMCSA authority to prescribe minimum safety standards for commercial motor vehicles operating in interstate commerce, including inspection and maintenance requirements
• 49 U.S.C. § 31136 — Federal Motor Vehicle Safety Standards authority that includes authority over vehicle maintenance and inspection standards for commercial vehicles

Recent Rulemakings

FMCSA updated the annual inspection criteria in 2016 to align with CVSA North American Standard Out-of-Service Criteria, ensuring that roadside inspection results and annual inspection criteria use consistent pass/fail standards. The North American Standard Level I Inspection (conducted by CVSA-certified state inspectors) is the most comprehensive roadside inspection and covers the same systems as the Part 396 annual inspection — a Level I passing result can serve as an annual inspection equivalent in most cases. FMCSA has also updated requirements for intermodal equipment providers (IEP) — the companies that own trailers used in intermodal shipping — to ensure that trailers entering the motor carrier system from intermodal operations meet Part 396 standards before road use.

Pending Action