Annual DOT Vehicle Inspection Requirements Under 49 CFR Part 396

By CarrierLens Compliance Team • Last updated: 2026-05-01

Under 49 CFR §396.17, every commercial motor vehicle operating in interstate commerce must undergo a periodic (annual) inspection at least once every 12 months. This inspection must meet the standards set out in Appendix G to 49 CFR Part 396 — commonly called the North American Standard Periodic Inspection. Operating a vehicle without a current annual inspection is an out-of-service (OOS) condition at roadside, and an acute violation in a compliance review.

Who Must Have Annual Inspections?

The annual inspection requirement applies to all commercial motor vehicles (CMVs) in interstate commerce, including:

• Power units (tractors, straight trucks) with a GVWR over 10,001 lbs
• Trailers and semi-trailers
• Converter dollies and pole trailers
• Passenger-carrying CMVs (buses, vans)

Each vehicle unit must have its own annual inspection. A tractor and its semi-trailer each need separate annual inspections even if they always operate together. The inspection must be completed within the prior 12 months — not just once every calendar year. If a vehicle was inspected in January of year 1, it must be re-inspected by January of year 2 regardless of how many months have passed since the start of the year.

Who Can Perform an Annual DOT Inspection?

Under §396.19, inspectors must have knowledge and experience with:

• The methods, procedures, tools, and equipment used in commercial vehicle inspection
• The ability to identify defective components using the criteria in Appendix G

Many states layer additional requirements on top of the federal baseline — including written certification exams, inspector licensing, and facility requirements. Carriers should verify the requirements for each state in which their vehicles are inspected. Eligible inspectors include: carrier mechanics who meet the qualifications, truck dealership service departments, commercial truck inspection shops, and third-party inspection services. FMCSA does not maintain a national registry of approved annual inspectors (unlike the NRCME for DOT physicals).

What Gets Inspected (Appendix G Standards)

Appendix G to 49 CFR Part 396 defines the inspection criteria across these major systems:

Annual Inspection Report Requirements

Under §396.21, every annual inspection must produce a written report that includes:

• The date of the inspection
• The identity of the vehicle inspected (VIN, unit number, or license plate)
• The name and address of the motor carrier operating the vehicle
• The signature of the inspector certifying the inspection was performed according to Appendix G standards
• A statement that the vehicle passed or a list of defects found (and whether they were corrected)

The carrier must retain the annual inspection report for 14 months from the date of inspection. It must be kept at the principal place of business or at the vehicle's domicile location, and a copy must be available to produce on request during roadside inspections and compliance reviews.

Common Violations Found in Annual Inspections

• Brake adjustment out of limits (most common OOS condition across all inspection types)
• Brake hoses and tubing — cracked, chafed, or improperly secured
• Tires below minimum tread depth or with sidewall bulges
• Inoperative lights (stop lamps, clearance lamps)
• Defective or missing emergency equipment
• Suspension component wear (U-bolt cracks, spring hangers)