How to Avoid Out-of-Service Violations

An out-of-service (OOS) order is among the most disruptive events in a carrier's operation. The driver cannot move the vehicle. The load is delayed, sometimes missing a time-sensitive delivery window. Repair arrangements must be made remotely. And the violation goes on the carrier's CSA record (USA) or CVOR record (Ontario), increasing inspection frequency and potentially triggering a compliance review. The best OOS violation is the one you prevented with a thorough pre-trip inspection and a consistent maintenance program.

What an OOS Order Means

An out-of-service order is issued by a certified commercial vehicle enforcement officer when an inspection finds a condition serious enough that the vehicle or driver must not continue operating until it is corrected. OOS criteria are standardized across North America through the Commercial Vehicle Safety Alliance (CVSA) Out-of-Service Criteria document, which is updated annually. This means that whether you are inspected in Texas, Ontario, or British Columbia, the same defects trigger the same OOS determination.

An OOS order for a vehicle defect means the vehicle cannot move under its own power until the defect is repaired and cleared by an officer. An OOS order for a driver (typically for hours-of-service violations) means the driver cannot operate until they have accumulated the required off-duty time. The vehicle can be moved by another driver or towed to a repair facility; the original driver cannot drive it.

Violating an OOS order — moving the vehicle or driving when ordered out of service — is a separate, serious criminal violation in most jurisdictions and results in significantly higher penalties than the original defect.

CVSA Inspection Levels

CVSA defines six levels of inspection, with Level I being the most comprehensive:

• Level I (North American Standard Inspection): Full inspection of driver's documentation (license, medical certificate, hours-of-service records) and vehicle (brakes, tires, lights, coupling, fuel system, cargo securement). This is the most common type at dedicated inspection facilities.
• Level II (Walk-Around Driver/Vehicle Inspection): Similar to Level I but the officer does not go under the vehicle. Common at roadside checks.
• Level III (Driver-Only Inspection): Focuses on driver documentation, credentials, and HOS records. No vehicle inspection.
• Level IV (Special Inspections): Targeted at specific items such as enhanced hazmat compliance or specific equipment types.
• Level V (Vehicle-Only Inspection): Vehicle inspected without the driver present, typically at a terminal or inspection facility.
• Level VI (Enhanced NAS Inspection for Radioactive Shipments): Specialized inspection for radioactive materials transport.

Level I inspections produce OOS orders at the highest rate. Understanding what Level I covers is the most direct guide to what you need to have right before an inspection.

Top OOS Violations: Brakes

Brake defects are consistently the leading cause of vehicle OOS orders, and they are among the most serious from a safety perspective. CVSA OOS criteria for brakes include: brakes that are out of adjustment beyond allowable stroke limits, brakes with missing or broken components, brake hoses or lines that are cracked, chafed, or leaking, and brakes that are inoperative (not contributing to stopping when applied).

Brake adjustment is the most common brake OOS violation and the most preventable. Air brake adjustment degrades with use — specifically with brake applications, even normal ones. Automatic slack adjusters are designed to maintain proper adjustment, but they fail and can mask adjustment problems. Manually checking brake adjustment with a ruler on each chamber during every major service interval (and whenever brake work is performed) is the professional standard.

Carriers who perform or commission brake work should use a brake inspection checklist that covers: push rod stroke measurement at all wheel positions, brake pad or shoe thickness at all positions, rotors or drums for cracks or scoring, and hose and line condition. Document the inspection. This documentation is the evidence that you maintained your brakes when a compliance auditor reviews your maintenance records.

Top OOS Violations: Tires

Tires are the second-largest category of vehicle OOS violations. The most common tire OOS conditions include: tread depth below minimums (4/32 inch on steer axles, 2/32 inch on other axles in the USA; similar in Canada), exposed cord or fabric in the tread area or sidewall, flat or significantly under-inflated tires (including inner duals on tandem axle configurations), tires that are separated from the tread or have visible bulges, and tire contact with other tires or vehicle components (rubbing).

Steer axle tires receive the strictest standards because they directly control vehicle steering. A steer tire failure at highway speed is among the most dangerous mechanical events in trucking. Inspect steer tires at every pre-trip and replace them well before they reach the minimum tread depth — a tire at 5/32 inch on the steer axle is getting close; at 4/32 inch it passes the minimum but has no margin. Replace it.

Inner duals on tandem drive and trailer axles are a persistent problem because they are less visible and less frequently checked. Use a tread depth gauge or a hammer handle to thump both tires in every dual pair. A flat inner dual sounds distinctly different from an inflated one.

Top OOS Violations: Hours of Service

Driver HOS violations are the leading cause of driver OOS orders at Level I and Level III inspections. Officers check ELD records or paper logs for: exceeding driving time limits, violating the on-duty window limits, failure to take required rest breaks (USA: 30-minute rest requirement after 8 hours of driving for most drivers), cycle violations, and ELD malfunction or non-compliance (not carrying required paper logs during an ELD malfunction, for example).

The most straightforward way to avoid HOS OOS violations is to run legal hours every day with no exceptions. Drivers who occasionally manipulate logs, misuse the 8-minute buffer, or incorrectly use personal conveyance to extend driving time are taking a significant risk. ELD data is audited carefully by experienced officers — patterns of suspicious log entries are detectable.

Top OOS Violations: Lights and Lighting Equipment

Non-functional lights are a common OOS trigger at nighttime or inclement weather inspections. Required lights that are inoperative — headlights, taillights, brake lights, turn signals, and required clearance and marker lights — are OOS conditions. Missing reflectors on the rear of the trailer that are required by FMCSA or provincial standards are also OOS items.

Carry spare bulbs and fuses. A burned-out marker light is a $0.50 problem before the inspection and a multi-hour delay plus an OOS violation after. Check all lights at the pre-trip, paying particular attention to trailer lighting, which fails more frequently than tractor lighting because of connector wear and trailer age.

Top OOS Violations: Load Securement

Load securement OOS violations are common for flatbed operators and carriers of irregular freight. CVSA OOS criteria for cargo include: cargo that is not properly restrained and could shift or fall (immediate OOS), insufficient tie-down devices for the cargo weight and type, use of damaged securement devices (cut webbing, bent hooks, cracked chains), and aggregate working load limit that is less than half the cargo weight.

Under 49 CFR Part 393 (USA), the minimum securement requirement is tie-down aggregate working load limit of at least half the cargo weight, with a minimum number of tie-downs based on cargo length and weight. Canada uses NSC Standard 10, which is similar in structure. Know the specific requirements for the types of cargo you regularly carry — lumber, coils, pipes, machinery, and vehicles all have specific securement rules that go beyond the general minimum.

International Roadcheck

CVSA conducts International Roadcheck each year — a 72-hour enforcement blitz during which thousands of officers across the USA, Canada, and Mexico conduct Level I through III inspections simultaneously. CVSA publishes the date in advance and announces a specific focus area each year (brakes, tires, cargo securement, or driver credentials have all been recent focus areas). In 2026, International Roadcheck will be conducted June 17–19.

The best preparation for Roadcheck is the same as preparation for any inspection: maintain the vehicle, run legal hours, carry all required documents. Carriers who try to specifically prepare only for Roadcheck and operate differently the rest of the year are treating a symptom, not the underlying compliance culture problem.

Preparing Before It Costs You

An OOS violation on your CSA record stays in the calculation for 24 months. During that period, it elevates your percentile in the Vehicle Maintenance BASIC or Driver Fitness BASIC, increasing your likelihood of being selected for future inspections. A carrier with a pattern of OOS violations will face inspection at practically every weigh station and roadside check point they pass. A carrier with clean inspection history benefits from PrePass bypass privileges in the USA and comparable programs in Canada, spending less time at scales and more time delivering.

The investment in proactive maintenance — scheduled brake adjustments, tire replacement before minimums, lighting checks — costs far less than the combined cost of OOS delays, repair bills at roadside rates, and the inspection frequency increase that follows a poor safety record.

Keep your truck clean and your operation rolling. Get dispatched with TRUCC — carrier-side dispatch across Canada and the USA.