• Under 49 CFR §396.3, carriers generally need vehicle-specific maintenance records for motor vehicles under their control for 30 consecutive days or more, including certain leased and owner-operator equipment.
• Records should identify each vehicle, document the maintenance operations required and when they are due, and maintain a history showing the date and nature of inspections, repairs, and maintenance performed.
• Required §396.3 records are generally retained for one year while the vehicle remains under the carrier’s control and six months after it leaves; annual periodic inspection documentation follows separate requirements under §396.17.

What Are FMCSA Vehicle Maintenance Records?

FMCSA vehicle maintenance records document how a motor carrier systematically inspects, repairs and maintains the commercial motor vehicles under its control.

These records are part of the broader requirements contained in 49 CFR Part 396 — Inspection, Repair, and Maintenance.

The fundamental rule is straightforward: a motor carrier must systematically inspect, repair, and maintain the vehicles under its control so parts and accessories remain in safe and proper operating condition.

But during an FMCSA investigation, saying that your company maintains its trucks isn’t enough.

Your records need to demonstrate it.

That’s why §396.3 establishes specific recordkeeping requirements for vehicles a motor carrier controls for an extended period.

Which Vehicles Require FMCSA Maintenance Records?

Under 49 CFR §396.3(b), carriers generally must maintain the required vehicle maintenance records for each motor vehicle they control for 30 consecutive days.

This means the requirement is not limited to vehicles the company owns.

It can also apply to vehicles that are:

• Leased
• Rented
• Furnished by an owner-operator
• Otherwise placed under the carrier’s control

The important issue is control, not simply whose name appears on the title.

A short-term rental used for fewer than 30 consecutive days may therefore be treated differently from equipment continuously operated under your authority for months.

For carriers using owner-operators or leased equipment, this distinction matters most.

What Information Must Identify Each Vehicle?

Each vehicle record must contain enough information to clearly identify the unit.

Under §396.3, this includes:

• Company number, if the vehicle is marked with one
• Make
• Serial number
• Year

If the carrier does not own the vehicle, the record must also identify the person furnishing the vehicle.

Operationally, many carriers go further and maintain information such as:

• VIN
• License plate
• Tractor or trailer number
• Equipment type
• Lease start date
• Lease termination date
• Current status
• Assigned terminal or location

Not every additional field is explicitly required by §396.3, but they can make the file substantially easier to manage.

An auditor should not have to guess whether “Unit 418” in a repair invoice is the same vehicle identified by another system under its VIN.

How Should Carriers Document Scheduled Maintenance?

One of the most important, and often misunderstood, requirements of §396.3 is that the vehicle file must contain a method for showing:

The nature of the inspection and maintenance operations to be performed and when those operations are due.

In other words, a pile of repair receipts isn’t necessarily a preventive maintenance program.

Your records should demonstrate that the fleet has a system for determining:

• What must be inspected
• What must be serviced
• When it should happen
• Whether it actually happened

What Can a Preventive Maintenance Schedule Look Like?

FMCSA does not require one universal maintenance interval for every fleet.

The appropriate schedule can depend on factors including:

• Vehicle manufacturer recommendations
• Mileage
• Engine hours
• Vehicle age
• Type of equipment
• Operating environment
• Duty cycle
• Historical maintenance patterns

A carrier might therefore schedule maintenance according to

• Mileage. For example: PM service every 15,000 miles.
• Time. For example: Certain inspections every 90 days.
• Engine Hours. This can be particularly useful for equipment that spends significant time idling or operating without accumulating high road mileage.
• Combination of Factors. A fleet may service a vehicle every 15,000 miles or 90 days, whichever comes first.

Whatever system your company uses, it should be consistent and documented.

What Should the Inspection, Repair and Maintenance History Contain?

Section 396.3 requires a record of inspections, repairs and maintenance showing their:

• Date
• Nature

A useful maintenance history therefore tells the story of what happened to the vehicle.

For example:

March 18, 2026 — 284,215 miles

PM service completed. Engine oil and filters replaced. Brake system inspected. Left front brake chamber replaced. Tires inspected and inflation corrected.

That’s substantially more useful than:

3/18 — Maintenance completed.

The objective is to create a record that another person can understand months later without relying on the memory of the mechanic who performed the work.

Maintenance History May Include

Depending on the fleet, records can include:

• Preventive maintenance services
• Brake inspections
• Brake repairs
• Tire replacements
• Lighting repairs
• Steering repairs
• Suspension work
• Engine repairs
• Transmission repairs
• Wheel and rim work
• Safety-related component replacements
• Roadside repair work
• Inspection-generated repairs
• Driver-reported defect repairs

Supporting documents can also include:

• Work orders
• Repair invoices
• Shop records
• Parts invoices
• Electronic maintenance-system records
• Mechanic notes
• Inspection reports

The important factor is that the carrier can connect the documentation to the correct vehicle and demonstrate the date and nature of the work.

Who Is Responsible for Maintenance Records on Leased Vehicles?

This is an important issue for carriers working with leased trucks or owner-operators.

FMCSA guidance makes clear that the motor carrier remains responsible for vehicles subject to its control for 30 consecutive days or more.

The carrier may perform the inspections and maintenance itself or cause another party to perform them, but outsourcing the work does not outsource the regulatory responsibility.

If a leasing company, owner-operator or outside maintenance shop performs the maintenance, the carrier still needs to ensure that the vehicle is maintained properly and that suitable records exist.

For FMCSA purposes, the carrier is responsible for ensuring vehicles under its control remain in safe operating condition and that defects are corrected.

Example: Owner-Operator Equipment

Suppose an owner-operator leases a tractor onto your authority for nine months.

The owner-operator handles maintenance and pays the repair bills.

That does not mean the carrier can simply say:

“The owner-operator has those records.”

The carrier needs a process ensuring that required maintenance is performed and that suitable records are available.

This distinction becomes especially important during an audit.

How Long Must FMCSA Vehicle Maintenance Records Be Kept?

Under §396.3(c), the required maintenance records generally must be retained:

• For one year while the vehicle remains under the motor carrier’s control and;
• For six months after the vehicle leaves the motor carrier’s control.

That second requirement is easy to overlook.

Selling a truck, returning a leased vehicle, or terminating an owner-operator lease does not mean the associated maintenance file should immediately be deleted.

The carrier should document the date the vehicle left its control and retain the required records for another six months.

Example

Suppose a tractor leaves your fleet on:

June 15, 2026

The applicable §396.3 maintenance records should generally remain available through at least:

December 15, 2026

This is one reason vehicle disposition dates should be recorded in your maintenance system.

Without them, determining when a file can legally be removed becomes unnecessarily difficult.

Where Should Vehicle Maintenance Records Be Stored?

The regulation states that the required records are retained where the vehicle is housed or maintained.

FMCSA guidance provides additional flexibility when a vehicle isn’t housed or maintained at a single location.

Carriers may maintain records at another location of their choice, but the records still need to be:

• Current
• Accurate
• Accessible

FMCSA guidance states that when requested, maintenance records must be made available within a reasonable period, identified by the agency as two working days.

For modern carriers, that makes digital vehicle files particularly useful.

The question shouldn’t be: “Do we have that invoice somewhere?”

It should be: “Can we retrieve the complete maintenance history for Unit 521 right now?”

Preventive Maintenance Records vs. Annual Inspection Records

One of the most common compliance mistakes is treating a passed annual inspection as evidence of a complete preventive maintenance program. They’re not the same thing.

Preventive Maintenance Records — §396.3

The §396.3 records demonstrate the carrier’s ongoing systematic maintenance program.

They show:

• What maintenance is scheduled
• When it is due
• What inspections occurred
• What repairs were performed
• When the work occurred
• What type of work was completed

This is an ongoing history.

Annual Periodic Inspection — §396.17

The annual inspection is a separate requirement.

Under §396.17, every applicable commercial motor vehicle must pass a periodic inspection at least once during the preceding 12 months.

The inspection must cover, at minimum, the components specified in the applicable FMCSA periodic inspection standards.

Documentation of that inspection must be on the vehicle and that documentation may consist of:

• The inspection report; or

• A qualifying sticker or decal based on the report.

Table of Comparison

The easiest way to remember the difference is:

• The annual inspection is a snapshot.
• The maintenance file is the movie.

Passing one inspection once a year does not demonstrate that the carrier systematically maintained the vehicle during the other 364 days.

What Must the Annual Inspection Documentation Show?

Under §396.17, documentation based on the periodic inspection report must include information such as:

• Date of inspection
• Name and address of the carrier or other entity where the inspection report is maintained
• Information uniquely identifying the vehicle, when necessary
• Certification that the vehicle passed the inspection required by §396.17

There is no single mandatory FMCSA form that every carrier must use.

The important issue is whether the documentation contains the required information and reflects a properly completed inspection.

The carrier must also ensure the inspection was performed by an appropriately qualified inspector where federal inspector-qualification requirements apply.

How Long Must Annual Inspection Reports Be Retained?

This is another reason not to mix §396.3 and §396.17 documentation.

FMCSA guidance states that the periodic inspection report should generally be retained for 14 months from the date of the inspection.

The vehicle must also have documentation showing that the required inspection occurred within the preceding 12 months.

That documentation may be the report itself or qualifying inspection documentation such as a sticker or decal.

• Different document.
• Different purpose.
• Different retention rule.

What Does an Audit-Ready Vehicle Maintenance File Look Like?

A compliant file shouldn’t merely contain documents. It should make the compliance history easy to reconstruct. A practical audit-ready vehicle file might be organized into the following sections.

1. Vehicle Identification

Keep a master record containing:

• Unit number
• VIN
• Make
• Model
• Year
• License plate
• Equipment type
• Ownership status
• Owner or lessor when applicable
• Date placed under carrier control
• Date removed from carrier control

2. Preventive Maintenance Schedule

Document:

• Required maintenance operations
• Service intervals
• Mileage thresholds
• Time thresholds
• Next due date
• Next due mileage
• Responsible department or vendor

The system should make overdue maintenance easy to identify.

3. Preventive Maintenance History

Maintain chronological records showing:

• Date
• Mileage
• Type of inspection
• Maintenance performed
• Repairs completed
• Shop or mechanic
• Work-order reference

4. Repair Documentation

Include documentation for significant repairs, especially safety-related repairs involving:

• Brakes
• Tires
• Steering
• Suspension
• Lights
• Wheels
• Coupling devices
• Other safety-critical components

5. Defect and Correction Records

When defects are identified during:

• Driver inspections
• Roadside inspections
• Preventive maintenance inspections
• Annual inspections

the file should make it possible to demonstrate what corrective action occurred.

A good compliance trail looks like:

Defect identified → repair ordered → repair completed → vehicle returned to service.

6. Annual Inspection Documentation

Maintain the current annual periodic inspection documentation separately and make sure the required current documentation is available on the vehicle.

Track:

• Inspection date
• Inspection expiration/due date
• Inspector
• Inspection facility
• Report
• Proof of compliance
• Repairs resulting from the inspection

7. Roadside Inspection Records

Roadside inspection findings can identify recurring maintenance issues before they become larger CSA problems.

Keep:

• Inspection report
• Violations
• Out-of-service conditions
• Repair documentation
• Proof of correction
• DataQs documentation when applicable

8. Vehicle Disposition Documentation

When the vehicle leaves the carrier’s control, record:

• Date removed from service
• Date sold, returned, or lease terminated
• Buyer/lessor information when relevant
• Required record-destruction date

This makes the six-month post-control retention rule manageable.

FMCSA Vehicle Maintenance File Checklist

For each vehicle controlled for 30 consecutive days or more, verify that you can quickly produce:

Vehicle Identification

• Unit number
• Make
• Serial number/VIN
• Year
• Owner/lessor if not carrier-owned

Maintenance Schedule

• Type of preventive maintenance required
• Maintenance intervals
• Due dates
• Due mileage where applicable

Maintenance History

• Inspection dates
• Maintenance dates
• Repairs performed
• Nature of each service
• Supporting work orders or invoices

Annual Inspection

• Current periodic inspection
• Inspection date
• Required identification information
• Certification the vehicle passed
• Current documentation available on the vehicle

Defects and Repairs

• Driver-reported defects
• Inspection findings
• Safety-related repairs
• Documentation proving correction

Retention

• At least one year of required records while under control
• Six months after leaving carrier control
• Annual inspection report retained according to its separate requirement

If your compliance staff can’t produce these records without searching several systems, email accounts and filing cabinets, the problem isn’t necessarily missing maintenance.

The problem is proving the maintenance happened.

What FMCSA Looks for During a Vehicle Maintenance Audit

During a compliance review, investigators may request files for selected vehicles rather than reviewing every truck in the fleet. That makes consistency important.

You don’t know which vehicle will be selected.

A strong file should demonstrate three things.

1. There Is a System

The carrier has defined inspection and maintenance intervals.

2. The System Is Actually Followed

Maintenance records correspond to those scheduled intervals.

3. Defects Are Corrected

When drivers, mechanics or inspectors identify safety defects, the carrier can show what happened next.

A maintenance program that exists only in a written policy but isn’t reflected in vehicle records is difficult to defend.

The same is true of a folder full of repair invoices with no documented preventive maintenance schedule.

Compliance requires both the process and the evidence.

Common FMCSA Vehicle Maintenance Record Mistakes

Keeping Only Repair Invoices

Invoices document repairs.

They do not necessarily demonstrate a systematic preventive maintenance schedule.

Keeping Only Annual Inspections

An annual inspection does not replace the ongoing maintenance records required by §396.3.

Missing Maintenance Due Dates

The regulation requires a means of identifying the nature and due date of maintenance operations.

Ignoring Leased Equipment

Vehicles don’t disappear from your compliance responsibilities simply because someone else owns them.

If they’re under your control long enough to trigger the requirement, you need a system for their maintenance records.

Deleting Records When a Truck Leaves the Fleet

The required records must continue to be retained for six months after the vehicle leaves the carrier’s control.

Maintenance Records Scattered Across Multiple Vendors

Using outside shops isn’t the problem.

Failing to centralize their documentation is.

No Link Between Defects and Repairs

If an inspection identifies a brake defect, the file should show how and when it was corrected.

Vehicle Maintenance Records and CSA Performance

Maintenance documentation isn’t only an audit issue.

The underlying maintenance program directly influences roadside inspection performance and the Vehicle Maintenance BASIC.

Common roadside violations can involve:

• Brakes
• Tires
• Lighting
• Wheels
• Steering
• Suspension
• Emergency equipment
• Other vehicle components

A recurring pattern of those violations may indicate that preventive maintenance intervals, driver inspection procedures or repair controls aren’t working.

That makes maintenance records useful for more than satisfying FMCSA.

They can help identify where the fleet’s safety program is breaking down.

How Simplex Group Helps With FMCSA Vehicle Maintenance Compliance

Managing vehicle maintenance compliance gets more difficult as a fleet grows.

Ten trucks can produce hundreds of:

• PM services
• Repair invoices
• Annual inspections
• Driver defects
• Roadside inspections
• Maintenance deadlines

Over several years, the volume becomes significant.

Simplex Group helps carriers build more structured compliance processes around FMCSA vehicle maintenance requirements.

Build a More Organized Maintenance Record System

We can help carriers understand what §396.3 requires and organize vehicle documentation so each unit has a clear maintenance history.

Identify Missing or Incomplete Records

The worst time to discover that three months of maintenance records are missing is after FMCSA asks for them.

Reviewing your files proactively gives you an opportunity to identify weaknesses earlier.

Track Annual Inspection Compliance

Annual inspections need to be treated as their own compliance requirement.

A structured system helps prevent vehicles from operating after inspection documentation expires.

Review Roadside Inspection Patterns

Repeated maintenance violations can point to deeper problems with:

• PM intervals
• Driver inspections
• Maintenance vendors
• Repair verification
• Fleet oversight

Addressing the pattern is more useful than repeatedly fixing the same defect.

Prepare for DOT Audits

An audit-ready maintenance program means being able to produce requested vehicle files quickly and explain how the carrier’s maintenance system works.

Simplex Group helps carriers prepare their documentation before an investigator asks for it.

FAQs