Vehicle Maintenance Files: What FMCSA Requires for Trucks & Trailers

Published by the TruckDriversPRO team

Quick answer: Under 49 CFR Part 396, every commercial motor vehicle under a carrier’s control for 30 days or more needs its own maintenance file, and every vehicle needs a full inspection at least once every 12 months. In a tractor-semitrailer-full trailer combination, each segment, including the converter dolly, counts as its own vehicle and needs its own file. Carriers most often get cited not for skipping maintenance, but for failing to document upcoming due dates, even when the actual work was done on time.

If you’re managing training vehicles for a CDL school or trucks and trailers for a fleet, the maintenance side of compliance tends to get less attention than driver files. That’s a mistake. Vehicle maintenance records are their own audit category, with their own retention rules and their own common failure points.

TruckDriversPRO centralizes truck and trailer documentation alongside driver records, with expiration visibility and exportable, audit-ready reports.

What a Maintenance File Actually Needs

At minimum, a compliant file covers:

A record of inspections, repairs, and maintenance performed on the vehicle
Documentation of the annual inspection, which must happen at least once every 12 months for every commercial motor vehicle
Qualifications of the person who performed the inspection, kept on file at the location where they work
For combination vehicles, a separate record for each segment. A tractor pulling a semitrailer and a full trailer means three files, not one, including the converter dolly if there’s one in the mix

The part that trips up more carriers than anything else: tracking upcoming due dates. It’s not enough to show the last inspection happened on time. Reviewers specifically look for whether the file shows when the next one is due, and its absence is a citable finding on its own, separate from whether the maintenance itself was actually current.

The 30-Day Threshold

This requirement kicks in once a carrier has control of a vehicle for more than 30 consecutive days. If you’re leasing equipment short-term or rotating vehicles quickly, it’s worth tracking that 30-day mark specifically, since it determines whether the full maintenance file requirement applies to that particular vehicle yet.

Daily Inspections Are a Separate Requirement

Maintenance files and daily driver inspection reports (DVIRs) aren’t the same thing, and both are required. Drivers have to inspect the vehicle they’re operating and prepare a written report at the end of each day’s work, covering service brakes, trailer brake connections, and the other safety-critical systems. If a driver operates more than one vehicle in a day, that’s a separate report for each one. Any defect that affects safety has to be noted and corrected before the vehicle goes back into service.

What Happens When a Vehicle Fails

A vehicle or piece of equipment found with a safety-critical defect gets marked out-of-service, and it stays that way, including for towing purposes beyond specific exceptions, until the required repairs are completed and documented. Signing off on a vehicle with an uncorrected defect on record is its own separate violation, on top of whatever the original defect was.

Why This Matters More Than It Might Seem

Annual inspection violations are consistently one of the most common vehicle maintenance findings in FMCSA’s compliance system. It’s not usually because carriers are skipping inspections altogether. It’s a documentation gap: the inspection happened, but the file doesn’t clearly show it, or doesn’t show when the next one is due. Civil penalties for maintenance recordkeeping violations can run well into the thousands of dollars per violation, and that’s before accounting for the operational cost of a vehicle getting pulled out of service during a roadside inspection because its paperwork wasn’t in order.

Keeping This Organized in Practice

Track each vehicle segment separately, not just each combination as a whole. A tractor-trailer set isn’t one file, it’s several.
Build in advance warnings for the annual inspection deadline, not just a record of the last one completed. This is the single most commonly missed piece.
Keep inspector qualification records on file, not just the inspection results themselves.
Treat DVIRs and maintenance files as two separate systems that both need to stay current, since an auditor will ask about both.

Frequently Asked Questions

How often does a commercial vehicle need a full inspection? At least once every 12 months, under 49 CFR 396.17. This applies to every commercial motor vehicle under the carrier’s control, and each segment of a combination vehicle is inspected and documented separately.

Does a leased vehicle need its own maintenance file? Once a carrier has control of a vehicle for more than 30 consecutive days, it needs a maintenance file, regardless of whether the vehicle is owned or leased.

What’s the most common reason carriers get cited on vehicle maintenance? Missing documentation of upcoming inspection due dates. The underlying maintenance is often current, but the file doesn’t clearly show when the next inspection is required, which is a citable gap on its own.

Are daily driver vehicle inspections the same as the annual inspection? No. Daily inspection reports (DVIRs) are a separate, ongoing requirement completed by the driver at the end of each day’s work. The annual inspection is a more thorough, periodic inspection required at least once every 12 months. Both are required, and they don’t substitute for each other.

Vehicle Maintenance Files: What FMCSA Requires for Every Truck and Trailer