The 30-Day Rule: Maintenance Records You Must Keep
49 CFR 396.3 attaches to any vehicle you control for 30 consecutive days, so it covers the owner-operator too. What the file must contain, where it has to be kept, and why selling the truck does not close it.
Most owner-operators read 49 CFR 396.3 and assume it is a fleet rule. It is not. The regulation attaches to any motor vehicle a carrier controls for 30 consecutive days — and if you run under your own authority, that is your truck.
The section was amended on July 21, 2026 (91 FR 45662), but that was a general technical-corrections rule across the FMCSRs. The recordkeeping duty itself did not change. What follows is what the rule has required all along, and what roadside and audits actually ask to see.
What the rule says
Paragraph (a) is the broad duty: every motor carrier must systematically inspect, repair and maintain the vehicles under its control, and parts and accessories must be in safe and proper operating condition at all times — not only on inspection day.
Paragraph (b) is the paperwork, and it is specific. For each vehicle you control for 30 consecutive days, the file must contain three things:
- Vehicle identification — company number if the truck is so marked, make, serial number and year. If the vehicle is not yours, the record must also name the person furnishing it.
- A means to indicate the nature and due date of each inspection and maintenance operation to be performed. In plain terms: a schedule that shows what is due and when, not just what was done.
- A record of inspections, repairs and maintenance showing the date and the nature of each one.
That middle item is the one most files are missing. A stack of paid invoices proves what you fixed. It does not, by itself, show what is coming due.
Where the records live, and for how long
Paragraph (c) is the part that catches people. The records must be retained where the vehicle is housed or maintained, for one year — and for six months after the vehicle leaves your control.
Two consequences follow directly from that sentence. First, a file that lives only at your accountant's office or in a cloud folder nobody can produce at the yard is not where the rule says it should be. Second, selling the truck does not close the file. You keep it another six months.
What this means for an owner-operator
The 30-day trigger is what converts this from a fleet chore into your obligation. Lease a truck for a month, run a rental unit through a season, or simply own the one you drive — the file requirement is the same. The rule counts the vehicle you control, not the size of your operation.
It also covers what you bolt onto the truck. If you run an auxiliary power unit, its service history belongs in the same file as the engine and the brakes: it is a component you inspect, repair and maintain like any other.
Practical checklist
- Open one file per unit — tractor and trailer separately.
- Write the identification block once: company number, make, serial number, year. Add the provider's name for anything you do not own.
- Build a due-date sheet, not just a receipt pile. One line per recurring item, with its interval and next due date.
- File every repair with its date and its nature. "Shop visit" is not a nature; "replaced left steer tire, rotated drives" is.
- Keep the file where the truck is housed or maintained, and keep it reachable there.
- When you sell or return a unit, mark the file and hold it six more months.
Before it costs you
The maintenance file is the cheapest compliance you own: it is built from work you are already paying for. The failure is almost never the maintenance — it is that nobody wrote down the due dates, or the folder was two hundred miles from the truck when someone asked for it.
If you want the shop side handled and documented as you go, The Truck Savers works on tractors and trailers in Houston, Dallas and Monterrey, and Go Green APU covers auxiliary power unit service that belongs in the same file.
Original source: eCFR — 49 CFR 396.3, Inspection, repair, and maintenance