How to build a fleet preventive maintenance schedule (with a template)

The short version. A preventive maintenance (PM) schedule says, for every vehicle, what service is due next and when — by miles, date or engine hours — and the service record shows it was done. For commercial motor vehicles both are required: 49 CFR 396.3 asks carriers for “a means to indicate the nature and due date” of inspection and maintenance work, and a dated record of what was done. The intervals are yours to set, starting from the manufacturer’s schedule.

What the regulations require

Under 49 CFR 396.3, every motor carrier must systematically inspect, repair and maintain all vehicles under its control, and keep parts and accessories in safe and proper operating condition at all times. For each vehicle it controls for 30 consecutive days, the carrier keeps:

• an identification of the vehicle — company number if marked, make, serial number and year, plus who furnished it if the carrier does not own it;
• a means to indicate the nature and due date of the inspection and maintenance operations to be performed — in other words, a schedule;
• a record of inspections, repairs and maintenance showing their date and nature; and
• for buses, a record of tests on pushout windows, emergency doors and emergency door marking lights, which must be inspected at least every 90 days.

The records stay where the vehicle is housed or maintained for one year, and for six months after the vehicle leaves the carrier’s control. The rule does not set service intervals. Apart from bus emergency exits and the DOT annual inspection — at least every 12 months under 396.17 — the carrier decides them.

Vans, pickups and other vehicles below the commercial threshold have no federal PM rule, but the same structure applies. Leases and manufacturer warranties commonly expect a vehicle to be maintained to schedule, and the records are how you show it was.

Building the schedule, step by step

1. List every unit

One row per vehicle and trailer: unit number, VIN, year, make and model, who owns or leases it, and the current odometer reading — engine hours for equipment and units that idle for long stretches. This doubles as the identification record 396.3 asks for.

2. Choose the trigger for each service

• Miles for wear: oil, filters, tires, brakes.
• Calendar for time: the DOT annual, registrations and permits, and fluids that age whether or not the vehicle moves.
• Engine hours for equipment, and for vehicles that idle or run power take-off for long stretches, where the odometer understates the work.
• Whichever comes first when the manufacturer gives both a mileage and a time interval.

3. Take intervals from the severe-service schedule

Most owner’s manuals publish a separate schedule for severe or special operating conditions: frequent stop-and-go driving, extended idling, towing, short trips. Delivery routes and service work usually fit that description. Start there rather than with the normal schedule or a round number, and take engine and transmission intervals from their makers’ maintenance guides where they differ.

4. Group the work into PM levels

Truck fleets commonly group services into levels, often labeled A, B and C: a short, frequent service; a fuller one at a multiple of that interval; and a major service less often. Grouping keeps a vehicle down once instead of three times. What goes into each level is yours to define — the template below shows the structure.

5. Count from real mileage

A mileage interval is only as good as the odometer reading it is counted from: next due is the mileage at the last service plus the interval. Take a reading at every inspection, and a vehicle that is 3,000 miles past due shows up as exactly that, instead of looking current on a spreadsheet last updated a month ago.

6. Record the work

For every completed service, keep the date, the odometer, what was done, who did it, parts and cost, with the invoice attached. That is the “date and nature” record 396.3 asks for, and the history you need for warranty claims, lessors and keep-or-replace decisions.

7. Review the intervals

If the same component keeps failing between services, the interval is wrong for your duty cycle — shorten it for that vehicle type. If services keep finding nothing, there may be room to lengthen an interval, within the manufacturer’s limits.

A PM schedule template

Adapt the rows to your vehicles. Intervals marked “per manufacturer” come from each model’s severe-service schedule; the regulatory rows apply to commercial motor vehicles.

For tire lines and how to measure, see minimum tire tread depth for trucks; for the daily check, the CDL pre-trip inspection checklist and DVIR requirements.

Frequently asked questions

Sources. eCFR: 49 CFR 396.3 (as amended July 21, 2026) and 396.17. This guide summarizes federal rules for general information; it is not legal advice. Check the current regulations, your lease and your manufacturer’s maintenance schedule.

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