ELD Mandate Basics and Install Checklist

Note: This article summarizes federal rules in 49 CFR Part 395 for general information. It is not legal advice. Check the current regulations and FMCSA guidance, and talk to your compliance team about your specific operation.

What the ELD rule does

The Federal Motor Carrier Safety Administration (FMCSA) requires most drivers who must keep records of duty status (RODS) to use an electronic logging device instead of paper logs. An ELD records driving time automatically. To do that, the device must be synchronized with the vehicle’s engine so it can capture engine power status, vehicle motion, miles driven, and engine hours.

That engine connection is why installation matters. An ELD that is not properly connected to the engine cannot do its job.

Who is not required to use an ELD

Under 49 CFR 395.8(a)(1)(ii)(A), a carrier may let a driver keep paper RODS instead of using an ELD when the driver operates a commercial motor vehicle:

In a way that requires RODS on not more than 8 days in any 30-day period
In a driveaway-towaway operation where the vehicle being driven is part of the shipment
In a driveaway-towaway operation where the vehicle being transported is a motor home or recreational vehicle trailer
That was manufactured before model year 2000, as shown by the VIN on the vehicle’s registration

Separately, drivers who qualify for the short-haul exception in 49 CFR 395.1(e)(1) do not have to keep RODS at all, so they do not need an ELD. In short, the driver must stay within a 150 air-mile radius of the normal work reporting location and be released within 14 consecutive hours, and the carrier must keep accurate time records for 6 months. Read the rule for the full conditions.

Use only a registered device

Carriers that must use ELDs may only use devices on FMCSA’s registered ELD list (49 CFR 395.22(a)). ELD providers self-certify their devices, and FMCSA removes devices that fail to meet the technical requirements. When a device is revoked, FMCSA publishes a deadline for carriers to switch. After that, a carrier still using it is treated as having no ELD.

Revocations are not rare. FMCSA removed a number of devices from the list in 2025. Check the registered and revoked lists at eld.fmcsa.dot.gov before you buy, and check again periodically.

What has to be in the cab

Under 49 CFR 395.22(h), drivers must have an ELD information packet in the vehicle containing:

Instructions on the ELD’s data transfer methods and how to produce hours-of-service records for a safety official
Instructions on reporting ELD malfunctions and keeping records during a malfunction
A supply of blank graph-grid paper logs for at least 8 days

Many fleets also keep the device user’s manual in the cab or in the driver app. Make the packet part of your install sign-off so no truck leaves without one.

Keeping records

Carriers must keep ELD records and a backup copy, on a separate device from the original, for 6 months (49 CFR 395.22(i)). Your platform usually handles this, but confirm how and where.

When an ELD malfunctions

49 CFR 395.34 sets out what happens when a device fails:

Who	What	When
Driver	Note the malfunction and notify the carrier in writing	Within 24 hours
Driver	Reconstruct RODS for the current 24 hours and previous 7 days on paper, unless they can be retrieved from the ELD	Right away
Driver	Keep paper logs until the ELD is fixed	Until repaired
Carrier	Repair, replace, or service the ELD	Within 8 days of discovery or driver notice, whichever is earlier
Carrier	Request an extension from the FMCSA Division Administrator for its home state, if needed	Within 5 days of driver notice

An 8-day clock is short when trucks are spread across states. A plan for fast swaps or repairs, with spare units and someone who can get to the truck, is part of ELD compliance.

ELD install checklist

Before install

Confirm the device model is on FMCSA’s registered list
Confirm each vehicle’s model year and whether it is covered
Identify the connection for each vehicle: 9-pin J1939, RP1226, OBD-II, or other
Have the correct harness and any adapters for each vehicle type
Set up the vehicles and drivers in the platform

During install

Record serial number, VIN, unit number, and odometer
Connect to the engine data source per the maker’s guide
Mount the device and any display securely, out of the driver’s way
Route cables away from heat, sharp edges, and moving parts

Before sign-off

Start the engine and confirm the ELD shows engine connection
Confirm odometer and engine hours match the vehicle
Confirm the device appears on the platform and is assigned to the right vehicle
Have a driver log in and confirm duty status changes work
Place the ELD information packet and 8 days of blank logs in the cab
Photograph the install and file the record

Train drivers on the basics

Most roadside problems are not hardware problems. Drivers should know how to log in, change duty status, review and certify logs, transfer data to an officer, and what to do if the device shows a malfunction. A short hands-on session at install time saves a lot of calls later.

How TCI can help

TCI Installations installs ELDs from major platforms to each maker’s standards, verifies engine connection and platform reporting before sign-off, and documents every unit. We also train drivers on the device they will be using. We can work with the one you already have or help you think through options.

Sources

49 CFR 395.8 (Cornell LII)
49 CFR 395.1(e)(1) (Cornell LII)
49 CFR 395.22 (Cornell LII)
49 CFR 395.34 (Cornell LII)
49 CFR Part 395, Subpart B, Appendix A, Functional Specifications for ELDs (Cornell LII)
FMCSA, Registered and Revoked ELD lists
FMCSA newsroom, FMCSA removes three devices from list of registered ELDs

ELD Mandate Basics and an Install Checklist for Fleet Managers