ELDs Explained: How They Work, Who Needs One, and What They Cost

The Federal Motor Carrier Safety Administration (FMCSA) requires commercial motor vehicles (CMVs) to use ELDs to maintain a Record of Duty Status (RODS). This record is the official log of driving and on-duty time under the Hours of Service (HOS) rules. Manufacturers must register each device to meet the FMCSA mandate for ELDs.

Once installed, the device sends drive-time data to your fleet tracking system. Now you can see when trucks are running, how long drivers are on the road, and what’s happening day to day. That means more accurate records, fewer manual errors, and quicker access to the information you need during audits or inspections.

From there, it’s about understanding how it works in real life. We’ll break down how ELDs work, who needs one, and what to look for when choosing a system for your fleet.

How do ELDs work?

An ELD plugs into a vehicle’s engine control module and automatically records activity while the vehicle is running. It captures data such as engine hours, ignition status, and miles driven, so commercial drivers can maintain accurate records and remain in compliance.

Main types of data ELDs record:

• Service hours: Tracks driving time and on-duty hours to help drivers stay within legal limits
• Ignition status: Records when someone turns the engine on or off, showing the vehicle's use and idle time
• Miles driven: Logs distance traveled to support reporting and maintenance planning
• Engine hours: Captures total engine run time, which helps fleet managers know when to schedule service
• Vehicle movement: Detects when the vehicle is in motion to verify drive time
• Location data (when enabled): Uses GPS to show where the vehicle was during driving and status changes

Once recorded, the device sends the data to your ELD software, usually through a cellular connection. From there, you can review reports tied to your fleet management KPIs, such as fuel efficiency and average downtime, and some drivers can check their logs right from a smartphone app. 

And if you're starting a fleet safety program, this steady flow of information makes it easier to spot patterns and keep everyone on the same page, without chasing down paperwork.

What can an ELD do for my fleet? 

A registered ELD helps commercial truck drivers stay compliant with HOS rules set by the FMCSA and the U.S. Department of Transportation (DOT). Both agencies require most commercial drivers to use registered devices to record HOS. 

HOS rules set limits on how long drivers can operate before taking required breaks, including daily driving limits, total on-duty caps, and weekly maximum hours. The goal is to reduce driver fatigue and keep the roads safer.

Beyond compliance, ELDs also help with:

• Efficiency: Clear drive-time data helps plan routes and jobs with fewer surprises.
• Safety: Knowing when drivers are closer to meeting their HOS makes it easier to enforce your fleet safety policy.
• Fatigue prevention: Automatic logs flag when drivers are close to their limits.
• Accurate recordkeeping: Because ELDs connect directly to the engine and automatically record drive time, they prevent drivers from editing logs afterwards.
• Easier DOT inspections: Electronic records can be shared quickly during roadside checks.
• Clearer operations view: When paired with GPS vehicle tracking systems, you see driver hours and vehicle location in one place.

For many trucking businesses, ELDs mean less paperwork and fewer compliance headaches.

How are ELDs different from AOBRDs?

Automatic onboard recording devices (AOBRDs) were earlier versions of electronic logging technology. They recorded driving time but followed older technical standards, including limited location data and fewer rules for tracking edits.

Newly built ELDs must meet updated FMCSA requirements. They record drive time more precisely and follow strict rules for edits and data transfers. While the FMCSA temporarily grandfathered some AOBRDs, they were only allowed through December 16, 2019. 

What does an ELD need to meet FMCSA requirements?

To meet FMCSA rules, ELDs must connect to the vehicle’s engine control module (ECM) and automatically collect data without drivers having to write anything down manually. That automatic capture of raw data is the heart of compliance.

Here’s what makes an ELD compliant:

• Engine synchronization: The device must integrate with the ECM to automatically record engine power status, vehicle motion, engine hours, and miles driven.
• Automatic recording intervals: It must record all driving time and capture data at least every 60 minutes (or sooner), including date, time, location, engine hours, vehicle miles, and driver ID.
• Location accuracy rules: During on-duty driving, the location must be accurate within a one-mile radius. For authorized personal use, location precision must drop to a 10-mile radius to protect driver privacy.
• Data integrity and anti-tampering: The system cannot allow original driving records to be erased or altered. All edits must create an audit trail that shows who made the change and when.
• Driver accounts and review: The ELD must provide separate accounts for drivers and administrators. Drivers must review, certify, and annotate their logs at the end of each 24-hour period and respond to any unidentified driving records.
• Editing and annotations: Drivers can correct errors or add explanations, but the original record stays intact. Edits must be certified and documented.
• Data retention: The device must retain records for the current day and the previous seven consecutive days.
• Data transfer options: The ELD must support electronic transfer through either telematics (wireless web services or email) or local transfer (USB 2.0 or Bluetooth).
• Roadside display: It must display standardized log data for safety officials, including a daily header, a duty status graph grid, and detailed log information.
• Registration and certification: The manufacturer must self-certify the device and list it on the FMCSA’s Registered Devices list.

Vendors are also required to provide user manuals, malfunction instructions, and record-transfer guidance, so your team knows what to do if something goes wrong.

What ELDs does the FMCSA approve? 

Here are some examples of registered ELD providers:

• Linxup ELD solution: Linxup provides the Apollo ELD, which connects directly to the engine and runs on Linxup’s proprietary ELD software. It provides simple plug-and-play installation, fast setup, and easy access to HOS data through a user-friendly dashboard.
• Garmin eLog: It's a self-contained ELD device that plugs into the vehicle and pairs with a smartphone app. It does not require a monthly subscription, making it a straightforward option for smaller operations.
• Samsara ELD solutions: The hardware connects to the vehicle and transmits data over cellular networks to Samsara’s cloud-based fleet platform, where you can review logs, reports, and vehicle activity.
• Geotab ELD compliance solution: Geotab’s device integrates with its broader telematics platform, offering connections to maintenance tools, fuel reporting, IFTA tracking, and third-party fleet management systems.
• Motive (formerly KeepTruckin): Motive’s device connects to a mobile app for drivers and sends data via cellular connection to a management dashboard, allowing real-time log access and compliance reporting.

This is just a snapshot — the FMCSA list includes hundreds of self-certified devices you can reference before choosing an ELD trucking solution. You can see a full list on the FMCSA’s provider page.

What devices are not approved by the FMCSA? 

The FMCSA regularly reviews ELD providers and removes devices that don’t meet federal requirements under 49 CFR Part 395. 

This is the current list of removed devices as of March 2026. If your ELD is out of compliance, you must replace it with a device from the registered device list within 60 days of the announcement date.

Devices Not Approved by the FMCSA

If you continue using a revoked ELD, it’s treated like operating without one and can lead to citations or out-of-service orders. Drivers should use paper logs or logging software as a temporary backup.

Who needs to use ELDs?

Most commercial drivers who used to fill out a Record of Duty Status (RODS) now have to use an ELD instead. That means the federal mandate covers most commercial drivers. 

Here’s who the FMCSA expects to be on board:

• 10,001+ lb GVWR vehicles: Commercial motor vehicles with a gross vehicle weight rating (GVWR) or gross combination weight rating (GCWR) of 10,001 pounds or more operating in interstate commerce must follow the ELD mandate.
• Hazardous materials transporters: Drivers hauling hazmat that requires a safety permit must use an ELD, even when not leaving the state.
• Drivers recording official duty hours: If you’re counting drive time toward HOS, you must use compliant truck GPS solutions and ELD functionality instead of paper logs.

This requirement is part of the broader federal ELD mandate. By standardizing how drive time is recorded with ELD telematics, the FMCSA aims to improve safety data, reduce falsified logs, and make compliance easier for everyone.

Who is exempt from the ELD mandate?

Not every driver and not every vehicle is covered. Some common exceptions include:

• Older vehicles (pre-2000): Trucks built before model year 2000 don’t have the engine electronics needed for compliant ELD connections.
• Short-haul drivers: Drivers who operate within a limited radius (generally 150 air miles) and return to the same reporting location each day may qualify for the short-haul exemption if they meet duty-time limits.
• Driveaway-towaway operations: If you’re transporting a vehicle and the vehicle itself is the commodity being delivered, you may be exempt because the engine cannot be integrated with an ELD in the usual way.
• Short-term RODS use: Drivers who are required to keep RODS for 8 days or fewer within any 30-day period can continue using paper logs instead of an ELD.
• Certain paper RODS situations: Limited, specific operations that fall under temporary or defined regulatory exceptions may still use paper logs.

These exemptions matter, but they’re narrow. If you shoulder the responsibility of moving goods across state lines or maintain a modern fleet, a compliant ELD paired with reliable telematics is part of staying legal and running smarter.

How much do ELDs cost?

On average, hardware costs can range from $100 to $500 per vehicle, while monthly service fees typically fall between $15 and $60 per vehicle. Some companies offer the device at low or no upfront cost if you commit to a subscription plan.

Here's what actually drives the price:

• Hardware: Plug-and-play OBD-II devices are usually the most affordable and easiest to install yourself. Hard-wired units that connect directly into the vehicle’s system often cost more but may offer added reliability and deeper data access.
• Service fees: Most providers charge a monthly subscription for data storage, log reporting, system updates, and dashboard access. Over time, these fees are often the biggest part of your total investment.
• Features: Basic systems handle hours of service. More advanced options may include IFTA reporting, vehicle diagnostics, and GPS monitoring, and integrations that support smoother fleet dispatching.
• Professional installation: Some fleets choose expert installation, especially for hard-wired devices. That can add labor costs, but it may reduce setup errors.

Understanding these factors helps you decide what fits your operation. After all, what ELD compliance is for one fleet may look slightly different for another, depending on vehicle type, routes, and reporting needs.

Simplify ELD compliance with Linxup 

Understanding the rules is one thing. Managing them every day is another. When logs, inspections, and driver schedules all land on your desk, you need a system that keeps things simple. 

Linxup’s ELD solution connects directly to your vehicles, automatically records drive time, and syncs with easy-to-use software built for growing fleets. You get clear HOS records, real-time vehicle visibility, and reporting tools that support safer driving and smarter decisions. And no, you won't have to babysit spreadsheets or chase drivers down for missing logs.

Book a free demo to see how Linxup can help you stay compliant, organized, and in control of your fleet.

ELD FAQ

ELDs come with a lot of rules — and a lot of rumors. Here are answers to some of the most common questions people ask about ELDs.

Can drivers edit ELD logs? 

Yes, drivers can correct honest mistakes in their logs, such as selecting the wrong duty status. With a compliant truck driver ELD, the original record stays in place, and every edit is tracked with a timestamp and user ID. Intentional log tampering can lead to fines, violations, and even out-of-service orders.

Do all ELDs provide location data? 

Yes, compliant ELDs capture location every 60 minutes while moving. During on-duty commercial use, the location must be accurate within a one-mile radius. The system doesn't display exact street addresses. Instead, it converts GPS coordinates into an approximate location, typically showing the nearest city, town, or recognizable area.

Can I use RODS instead of ELDs? 

You usually can't use RODS instead of ELDs. If you’re required to keep a Record of Duty Status, you must use a compliant ELD. Paper logs are only allowed under specific exemptions, such as short-haul rules or pre-2000 engines.