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How to read odometers accurately

By Verizon Connect March 19, 2025

In the world of fleet management, data is king. Among the myriad metrics that fleet managers track, one is essential: the odometer reading. Far from a simple number on a dashboard, accurate odometer readings are the cornerstone of effective fleet operations. They influence everything from maintenance schedules and safety protocols to regulatory compliance and cost management. 

Whether you're overseeing a small local fleet or managing a large interstate operation, understanding the importance of odometer accuracy can significantly impact your fleet's efficiency, safety and bottom line. This article will explore how odometers work, how that data matters to your fleet and how the Verizon Connect ECM odometer can help accurately track and utilize odometer information.

What is an odometer?

A vehicle odometer is a critical tool that records the total distance each vehicle in the fleet has traveled since its manufacture. It provides data to manage fleet operations efficiently, helping managers to assess to which degree fleet vehicles are safe, compliant and cost-effective to operate.

How odometers work

Understanding how an odometer works to achieve more accurate mileage tracking. Most modern fleet vehicles use digital odometers, which rely on electronic sensors that detect and calculate wheel rotations digitally. A speed sensor in the transmission or wheel hub counts pulses generated by the wheels. These pulses are then converted into a mileage reading by the vehicle's onboard computer and displayed electronically. Digital odometers often have additional tamper resistance, making them more difficult to manipulate.


 Why odometer data matters to your fleet 

As a core element of fleet management, accurate odometer data is crucial for maintaining fleet longevity, safety, compliance and cost efficiency. Here's how:

  • Maintenance scheduling: By tracking mileage, fleet managers can assess vehicle wear and manage replacements to maintain fleet reliability. Regular maintenance (e.g., oil changes, tire rotations, brake checks and other services) is often based on mileage intervals. Accurate odometer readings help fleet managers to see that each vehicle is serviced on time to mitigate breakdowns and extend vehicle life. 
  • Driver safety: Vehicles maintained according to mileage milestones are less likely to experience sudden breakdowns, tire blowouts or other issues that can compromise driver safety. Preventative maintenance based on real-time odometer readings helps to reduce the risk of on-road incidents and unplanned downtime.
  • Regulatory compliance: Many regulatory requirements involve mileage reporting, especially for commercial fleets. Precise odometer readings help to maintain compliance with local, state and federal regulations including:
  • Department of Transportation (DOT) compliance: For commercial vehicles, accurate odometer readings are required for DOT inspections and audits.1
  • International Fuel Tax Agreement (IFTA) reporting: IFTA requires mileage tracking across different states and provinces for tax reporting purposes. Odometer readings help fleet managers to report distance traveled and comply with these tax regulations.2
  • Mileage-based emissions regulations: Some regions have emissions standards tied to mileage, so odometer tracking helps demonstrate compliance with environmental standards.
  • Cost management: By monitoring mileage, fleet managers can calculate fuel efficiency over time, identify trends and pinpoint vehicles that require maintenance. These odometer readings enable data-driven decisions about scheduling, fuel costs and route optimization, which can help lower vehicle lifecycle expenses.

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Integration with telematics and fleet management systems

Many fleet management systems now incorporate telematics devices that connect to a vehicle’s onboard computer to capture odometer readings and transmit them to a centralized platform. This enables fleet managers to monitor mileage data remotely and in near real-time.

The odometer data is integrated into fleet management software, which allows managers to generate reports on vehicle utilization, mileage trends and maintenance needs. These analytics help to provide an accurate, timely and centralized view of fleet operations.

How the Verizon Connect ECM odometer on Reveal operates

The Verizon ECM (Engine Control Module) odometer on Reveal is a feature within Verizon Connect’s fleet management platform that captures and displays odometer readings directly from the vehicle's ECM. The ECM is a computer within the vehicle that controls and monitors essential functions, including mileage, fuel use, engine performance and various other diagnostics. By connecting directly to the ECM, Verizon’s telematics devices can pull actual, real-time odometer readings, which are then displayed on the Reveal platform. Here's how it works:

  • Data capture: A Verizon telematics device is plugged into the vehicle’s OBD-II port or ECM. This device captures data from the ECM, including the odometer reading, mileage, fuel consumption and other vehicle metrics.
  • Data transmission: The device transmits the captured data to the Reveal platform in near real-time or at set intervals, depending on your configuration. This data is then processed and updated on the platform.
  • User interface: Within Reveal, users can view the odometer readings of each vehicle, track mileage trends, schedule maintenance based on mileage intervals and receive alerts for service needs. See how to find and view data in Reveal.
  • Maintenance: By having access to precise odometer readings, fleet managers can set up preventive maintenance schedules based on accurate mileage instead of estimates, reducing the risk of unexpected breakdowns.
  • Reporting: The ECM odometer data is also integrated into various reports available on Reveal, such as mileage, fuel efficiency and usage reports, which help fleet managers make data-driven decisions on fleet performance and utilization.

From keeping track of timely maintenance and driver safety to maintaining regulatory compliance, the impact of precise mileage tracking reverberates across every aspect of fleet operations. 

As technology continues to evolve, with advanced telematics systems like Verizon Connect's ECM odometer on Reveal, fleet managers can access real-time, accurate odometer data. This wealth of information, when properly leveraged, can lead to smart decision-making, extended vehicle longevity, fleet sustainability and profitability. 

Schedule a free demo to learn more.

Sources:

Disclaimer: Verizon Connect does not provide legal advice and shall have no liability whatsoever for any damages that arise from, or are connected with, your use of this blog. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for legal advice. You should consult your own legal advisors to seek the proper advice with reference to any compliance-related information in this blog.


Verizon Connect

Verizon Connect Staff represents a team of professionals passionate about everything telematics. Get to hear about the latest trends, product features and industry best practices from the desk of Verizon Connect Staff.


Tags: Vehicle Maintenance

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