Work Truck Logo
MenuMENU
SearchSEARCH

[Op-Ed] The Hidden Dangers of Tampering with Emissions Control Devices – Fleet Edition

Fleet managers beware: illegal emissions modifications could put your business at risk. Discover how to protect your fleet and stay compliant.

September 18, 2024
Photo of pickup truck emitting toxic smoke with ROLLING COAL? in large font

Fleet managers face increasing risks as illegal emissions modifications in diesel repair shops threaten compliance, sustainability, and environmental responsibility.

Photo: Work Truck 

5 min to read


In a time when environmental responsibility is more than just a regulatory requirement but an industry priority, the recent sentencing of a diesel repair shop in Lane County, Oregon, highlights a significant risk for fleet managers. The repair shop, which holds an A+ Better Business Bureau (BBB) accreditation [as of publication], knowingly and intentionally tampered with pollution monitoring devices on at least 184 vehicles between 2018 and 2022, in direct violation of the Clean Air Act, according to the U.S. Attorney's Office, District of Oregon.

According to court documents, the shop charged customers approximately $2,300 per vehicle for these modifications, resulting in over $378,000 in unlawful revenue over four years.

Ad Loading...

The illegal process, often called "Delete and Tune," involves disabling emissions control systems on diesel vehicles, allowing them to run without the environmental safeguards designed to reduce harmful pollutants. The trucks can emit toxic pollutants at far higher levels, contributing to air quality degradation, public health risks, and the notorious "rolling coal" phenomenon — where black soot is deliberately belched from the exhaust.

While this might offer short-term performance or fuel efficiency improvements, the long-term consequences — both legally and environmentally — are severe.

This case serves as a critical reminder for fleet managers to be vigilant about the repair shops and services they use. When a shop with a seemingly stellar reputation, such as an A+ BBB rating, can be involved in illegal practices, it becomes clear that appearances can be deceiving. It's crucial to recognize that even reputable businesses might recommend "fixes" that violate the law and put your fleet's integrity and environmental impact at risk.

Fleet FAQ: What is rolling coal? "Rolling coal" refers to the practice of modifying a diesel truck to intentionally produce excessive amounts of black exhaust smoke. This is done by altering the truck's engine settings or removing emissions control equipment, such as the diesel particulate filter (DPF) or exhaust gas recirculation (EGR) system.

The Hidden Threat to Fleet Operations

Why does this matter to you as a fleet manager? I'm sure many of you think this is a long-shot connection to fleet management. But let me surprise you.

A few quick web searches provided more news items and press releases on business owners tampering with emissions control devices than I thought I'd find.

Ad Loading...

In 2023, a towing company business owner in Kirbyville, Missouri, was sentenced for "leading a conspiracy to illegally tamper with the emissions controls of the company's diesel towing vehicles," according to the United States Attorney's Office, Western District of Missouri. In the same year, three companies and eleven individuals were charged with violating the Clean Air Act in an aftermarket scheme to disable the emissions control systems of semi-trucks, according to the U.S. Attorney's Office, Western District of Michigan.  

This phenomenon is seen not only in beefy pickup trucks in rural towns but also in small fleets around the country.  

Navigating the Legal and Environmental Risks of Emissions Modifications in Fleet Management

As a fleet manager, your choices can have legal and environmental consequences. Illegal emissions modifications, whether knowingly or unknowingly performed by repair shops, put your fleet at risk of hefty fines, legal scrutiny, and reputational damage. Beyond the immediate cost-saving temptation, these practices jeopardize your commitment to sustainability and compliance with federal and state regulations.

It's time to reevaluate how we approach fleet maintenance to ensure the longevity and responsibility of our operations.

1. Reducing Legal and Financial Risks

Fleet managers who unknowingly (or worse, knowingly) use shops that offer illegal emissions modifications risk more than a slap on the wrist. The Clean Air Act imposes significant penalties, and your fleet could be subject to investigations, fines, or even potential shutdowns if found in violation.

Ad Loading...

In the Oregon case, the repair shop’s customers knew what they were asking for. However, some could be unwittingly exposed to legal liability simply because they trusted a shop to handle emissions controls "their way." A one-time charge of $2,300 might seem like a cost-effective repair for the promise of increased fuel efficiency, but the true costs could be catastrophic down the road.

2. Growing Environmental Responsibilities

The fleet industry has been moving toward cleaner, more sustainable operations. Investing in alternative fuels, hybrid, or electric vehicles has become part of many fleets' long-term strategies. Tampering with pollution control devices is a direct contradiction to these efforts.

By participating in practices like Delete and Tune, fleets contribute to worsening air quality, increased public health risks, and a larger carbon footprint. In short, it undermines industry progress and the broader movement toward environmental responsibility.

3. Trusting the Right Partners

When a repair shop recommends a modification, fleet managers must ask the right questions and ensure that the recommendations are legal and in accordance with environmental regulations. It's easy to be swayed by promises of better fuel efficiency or reduced maintenance costs, but fleet professionals must prioritize compliance and sustainability.

If a service provider suggests bypassing emissions systems for better performance, that's a red flag. Partner with businesses that understand modern diesel engines' complexities and stay committed to following the rules. Only you can be the expert fleet manager your company needs. 

Ad Loading...

4. Ensuring Reputation and Compliance

Your fleet and business's reputation are tied to your compliance with federal and state regulations. Any involvement with emissions tampering or illegal modifications can lead to reputational damage, making it harder to secure partnerships, clients, or even drivers. It can also affect your ability to attract and retain top talent.

Many workers today value companies that align with sustainable practices and environmental stewardship. Cutting corners by using services offered by businesses that break the law jeopardizes this reputation.

This case, and the cases of businesses knowingly participating in these actions, serves as a wake-up call for fleet managers everywhere. Even reputable businesses may engage in unethical practices behind the scenes, and it's your responsibility to stay informed, ask the right questions, and ensure that your fleet's repairs and upgrades comply with all environmental regulations.

Driving Thoughts

The temptation to save a few dollars or boost performance with emissions modifications isn't worth the risk. Not only is it illegal, but it also compromises the future of our industry. As fleet professionals, we are tasked with keeping our vehicles running efficiently, safely, and responsibly. The path forward requires adherence to environmental standards, not shortcuts around them.

Stay proactive and protect your fleet’s future! Don't let illegal emissions modifications jeopardize your operations. Partner with reputable repair shops that prioritize compliance and sustainability. Ensure every maintenance decision aligns with environmental regulations and industry standards. Have questions or need guidance? Reach out today to learn how to safeguard your fleet against hidden risks and ensure its long-term success.

Ad Loading...

Have any thoughts to add? Please drop a comment below or email me, and let's chat!

Lauren Fletcher
Lauren.Fletcher@bobit.com

Subscribe to Our Newsletter

More Blog Posts

Sppoky broken down old pickup truck on a halloween road
Chatty Chassis•by Lauren Fletcher•October 26, 2026

4 Ways to Keep Fleet Nightmares Off Your Halloween Schedule

Don't let the fear of vehicle mishaps spook you! Check out these four tips to ensure your work truck fleet stays on the road, safe and sound, during this hair-raising season.

Read More →
Red pickup truck wiht a shorter driver behind the wheel
Chatty Chassis•by Lauren Fletcher•September 29, 2026

Short Drivers Need to Be Part of the Work Truck Spec, Too

The average truck driver may be around 5'9" for men and 5'4" for women, but fleets aren't spec'ing trucks for averages. Here's what shorter drivers need fleets to consider, from seat height and visibility to 360 cameras, seat belts, and cab access.

Read More →
Cartoon illustration of a fleet driver using a handheld controller to play a video game on a vehicle’s center infotainment screen while parked.
Chatty Chassis•by Lauren Fletcher•September 23, 2026

Does Your Fleet Policy Cover In-Vehicle Gaming?

As in-vehicle gaming, streaming, and connected entertainment expand, fleet policies may need an update. Here’s what fleet managers should be thinking about now.

Read More →
Ad Loading...
Aluminum billets and shavings beside a warning sign reading “Tariffs Just Ahead.”
Chatty Chassis•by Lauren Fletcher•September 18, 2026

You Can't Tariff an Aluminum Smelter Into Existence

The U.S. wants to rebuild domestic aluminum production, but work truck manufacturers still need material today. What happens to costs and supply in the meantime?

Read More →
Canadian and U.S. flags frame a red “TARIFFS” stamp on a document, illustrating escalating trade tensions between the two countries.
Chatty Chassis•by Lauren Fletcher•August 24, 2026

Can America Replace Canadian Truck Production Without Hurting U.S. Fleets?

U.S. tariffs are targeting Canadian truck production, but Ford and GM show why moving that manufacturing south isn’t so simple. After 60 years of building one North American supply chain, what could fleets lose by pulling it apart?

Read More →
Graphic with the headline “WHY FLEET NEEDS VETERANS” in bold red and white text over a dark textured background, with a folded American flag draped across the bottom.
Chatty Chassis•by Lauren Fletcher•August 20, 2026

The Fleet Skills We Keep Missing on Veterans’ Resumes

What if some of the strongest candidates are already out there, but we are overlooking them because their experience is written in a language our industry does not always recognize?

Read More →
Ad Loading...
A handheld vehicle diagnostic scanner beside several wrenches on a dark wood surface, with the words “Way Beyond Wrenches” in large white text.
Chatty Chassis•by Lauren Fletcher•July 15, 2026

Technicians Are Doing More Than Turning Wrenches

Technicians do far more than repair vehicles. Six professionals reveal the problem-solving, pressure, and pride behind keeping fleets moving.

Read More →
Composite image featuring two archival photos of Lauren Fletcher and Bobit Business Media founder Ed "Coach" Bobit. On the left, a younger Lauren stands smiling beside Coach outdoors. On the right, the two sit together at a Bobit Business Media trade show booth surrounded by early Automotive Fleet, Government Fleet, and Fleet Financials magazines.
Chatty Chassis•by Lauren Fletcher•June 30, 2026

WWCD? What Would Coach Do?

A personal reflection on Ed "Coach" Bobit, the mentor who shaped my career, and why I still ask myself one question 12 years later: WWCD?

Read More →
Silhouettes of a diverse group of men and women helping each other climb a mountain at sunset. Several people reach down to assist others while a group stands together at the summit, symbolizing opportunity, leadership, collaboration, and support. Overlay text reads, "The Future of Fleet Depends on Who Gets a Seat."
Chatty Chassis•by Lauren Fletcher•June 23, 2026

What the Fleet Industry Still Gets Wrong About Talent

What can the fleet industry learn from the women helping shape its future? A look at talent, leadership, sponsorship, and why new perspectives drive progress.

Read More →
Ad Loading...
Split-screen graphic showing a glowing blue AI face and digital circuitry on one side facing off against a silhouetted human standing on a mountain at sunrise on the other, with bold text reading “AI vs Thought Leadership.”
Chatty Chassis•by Lauren Fletcher•May 20, 2026

AI Isn’t Killing Content, but Lazy Expertise Is

Thought leadership loses value when AI does the thinking. Here’s why authentic industry voices still matter most.

Read More →