EPA Removes DEF Sensor Requirement
Two months ago, the Environmental Protection Agency (EPA) started collecting data about Diesel Exhaust Fluid (DEF) system failures and the resulting derating that happens on trucks. Now, it has made its decision: a different method of testing for emissions will apply, but the DEF systems as it stands will disappear.
Details
When a DEF system failure occurs, a truck will go into a state of “derating”, lowering how much speed and power output it has until the problem is resolved. While first it would result in 15% less torque, it would eventually go on to put a speed limit of 25 miles per hour onto the truck.
Now, Lee Zeldin, head of the EPA, is changing the requirements to say that a NOx sensor can be used to derive the output of DEF emissions.
The problem with this change, however, is that fixing trucks that already have the DEF and derating software is not as simple as removing the system, which would trigger an alert to the truck’s built-in computer. Instead, a software and firmware update will need to be implemented in order to have the system removed in a way that will allow the truck to continue operation.
Conclusion
The implications of this change are clear for trucks that have not yet been built: it will decrease the weight of the truck, improving fuel efficiency marginally, and will have one less system tacked on that results in a higher price tag for trucks.
The real problem is reworking existing engine systems to remove the derating system and instead using the NOx sensors to calculate the rate of DEF-related emissions. The most likely outcome is that drivers who already have the system in place will simply continue driving until a derating event occurs, at which time the trucking company will pay a mechanic to take it out and update the software, or perhaps even keep it if it is cheaper. There are a few million trucks on the road with the software as it currently stands, so artifacts of this system will likely last for a handful of decades.
Other Trucking Articles You May Like
- Supreme Court Case May Have Broader Trucking Implications
- Transportation Secretary Duffy Speaks at Mid-America Trucking Show
- 2027 Engine Regulations on the Horizon
- ATA Truck Tonnage Index Hits 3-Year High
- ATA Asks Congress Nicely About Highway Bill Changes
- Georgia Lawmakers Suspend Fuel Tax for 60 Days
- Indiana May Plan Toll Road on I-70
- FMCSA Warns Against Selling or Buying DOT Numbers
- Class 8 Sales Jump Year Over Year in February 2026
- California Revokes 13,000 Non-Domiciled CDLs
ABOUT TOPMARK FUNDING
TopMark Funding is a top-rated semi-truck financing and trailer financing company located in Roseville, CA. We specialize in commercial trucking and heavy equipment. Our mission is to become your long-term financial partner by helping you grow your trucking business and fleet.
We’re not here for the short term; we’re on the long haul with you!
We have financing options for trailers, semi-trucks, commercial trucks, and small businesses. We have great rates, low down payments, and flexible monthly payments regardless of credit history.
Learn more about Trailer Financing.
Fill out the contact form or give us a call at (866) 627-6644. One of our truck financing specialists will contact you as soon as possible to go over your truck lease needs and learn more about you and your business financing goals.
