Federal regulations on diesel engines have been around for more than 50 years, and as environmental concerns become more dire, the regulations have grown stricter. But how does that affect you as a diesel truck owner?
Model year 2027 trucks must comply with stricter nitrogen oxide (NOx) emissions standards, requiring reductions of up to 80% compared with current regulations. This marks one of the most significant regulatory changes the trucking industry has faced in recent years. However, owners of diesel trucks from other model years should not assume they are unaffected. Increased regulatory oversight and emissions enforcement continue to extend beyond 2027 model year vehicles.
Before 2027, it’s important to understand that the new emissions standards do not apply retroactively to older model-year trucks. However, all diesel trucks remain subject to existing EPA emissions regulations and must stay compliant. Operating a truck that fails to meet these requirements can result in failed inspections, costly repairs, fines, or other enforcement actions. Regardless of your truck’s model year, maintaining a properly functioning emissions system is essential to ensuring compliance
Older Truck Issues
As regulations tighten and enforcement attention grows, older trucks with worn or neglected emissions systems can become expensive problems in a hurry, whether that means a failed inspection or a costly repair that could have been caught early.
Common trouble spots include exhaust gas recirculation (EGR) coolers and valves. Symptoms may begin with a check engine light, rough idle and a drop in fuel efficiency, but they can become serious. In the worst cases, if these conditions are ignored too long, coolant contamination can occur, which can lead to engine damage.
Another area worth examining is the diesel exhaust fluid (DEF) system and sensors. Any of these sensors can fall out of spec or fail outright with age. And if the system can’t verify that everything is working correctly, that’s when the derate comes into play. The truck can’t confirm NOx is being properly treated, so the EPA-mandated logic forces the engine power and speed down in stages to push you to get it fixed.
Emissions Experts
At Gray Diesel & Equipment Services, we have emissions experts on staff who can assist you with your diesel truck. We can help you keep your truck running efficiently while supporting compliance with federal, state and local regulations. Contact us and schedule an appointment.