EPA Emissions Rules: What the 2027 Heavy-Duty Changes Mean for Indiana Fleets

2026 · Compliance · EPA

If you run Class 6–8 trucks (or equipment that lives in regen-land), you’ve probably heard about tighter emissions requirements coming for model year 2027 heavy-duty engines. Newer trucks are getting cleaner—and more complex. That’s good for air quality, but it also changes how fleets should plan maintenance.

What’s changing (plain English)

• New heavy-duty engines starting MY2027 are expected to meet tougher standards, which typically means more aftertreatment sophistication and tighter calibration.
• OEMs are also expected to support durability and warranty requirements—meaning fleets need clean records and proper service to protect coverage.

What you should do in 2026 to stay ahead

• Build an aftertreatment routine: DEF quality checks, dosing issues, DOC/DPF/SCREfficiency trends.
• Stop “drive it till it derates”: schedule a quick scan when you see repeat regens or odd fuel economy.
• Recordkeeping: keep PM logs, work orders, and fault history (it protects you when warranty questions come up).
• Train drivers: what regen messages mean and when to call before it becomes a tow.

Common fleet pain points we fix on-site

• Chasing the root cause behind repeated regens and derates
• Wiring/connectors and power/ground issues that look like “emissions problems”
• Preventing downtime with PM routines built around your routes and duty cycle

If you want a simple “emissions-ready PM add-on” that fits your yard schedule, we can build it into your service plan. Start at Services or request a quote on Contact.