North American Class 8 net orders fell in September as commercial truck buyers weighed the approach of the U.S. Environmental Protection Agency's Phase 3 heavy-duty greenhouse gas standards, which take effect with model year 2027 trucks, according to truckpartsandservice.com.

The pullback is consistent with pre-buy hesitation patterns that have historically surfaced ahead of major emissions steps. Fleet operators face a clear branch point: take delivery of equipment built to current standards and absorb residual-value risk, or hold purchases for OEM model year 2027 builds carrying the tighter aerodynamic, tire, and drivetrain requirements.

EPA finalized the Phase 3 rule in April 2024. It applies to heavy-duty vehicles from model year 2027 through 2032 and targets a CO2 reduction of up to 60 percent from a model year 2026 baseline by 2032, with manufacturer compliance pathways covering advanced internal combustion, zero-emission powertrains, and limited credits for plug-in hybrid and certain natural gas units.

What does the 2027 standard change for fleet operators?

• CO2 limits tighten annually from MY 2027 through MY 2032
• Mandatory aerodynamic and tire-rolling-resistance improvements
• Expanded zero-emission deployment expectations in selected segments
• Broader in-use compliance testing and reporting

For waste and recycling haulers, the timing lands inside a multi-year replacement window. Most collection fleets refresh their trucks every seven to twelve years, meaning chassis ordered this year will run through the early 2030s under the new in-use assumptions.

The September dip also sits against a softer freight market. Several Class 8 segments entered 2025 with inventory levels roughly 20 percent above the ten-year average, according to industry tracking, and carriers have been returning parked units to service rather than placing fresh orders.

Refuse and recycling vehicles represent a relatively small share of overall Class 8 volume but a disproportionately large share of municipal and regional service contracts. Operators renewing those contracts during 2025-2026 must price in the cost differential between current build specifications and model year 2027-compliant chassis, which industry estimates place in the mid-single-digit-percent range for tractor units and lower for vocational models.

Used-truck pricing will track the same boundary. Equipment built before model year 2027 will see a step-down in cross-border and resale values as 2030 approaches, mirroring the curve seen after EPA 2010 and EPA 2024 steps. Leasing companies have already begun to widen residual-value guidance bands on 2025 and 2026 deliveries.

How are OEMs positioning for MY 2027?

Major Class 8 manufacturers have begun publishing model year 2027 specification sheets. Common features include updated steer tires, integrated trailer kits, predictive cruise control, and on some platforms factory-installed battery-electric and hydrogen fuel cell variants for selected duty cycles.

Order books for MY 2027 production are open, with build slots priced at premiums that vary by configuration. Vocational and refuse chassis, which carry heavier electrical loads for compaction equipment, are receiving specific design attention to preserve payload while meeting the new efficiency targets.

The next market checkpoint will be October net order data, which will clarify whether September's dip was a pre-buy hesitation spike or a sustained pullback tied to the 2027 regulatory cliff and freight cycle weakness. Fleet managers who deferred purchases in September will face a compressed decision window through the first quarter of 2026 if they want delivery before MY 2027 production ramps.