1. Which Heavy-Duty Rules Apply to Your Business?
Start by identifying who manufactures, owns, or operates each vehicle. Advanced Clean Trucks (ACT), Advanced Clean Fleets (ACF), and Clean Truck Check serve different purposes. A manufacturer sales standard does not automatically require a carrier to replace its fleet.
Separate Manufacturers from Fleet Operators
Classify the business before reviewing deadlines. A truck may trigger different rules at the point of sale and while in service.
| Business Role | Rule to Examine |
|---|---|
| Manufacturer | ACT sales, credits, and reporting |
| Private carrier | ACF non-enforcement and Clean Truck Check |
| Public agency | ACF public-fleet obligations |
Manufacturer
- Rule to ExamineACT sales, credits, and reporting
Private carrier
- Rule to ExamineACF non-enforcement and Clean Truck Check
Public agency
- Rule to ExamineACF public-fleet obligations
Automotive regulatory compliance also involves the relevant engine certification requirements.
Match the Rule to Each Vehicle
A fleet inventory is more useful than a general statement that a company operates heavy-duty trucks. Record what each vehicle does and where it travels.
- List weight ratings, engine types, and model years.
- Identify owned, leased, and contracted vehicles separately.
- Flag trucks registered elsewhere but operating in the state.
Public agencies should separately examine current rules and CARB guidance concerning contracted services.
2. How Do Federal Decisions Affect CARB Requirements?
Clean Air Act § 209(b), 42 U.S.C. § 7543(b), provides a waiver process for certain state standards for new vehicles. Federal action affecting particular waivers has created disputes over enforcement. That issue differs from obligations under an in-use inspection program.
Verify ACT and Engine Standards Individually
ACT is addressed in 13 CCR §§ 1963–1963.5. Federal actions and related litigation have affected the legal framework for certain heavy-duty standards.
- Identify the model year and the rule at issue.
- Review federal waiver actions, court proceedings, and current CARB manufacturer advisories.
- Check sales reporting separately from engine certification.
Do not treat a proposed rule change or an ongoing challenge as a final ruling on compliance.
Distinguish ACF Non-Enforcement from Repeal
CARB states that it is not enforcing ACF High Priority Fleet and Drayage provisions after withdrawing its federal waiver request. State and local government fleet requirements remain a separate matter.
- Record the non-enforcement guidance relied upon.
- Check public-fleet requirements and available flexibility.
- Confirm whether any proposed amendment has taken effect.
CARB's 2026 public-fleet guidance addresses contracted vehicles and proposed changes; verify effective text before relying on an amendment.
3. Which Reporting and Testing Duties Remain?
Clean Truck Check remains in effect for covered vehicles. It addresses operating vehicles, not manufacturer zero-emission sales targets. A federal decision concerning the state's air-quality implementation plan did not terminate the program's reporting, fee, or testing obligations.
Review Clean Truck Check by Vehicle
The program generally covers diesel, alternative-fuel, and qualifying hybrid vehicles with a GVWR over 14,000 pounds operating on public roads, subject to exclusions.
- Report covered vehicles through CTC-VIS.
- Pay the applicable annual compliance fee.
- Arrange required emissions tests and retain results.
Out-of-state registration does not necessarily exempt a truck operating in the state.
Assign Records to the Responsible Business
Operators can lose track of duties when testing, dispatch, and registration sit with different teams. Record who is responsible before a deadline arrives.
- Match vehicle records to actual operations.
- Identify who arranges testing and submits CTC-VIS reports.
- Keep dated results and any agency correspondence.
Freight and logistics regulation may raise separate operating and contractual issues.
4. How Should Businesses Prepare for a CARB Review?
A useful compliance plan identifies the exact rule and the reason it applies. Keep current duties separate from proposed changes, litigation, and agency enforcement notices. Update the analysis before major vehicle purchases or reporting decisions.
Create a Rule-by-Rule Compliance Register
Give each requirement an owner and a dated source. This makes it easier to revisit decisions when the regulatory position changes.
- Scope: Identify vehicles and business activities covered.
- Status: Record effective text and relevant agency guidance.
- Action: Assign testing, reporting, and record retention.
Use a documented regulatory compliance process rather than a general assumption about CARB rules.
Resolve Gaps before Responding to CARB
If reports and operating records differ, determine which facts need correction. Preserve the original materials and record why the company revised its assessment.
- Compare fleet lists with registrations and vendor records.
- Retain submissions, notices, and testing documentation.
- Request legal review when coverage or enforcement is disputed.
A documented assessment supports a more precise response but does not guarantee an agency outcome.
5. Frequently Asked Questions
Do out-of-state trucks need Clean Truck Check?
Covered vehicles operating on public roads may need to comply even if registered elsewhere. Check the applicable vehicle exclusions.
Does ACF non-enforcement end Clean Truck Check duties?
No. They are different programs. CARB continues to require reporting, fees, and testing for vehicles covered by Clean Truck Check.
Are contracted trucks automatically subject to public-fleet ACF rules?
Not automatically. Review the current regulation and CARB's guidance on public services performed under contract, including the status of proposed amendments.
Can a company rely on a proposed amendment?
A proposal is not an effective rule. Check adoption and effective dates, along with any separate enforcement guidance.
6. Discuss Heavy-Duty CARB Compliance with SJKP
A single fleet may face different requirements across its trucks and operations. SJKP's attorneys can assess applicable regulatory text, agency guidance, reporting records, and disputed coverage questions. Contact SJKP to discuss the obligations affecting your business.
14 Oct, 2026
