Tennessee Truck Emissions & Clean-Truck Rules
Tennessee ended vehicle emissions testing in its five testing counties on January 14, 2022, and Nashville's Davidson County dropped its own on February 5, 2022. Nothing replaced it. All 95 counties now register trucks with no emissions check. Your only obligation is the federal EPA engine standard built into the truck (40 CFR Parts 86/1036/1037). Don't delete the DPF or SCR. Federal anti-tampering law bites up to about $45,000 per engine, testing program or not.
A detail here is flagged medium confidence — confirm with the state environmental agency or EPA before you rely on it.
How Tennessee handles truck emissions
Tennessee ended vehicle emissions testing in its five testing counties on January 14, 2022, and Nashville's Davidson County dropped its own on February 5, 2022. Nothing replaced it. All 95 counties now register trucks with no emissions check. Your only obligation is the federal EPA engine standard built into the truck (40 CFR Parts 86/1036/1037). Don't delete the DPF or SCR. Federal anti-tampering law bites up to about $45,000 per engine, testing program or not.
What applies to you
- Program: Federal EPA only
- State rule: No state heavy-duty emissions program. Tennessee ended vehicle emissions testing in its five testing counties (Hamilton, Rutherford, Sumner, Williamson, Wilson) on January 14, 2022, and Nashville's Davidson County dropped its own program on February 5, 2022. No county tests today. Federal EPA engine standards only. Keep your emissions system intact and functional.
- Penalty: No state emissions fine. Federal EPA anti-tampering penalties apply: up to about $45,000 per tampered vehicle or engine and roughly $4,500 per defeat device sold or installed.
- DPF / DEF: Federal EPA equipment nationwide, never delete or tamper with it
Tennessee Emissions FAQ
Does Tennessee have a truck emissions program?
What is the emissions rule for trucks in Tennessee?
What is the penalty for an emissions violation in Tennessee?
Reference information for planning, not legal advice. Traffic laws change and this can be out of date, so always confirm the current statute and obey posted signs before you rely on it. Last reviewed July 2026. Source: https://www.nashville.gov/departments/health/environmental-health/vehicle-inspection. See our Terms & Disclaimer.
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