---
type: "Bill"
title: "Motor Vehicles - As enacted, clarifies that excessive or unusual noise or annoying smoke can be used to determine whether a muffler is in good working order and in constant operation as required by law; exempts farm tractors or implements of husbandry from this law; adds a defense to prosecution if certain evidence is provided. - Amends TCA Section 55-9-202."
description: "Motor Vehicles - As enacted, clarifies that excessive or unusual noise or annoying smoke can be used to determine whether a muffler is in good working order and in constant operation as required by law; exempts farm tractors or implements of husbandry from this law; adds a defense to prosecution if certain evidence is provided. - Amends TCA Section 55-9-202."
jurisdiction: "us/states/tn"
legislature: "Tennessee General Assembly"
session: "113"
identifier: "SB 434"
citation: "Tennessee SB 434 (113)"
classification: ["bill"]
subjects: ["Motor Vehicles"]
status: "enacted"
primary_sponsors: ["Crowe"]
version_count: 4
action_count: 23
vote_count: 3
first_action: "2023-01-24"
last_action: "2023-06-20"
source: "openstates"
source_identifier: "ocd-bill/78234e6e-6049-4b14-9b54-d5b08aaf2088"
source_url: "http://wapp.capitol.tn.gov/apps/BillInfo/default.aspx?BillNumber=SB0434&GA=113"
source_hash: "b927c1c755d40f01e3cc6732249d9081409f15be7f69763c2a46248bd48ebdd1"
vintage: "2026-07-01"
source_snapshot: "https://data.openstates.org/daily/2026-07-01/public.pgdump"
retrieved_at: "2026-07-06"
confidence: "reported"
tags: ["legislation", "bill", "us-tn"]
---

# Tennessee SB 434 (113) — Motor Vehicles - As enacted, clarifies that excessive or unusual noise or annoying smoke can be used to determine whether a muffler is in good working order and in constant operation as required by law; exempts farm tractors or implements of husbandry from this law; adds a defense to prosecution if certain evidence is provided. - Amends TCA Section 55-9-202.

## Version chain

The bill's text revisions, in order — the diff chain from filing to enrollment.

1. **Amendment HA0119** (committee substitute) — [source](https://www.capitol.tn.gov/Bills/113/Amend/HA0119.pdf)
2. **Amendment HA0193** (committee substitute) — [source](https://www.capitol.tn.gov/Bills/113/Amend/HA0193.pdf)
3. **Amendment SA0174** (committee substitute) — [source](https://www.capitol.tn.gov/Bills/113/Amend/SA0174.pdf)
4. **Current Version** (committee substitute) — [source](https://www.capitol.tn.gov/Bills/113/Bill/SB0434.pdf)

## Votes

- TRANSPORTATION AND SAFETY COMMITTEE: Recommended for passage with amendment/s, refer to Senate Calendar Committee Ayes 9, Nays 0 PNV 0 3/15/2023 Passed (2) — **9–0** (pass) · upper
- FLOOR VOTE: REGULAR CALENDAR PASSAGE ON THIRD CONSIDERATION 3/30/2023 Passed (1) — **54–28** (pass) · lower
- FLOOR VOTE: as Amended Third Consideration 3/23/2023 Passed (1) — **20–7** (pass) · upper

## Sponsors

- Crowe — primary (person)

## Timeline

The legislative action history — every referral, reading, and vote.

- **2023-01-24** Filed for introduction `filing`
- **2023-01-25** Introduced, Passed on First Consideration `introduction`
- **2023-01-26** Passed on Second Consideration, refer to Senate Transportation and Safety Committee `passage`
- **2023-03-01** Placed on Senate Transportation and Safety Committee calendar for 3/8/2023
- **2023-03-08** Placed on Senate Transportation and Safety Committee calendar for 3/15/2023
- **2023-03-08** Action deferred in Senate Transportation and Safety Committee to 3/15/2023
- **2023-03-15** Recommended for passage with amendment/s, refer to Senate Calendar Committee Ayes 9, Nays 0 PNV 0
- **2023-03-21** Placed on Senate Regular Calendar for 3/23/2023
- **2023-03-23** Engrossed; ready for transmission to House `receipt`
- **2023-03-23** Passed Senate as amended, Ayes 20, Nays 7, PNV 2 `passage`
- **2023-03-23** Senate adopted Amendment (Amendment 1 - SA0174)
- **2023-03-27** Rcvd. from S., held on H. desk.
- **2023-03-30** Passed H., Ayes 54, Nays 28, PNV 2 `passage`
- **2023-03-30** Am. withdrawn. (Amendment 2 - HA0193) `amendment-withdrawal`
- **2023-03-30** Am. withdrawn. (Amendment 1 - HA0119) `amendment-withdrawal`
- **2023-03-30** Subst. for comp. HB. `substitution`
- **2023-04-03** Signed by Senate Speaker `passage`
- **2023-04-03** Enrolled and ready for signatures `enrolled`
- **2023-04-05** Transmitted to Governor for action. `executive-receipt`
- **2023-04-05** Signed by H. Speaker `passage`
- **2023-04-17** Signed by Governor. `executive-signature`
- **2023-06-20** Effective date(s) 07/01/2023
- **2023-06-20** Pub. Ch. 164

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/78234e6e-6049-4b14-9b54-d5b08aaf2088`. Confidence: reported (aggregated from official Tennessee legislature records).