---
type: "Bill"
title: "Commercial Vehicle Muffler Requirements"
description: "The act requires all commercial vehicles to have a muffler. The muffler must be located so that it may be visually inspected to ensure it is present, intact, and functioning properly; except that a muffler need not be visible for inspection if certain documentation is present in the commercial vehicle and available for inspection by a peace officer. Standards are set for the necessary documentation."
jurisdiction: "us/states/co"
legislature: "Colorado General Assembly"
session: "2025A"
identifier: "HB 25-1039"
citation: "Colorado HB 25-1039 (2025A)"
classification: ["bill"]
subjects: []
status: "enacted"
primary_sponsors: ["Brianna Titone", "Dylan Roberts", "Lesley Smith", "Marc Catlin"]
version_count: 9
action_count: 14
vote_count: 2
first_action: "2025-01-08T07:00:00+00:00"
last_action: "2025-05-15T06:00:00+00:00"
source: "openstates"
source_identifier: "ocd-bill/602387cf-38c2-459e-ade6-ea97888fa4ec"
source_url: "https://leg.colorado.gov/bills/hb25-1039"
source_hash: "356632e9a0170bf6453ecee3718a9062cf48873fbc8d446e4f289ccd5b20e71c"
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-co"]
---

# Colorado HB 25-1039 (2025A) — Commercial Vehicle Muffler Requirements

The act requires all commercial vehicles to have a muffler. The muffler must be located so that it may be visually inspected to ensure it is present, intact, and functioning properly; except that a muffler need not be visible for inspection if certain documentation is present in the commercial vehicle and available for inspection by a peace officer. Standards are set for the necessary documentation.

## Version chain

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

1. **Committee Amendment** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2025a_hb1039_s_app_001.pdf)
2. **Engrossed (04/17/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_eng.pdf)
3. **Final Act (05/13/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_enr.pdf)
4. **Introduced (01/08/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_01.pdf)
5. **PA1 (01/29/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_h_thl_01.pdf)
6. **Reengrossed (04/21/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_ren.pdf)
7. **Rerevised (05/01/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_rer.pdf)
8. **Revised (04/30/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/documents/2025A/bills/2025a_1039_rev.pdf)
9. **Signed Act (05/15/2025)** (committee substitute) — [source](https://leg.colorado.gov/sites/default/files/2025a_1039_signed.pdf)

## Votes

- BILL — **30–5** (pass) · upper
- BILL — **41–22** (pass) · lower

## Sponsors

- Brianna Titone — primary (person)
- Dylan Roberts — primary (person)
- Lesley Smith — primary (person)
- Marc Catlin — primary (person)
- A. Valdez — cosponsor (person)
- J. McCluskie — cosponsor (person)
- K. McCormick — cosponsor (person)
- M. Lukens — cosponsor (person)

## Timeline

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

- **2025-05-15T06:00:00+00:00** Governor Signed `executive-signature`
- **2025-05-13T06:00:00+00:00** Sent to the Governor `executive-receipt`
- **2025-05-13T06:00:00+00:00** Signed by the President of the Senate
- **2025-05-13T06:00:00+00:00** Signed by the Speaker of the House
- **2025-05-01T06:00:00+00:00** Senate Third Reading Passed - No Amendments `passage, reading-3`
- **2025-04-30T06:00:00+00:00** Senate Second Reading Special Order - Passed - No Amendments
- **2025-04-30T06:00:00+00:00** Senate Committee on Appropriations Refer Unamended - Consent Calendar to Senate Committee of the Whole `committee-passage`
- **2025-04-28T06:00:00+00:00** Senate Committee on Transportation & Energy Refer Unamended to Appropriations `referral-committee`
- **2025-04-22T06:00:00+00:00** Introduced In Senate - Assigned to Transportation & Energy `introduction`
- **2025-04-21T06:00:00+00:00** House Third Reading Passed - No Amendments `passage, reading-3`
- **2025-04-17T06:00:00+00:00** House Second Reading Special Order - Passed with Amendments - Committee, Floor
- **2025-04-15T06:00:00+00:00** House Committee on Appropriations Refer Unamended to House Committee of the Whole `committee-passage, referral-committee`
- **2025-01-28T07:00:00+00:00** House Committee on Transportation, Housing & Local Government Refer Amended to Appropriations `referral-committee`
- **2025-01-08T07:00:00+00:00** Introduced In House - Assigned to Transportation, Housing & Local Government `introduction`

## Source

OpenStates / OpenCivicData bulk snapshot [2026-07-01](https://data.openstates.org/daily/2026-07-01/public.pgdump); origin `ocd-bill/602387cf-38c2-459e-ade6-ea97888fa4ec`. Confidence: reported (aggregated from official Colorado legislature records).