49 CFR § 392.66 - Carbon monoxide; use of commercial motor vehicle when detected.

---
identifier: "/us/cfr/t49/s392.66"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 392.66 - Carbon monoxide; use of commercial motor vehicle when detected."
title_number: 49
title_name: "Transportation"
section_number: "392.66"
section_name: "Carbon monoxide; use of commercial motor vehicle when detected."
chapter_name: "FEDERAL MOTOR CARRIER SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "B"
subchapter_name: "FEDERAL MOTOR CARRIER SAFETY REGULATIONS"
part_number: "392"
part_name: "DRIVING OF COMMERCIAL MOTOR VEHICLES"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 504, 13902, 31136, 31151, 31502; Section 112 of Pub. L. 103-311, 108 Stat. 1673, 1676 (1994), as amended by sec. 32509 of Pub. L. 112-141, 126 Stat. 405-805 (2012); and 49 CFR 1.87."
regulatory_source: "33 FR 19732, Dec. 25, 1968, unless otherwise noted."
cfr_part: "392"
---


# 392.66 Carbon monoxide; use of commercial motor vehicle when detected.

(a) No person shall dispatch or drive any commercial motor vehicle or permit any passengers thereon, when the following conditions are known to exist, until such conditions have been remedied or repaired:

(1) Where an occupant has been affected by carbon monoxide;

(2) Where carbon monoxide has been detected in the interior of the commercial motor vehicle;

(3) When a mechanical condition of the commercial motor vehicle is discovered which would be likely to produce a hazard to the occupants by reason of carbon monoxide.

(b) [Reserved]

[60 FR 38747, July 28, 1995]