haulrecordFMCSA data

Violation codes / 393.83G

49 CFR 393 · Parts and accessories

393.83G

What it means

Exhaust - Discharging at a point forward or directly below the driver or sleeper compartment

What the rule actually says

This violation cites 49 CFR 393.83, exhaust systems. The regulation reads:

(a) Every motor vehicle having a device (other than as part of its cargo) capable of expelling harmful combustion fumes shall have a system to direct the discharge of such fumes. No part shall be located where its location would likely result in burning, charring, or damaging the electrical wiring, the fuel supply, or any combustible part of the motor vehicle.

(b) No exhaust system shall discharge to the atmosphere at a location immediately below the fuel tank or the fuel tank filler pipe.

(c) The exhaust system of a bus powered by a gasoline engine shall discharge to the atmosphere at or within 6 inches forward of…

The section continues.

49 CFR 393.83, Exhaust systems. Read the full section on eCFR

Quoted verbatim from the Electronic Code of Federal Regulations. Nothing here is a paraphrase, and nothing here is legal advice on a citation.

Times recorded50,79611% as often as 393.9, the most cited
How common74thof the 200 most cited codes, out of 2,372 that exist
Regulation393.83Parts and accessories

How often this comes up

This violation was recorded 50,796 times across the roadside inspections in the FMCSA file, making it the 74th most frequently cited code. Whether a given instance puts a vehicle or driver out of service is decided at the roadside by the inspector, not by the code itself, so the same violation can end a trip or simply be noted.

It sits under 49 CFR Part 393, which covers parts and accessories. To see it in context, look up a carrier and read its inspection history: the same code appearing repeatedly is a different signal from a single occurrence.

Look up a carrier's inspection record

Other parts and accessories violations

Counts are from the FMCSA Inspections and Violations file via data.transportation.gov. This describes how the violation is recorded, and is not legal advice on a citation.