Violation code

393.24AL

Lighting-Headlamps not steady burning as required.

Not in SMSNon-OOS· FMCSA A&I All Violations

393.24AL is a Vehicle violation under 49 CFR §393.24AL. It is not scored in the SMS. Nationally it was cited 252 times in the last five years, with an OOS rate of 0.0%.

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National roadside inspection stats

as of 9/20/2026

Inspections

252

that found this code

Violations

252

total written

OOS rate

0.0%

0 OOS

Source: FMCSA roadside inspection data (last 5 years). The OOS rate is the share of these violations that led the officer to mark the driver or vehicle out of service.

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Not used in SMS BASIC scoring

Recorded on your inspection report and visible on the PSP, but contributes 0 points to CSA BASIC scores — even if cited Out-of-Service.

Violation group: Vehicle
Regulation §: 393.24AL
Severity weight: N/A
Used in SMS: No
Status: Active
Updated: 9/20/2026

Last updated September 2026

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What 393.24AL means — and how to avoid it

In plain English

In plain terms, 393.24AL is cited for lighting-Headlamps not steady burning as required. It falls under the FMCSA rules on parts and accessories needed for safe operation.

What the inspector checks

•Required lamps present, clean, and working — headlamps, tail, stop, turn, marker
•Reflective sheeting/reflectors intact
•Trailer cord and connections making contact

How to prevent it

✓Walk the lights on every pre-trip (have someone confirm brake/turn)
✓Carry spare bulbs/fuses and swap a dead lamp before rolling
✓Clean lenses and check the trailer plug for corrosion

How it affects your CSA

0 CSA points

393.24AL is not scored in the SMS. It adds 0 CSA points — even if written out-of-service — but it still appears on the inspection report and the driver’s PSP.

General guidance from the violation’s FMCSA classification — not legal advice, and not a substitute for the inspector’s findings or 49 CFR.

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Challenging 393.24AL through FMCSA DataQs

If this violation was written incorrectly, here are the angles trucking-safety managers use to contest it. Playbook: Codes not used in SMS scoring.

Common ways to challenge this code

Not used in SMS — should not affect BASIC
This code is on the inspection report but is excluded from SMS BASIC scoring per Appendix A. Use DataQs to correct the underlying data quality issue if the code was written in error, but understand it does not affect the CSA percentile.
Evidence that wins
- ✓FMCSA SMS Methodology Appendix A reference
- ✓Underlying inspection report

Common pitfalls — avoid these

⚠These codes still appear on PSP — challenge the data if the cite was wrong

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Other Vehicle codes

Codes under the same FMCSA violation group

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Frequently asked questions about 393.24AL

What does violation 393.24AL mean?

393.24AL is the FMCSA roadside-inspection violation code for "Lighting-Headlamps not steady burning as required.", part of the Vehicle group, cited under 49 CFR §393.24AL.

What BASIC does 393.24AL affect?

393.24AL is not scored in any CSA BASIC. It is recorded on the inspection report and appears on the PSP, but it contributes 0 points to a carrier's SMS BASIC percentiles.

Is 393.24AL an out-of-service (OOS) violation?

No. 393.24AL is not an out-of-service violation, so on its own it does not trigger an out-of-service order at the roadside.

How many CSA points does 393.24AL add?

393.24AL adds 0 CSA points because it is not used in SMS scoring, even when written out of service.

How can a driver prevent 393.24AL?

Walk the lights on every pre-trip (have someone confirm brake/turn); Carry spare bulbs/fuses and swap a dead lamp before rolling; Clean lenses and check the trailer plug for corrosion.

Can 393.24AL be challenged through DataQs?

Yes. If you believe 393.24AL was recorded in error, you can file a Request for Data Review (RDR) through the FMCSA DataQs system with supporting evidence. A successful challenge can remove or correct the violation on your record.

Keep going

CSA points calculator How to challenge a violation Draft a DataQs letter for 393.24AL Carrier CSA lookup CSA glossary

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