Violation code

392.2DH

Headlamps - Failing to dim when required

Unsafe Driving3Non-OOS· SMS Appendix A v3.20

392.2DH is a Misc Violations violation under 49 CFR §392.2DH. It falls in the Unsafe Driving BASIC with a severity weight of 3/10. Nationally it was cited 452 times in the last five years, with an OOS rate of 0.0%.

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National roadside inspection stats

as of 6/20/2026

Inspections

452

that found this code

Violations

452

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.

Violation group: Misc Violations
Regulation §: 392.2DH
Severity weight: 3
Used in SMS: Yes
Status: Active
Updated: 6/20/2026

Last updated June 2026

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Notes

DSMS: Y

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Challenging 392.2DH through FMCSA DataQs

If this violation was written incorrectly, here are the angles trucking-safety managers use to contest it. Playbook: Unsafe Driving.

Relevant 49 CFR49 CFR § 392.2

Applicable operating rules

“Every commercial motor vehicle must be operated in accordance with the laws, ordinances, and regulations of the jurisdiction in which it is being operated. However, if a regulation of the Federal Motor Carrier Safety Administration imposes a higher standard of care than that law, ordinance, or regulation, the FMCSA regulation must be complied with.”

Common ways to challenge this code

Radar / lidar / scale calibration not produced
The state instrument used to measure speed or weight had no current calibration certificate, or one was never provided when requested.
Evidence that wins
- ✓FOIA / public-records request response from the citing agency
- ✓Calibration log expiration date if produced
- ✓Driver's contemporaneous note (e.g., independent dashcam speed)
Citation based on visual estimate only
The inspection report indicates the officer estimated speed visually rather than using a calibrated instrument.
Evidence that wins
- ✓Inspection report narrative copy showing "visual estimate" wording
- ✓Officer training records or pacing distance, if obtainable
Underlying citation adjudicated
The underlying state court adjudicated the citation as dismissed, reduced, or amended.
Evidence that wins
- ✓Certified court disposition with case number and date
- ✓Original citation copy

Common pitfalls — avoid these

⚠Submitting an uncertified court printout — DataQs requires the clerk-stamped version
⚠Forgetting that "guilty of a lesser charge" still counts as conviction — the violation may stay, just at reduced severity

⚡ Draft a challenge for 392.2DH →Read the DataQs guide first

More codes in Unsafe Driving

Same BASIC category — ranked by national citation volume

View all Unsafe Driving codes →

Other Misc Violations codes

Codes under the same FMCSA violation group

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Frequently asked questions about 392.2DH

What does violation 392.2DH mean?

392.2DH is the FMCSA roadside-inspection violation code for "Headlamps - Failing to dim when required", part of the Misc Violations group, cited under 49 CFR §392.2DH.

What BASIC does 392.2DH affect?

392.2DH falls under the Unsafe Driving BASIC in the FMCSA Safety Measurement System (SMS).

What is the CSA severity weight of 392.2DH?

392.2DH carries a severity weight of 3 out of 10. Higher weights indicate violations more closely tied to crash risk, and they count more toward a carrier's Unsafe Driving score.

Is 392.2DH an out-of-service (OOS) violation?

No. 392.2DH 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 392.2DH add to a carrier's score?

The point contribution of 392.2DH depends on its severity weight (3/10) multiplied by a time weight of 3, 2, or 1 based on how recent the inspection is. You can calculate the exact contribution with the CSA points calculator.

Can 392.2DH be challenged through DataQs?

Yes. If you believe 392.2DH 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 392.2DH Unsafe Driving BASIC Carrier CSA lookup CSA glossary