Violation code

393.75A3-TAOL

Tires - All others, leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS

Vehicle Maintenance8Non-OOS· SMS Appendix A v3.20

393.75A3-TAOL is a Tires violation under 49 CFR §393.75A3-TAOL. It falls in the Vehicle Maintenance BASIC with a severity weight of 8/10. Nationally it was cited 215,584 times in the last five years, with an OOS rate of 98.3%.

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National roadside inspection stats

as of 6/20/2026

Inspections

192,854

that found this code

Violations

215,584

total written

OOS rate

98.3%

211,889 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: Tires
Regulation §: 393.75A3-TAOL
Severity weight: 8
Used in SMS: Yes
Status: Active
Updated: 6/20/2026

Last updated June 2026

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Notes

DSMS: Y | Comment: Added in 3.15; updated description in 3.19 | Footnote: As of February 1, 2023, the violations in this table are included in SMS. Only violations cited on or after February 1 are included in SMS calculations. This update aligns SMS with how violations are being cited in a new software used for roadside inspections. The description for this violation was updated in SMS with the September 27, 2024 snapshot.

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Challenging 393.75A3-TAOL through FMCSA DataQs

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

Relevant 49 CFR49 CFR § 393.75

Tires

“No motor vehicle shall be operated on any tire that has body ply or belt material exposed through the tread or sidewall, has any tread or sidewall separation, is flat or has an audible leak, or has a cut to the extent that the ply or belt material is exposed.”

Common ways to challenge this code

Tread measurement disputed
The tread depth measurement was taken at a worn point that is not representative, contrary to NHTSA/FMCSA measurement standards.
Evidence that wins
- ✓Independent tread gauge reading from same tire (multiple positions)
- ✓Photograph of the tire with a reference scale
Inflation context — recent stop or temperature
The under-inflation reading was taken immediately after a long-distance high-temperature run or before warm-up, not at the FMCSA standard measurement state.
Evidence that wins
- ✓Tire-pressure-monitoring system log (TPMS)
- ✓Service receipt showing inflation at start of trip

Common pitfalls — avoid these

⚠Inflation readings can't be challenged with a re-inflation done after the stop — must show original-state evidence

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Frequently asked questions about 393.75A3-TAOL

What does violation 393.75A3-TAOL mean?

393.75A3-TAOL is the FMCSA roadside-inspection violation code for "Tires - All others, leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS", part of the Tires group, cited under 49 CFR §393.75A3-TAOL.

What BASIC does 393.75A3-TAOL affect?

393.75A3-TAOL falls under the Vehicle Maintenance BASIC in the FMCSA Safety Measurement System (SMS).

What is the CSA severity weight of 393.75A3-TAOL?

393.75A3-TAOL carries a severity weight of 8 out of 10. Higher weights indicate violations more closely tied to crash risk, and they count more toward a carrier's Vehicle Maintenance score.

Is 393.75A3-TAOL an out-of-service (OOS) violation?

No. 393.75A3-TAOL 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 393.75A3-TAOL add to a carrier's score?

The point contribution of 393.75A3-TAOL depends on its severity weight (8/10) 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 393.75A3-TAOL be challenged through DataQs?

Yes. If you believe 393.75A3-TAOL 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 393.75A3-TAOL Vehicle Maintenance BASIC Carrier CSA lookup CSA glossary