Violation code

393.3A1-TARPSWST

Tires - Presence of rubber-coated cord or cured rubber plug in the sidewall of a single tire.

Vehicle Maintenance8Non-OOS· SMS Appendix A v3.20

393.3A1-TARPSWST is a Tires violation under 49 CFR §393.3A1-TARPSWST. It falls in the Vehicle Maintenance BASIC with a severity weight of 8/10. Nationally it was cited 21 times in the last five years, with an OOS rate of 85.7%.

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National roadside inspection stats

as of 6/20/2026

Inspections

that found this code

Violations

total written

OOS rate

85.7%

18 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 §: 393.3A1-TARPSWST
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 3.20 | Footnote: This violation was added to SMS with the July 25, 2025 snapshot.

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Challenging 393.3A1-TARPSWST through FMCSA DataQs

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

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

⚡ Draft a challenge for 393.3A1-TARPSWST →Read the DataQs guide first

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Frequently asked questions about 393.3A1-TARPSWST

What does violation 393.3A1-TARPSWST mean?

393.3A1-TARPSWST is the FMCSA roadside-inspection violation code for "Tires - Presence of rubber-coated cord or cured rubber plug in the sidewall of a single tire.", part of the Tires group, cited under 49 CFR §393.3A1-TARPSWST.

What BASIC does 393.3A1-TARPSWST affect?

393.3A1-TARPSWST falls under the Vehicle Maintenance BASIC in the FMCSA Safety Measurement System (SMS).

What is the CSA severity weight of 393.3A1-TARPSWST?

393.3A1-TARPSWST 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 393.3A1-TARPSWST an out-of-service (OOS) violation?

No. 393.3A1-TARPSWST 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 393.3A1-TARPSWST add to a carrier's score?

The point contribution of 393.3A1-TARPSWST 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 393.3A1-TARPSWST be challenged through DataQs?

Yes. If you believe 393.3A1-TARPSWST 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 393.3A1-TARPSWST Vehicle Maintenance BASIC Carrier CSA lookup CSA glossary