FMCSR 383.91A: No CDL Endorsement — Driver Q&A

Yes, almost certainly. Across 13 million inspections in our database, 383.91A results in an out-of-service placement 96.3% of the time. That's far above the all-FMCSR average of 31.4%. Of the 327 citations on record for this code, 315 led to immediate OOS. Inspectors treat this as a critical safety violation because you're operating a vehicle requiring a specific endorsement (hazmat, tanker, school bus, passenger, or double/triple) without the proper credential. Get compliant before your next inspection.

This violation carries a CSA severity weight of 8, which is moderately high on the FMCSA scale. Your actual CSA point total depends on the 30-day multiplier (you may see points doubled or tripled if you accumulate multiple violations in the same 30-day window). One citation alone will dock you 8 base points; a second citation within 30 days could multiply that impact. Check your carrier's safety score portal to see how this specific citation stacks against your other violations.

1. Understand your truck is out of service. You cannot legally operate it until compliant.
2. Get the proper endorsement immediately. Contact your state's DMV to apply for the required CDL endorsement (hazmat, tanker, school bus, passenger, or double/triple).
3. Contact your carrier's safety team. Notify dispatch and your safety manager within the hour.
4. Check for related citations. Our inspection data shows that 383.91A often co-occurs with operating without a CDL (383.23A2, 18 instances in the last 90 days) and fatigue violations (392.2RG, 17 instances). Review your full inspection report.
5. Don't operate again until endorsed. Any operation after this citation could result in fines and further enforcement action.

Yes, it's exceptionally serious. Our data shows 383.91A has a 96.3% out-of-service rate—higher than most peer violations in the Driver Fitness category. For comparison, operating without a valid CDL entirely (383.23A2-LCDLN) has a 98.6% OOS rate and 47,123 citations, making it slightly more common but similarly strict. Wrong CDL class (383.23(a)(2)) is cited far more often (50,385 times) but at a 98.4% OOS rate. The point: all "no endorsement" and "no CDL" violations are treated as critical stops. They rank #1060 out of 3,036 FMCSR codes by volume, but the enforcement is nearly absolute.

You can submit a DataQs (FMCSA's crash data quality) challenge, but success depends on the type of error. DataQs contests work best for documentation or administrative mistakes—for example, if you actually held the endorsement at the time but the inspector failed to verify it, or if your state's records show you were properly endorsed. If the inspector verified your license was genuinely missing the endorsement, the citation will stand. Consult with your carrier's safety or legal team to assess whether a documentation error occurred before filing a DataQs request.

In the last 180 days, Texas leads with 50 citations, followed by Illinois with 25, and North Carolina with 20. Texas shows a 98.0% out-of-service rate; North Carolina hits 100%. If you operate in these states, the enforcement is particularly consistent and strict. Illinois has the lowest OOS rate of the three at 92.0%, but that's still well above the national average, meaning the violation is treated as an automatic stop across all major enforcement regions.

Immediate. Your truck is out of service, and you cannot legally operate until you have the required endorsement. Over the last 90 days, our records show 46 citations for this violation—consistent enforcement month to month (ranging from 13 to 24 citations per month in the past year). Every month you delay, you risk a second citation and cumulative CSA penalty. Visit your state DMV immediately to apply for the endorsement (hazmat, tanker, school bus, passenger, or double/triple). Once issued, you can return to service.

This violation impacts both. It appears on your individual driver record and counts against your carrier's Safety Management System (SMS) score under the Vehicle Maintenance and Driver Fitness BASIC categories. Even if you move to a new carrier, the citation stays on your record for the FMCSA's CSA reporting period, affecting your insurability and hiring prospects. Your current carrier's safety profile also takes a hit. Addressing this quickly—by getting properly endorsed—prevents compounding damage to both your career and your company's compliance ratings.