391.11B4-DEN: Driver Operating Without Proper Endorsements

Yes—almost certainly. Across our 13 million inspection records, 391.11B4-DEN resulted in an out-of-service order in 98.0% of cases (1,413 out of 1,442 all-time citations). This is far higher than the 31.4% national average OOS rate across all FMCSR codes. When an inspector finds you operating a CMV without the proper endorsements or in violation of endorsement restrictions, the truck is typically placed out of service immediately, and you cannot operate it until the violation is corrected and verified.

First: stop operating the vehicle. Do not drive it further—it will be out of service. Second: identify your missing or violated endorsement (hazmat, double/triple trailers, passenger, etc.) and confirm what your CDL actually permits. Third: contact your carrier's safety or compliance team immediately; our data shows 391.11B4-DEN often appears alongside CDL violations (383.23A2, 11 co-occurrences in the last 90 days) and fatigue violations (392.2RG, 10 co-occurrences). Fourth: request written documentation of the citation and the specific endorsement requirement you violated. Fifth: schedule a meeting with your state's driver licensing agency to verify or update your CDL if needed.

Yes, it ranks among the most serious. While 391.11B4-DEN ranks #622 nationally by citation volume (1,442 all-time), its 98.0% OOS rate is comparable to peer codes like CDL wrong class (383.23(a)(2), 98.4% OOS) and operating without a valid CDL (383.23A2-LCDLN, 98.6% OOS). These are all mandatory out-of-service findings. By contrast, general medical qualification violations (391.41(a)) have only a 16.2% OOS rate. The difference: endorsement and CDL violations are documentary—you either have the right license or you don't—whereas medical findings sometimes involve borderline medical situations.

Our inspection records show the highest concentration in three states over the last 180 days: New Mexico (118 citations, 100.0% OOS rate), Iowa (49 citations, 100.0% OOS rate), and North Carolina (46 citations, 100.0% OOS rate). Illinois follows with 31 citations and a 93.5% OOS rate. If you operate in the Southwest, Great Plains, or Southeast, be particularly vigilant about verifying your endorsements match your assigned routes and cargo.

The citation itself becomes a violation on your FMCSA CSA profile and contributes to the Driver Fitness BASIC category, which affects both your personal record and your carrier's. However, the specific point value depends on your state's enforcement philosophy and the FMCSA severity weight assigned—neither of which we can determine from inspection data alone. What we can tell you: in the last 12 months, 654 citations for 391.11B4-DEN were issued nationally, with a sharp spike in May 2025 (81 citations). You should contact your carrier's safety department or your state's licensing agency for the exact CSA point impact.

Yes, you can file a DataQs challenge if you believe the citation was issued in error or if you've since corrected the violation. However, 391.11B4-DEN is a documentary violation—inspectors confirm whether you have the proper endorsement by reviewing your CDL. If your license does show the required endorsement and the citation was issued anyway, that's a clear error. If your license truly lacked the endorsement at the time of the citation, the citation is valid even if you've since added it. File a DataQs request within 90 days through FMCSA's online portal, include a copy of your corrected or valid CDL, and explain the discrepancy clearly.

Extremely urgent. Your truck will be out of service—you cannot legally operate it until the violation is corrected. Our data shows 118 citations in the last 90 days alone, with May 2025 seeing the highest monthly volume (81 citations), indicating this remains a consistent enforcement focus. You must obtain the missing endorsement through your state's driver licensing agency before the vehicle can be returned to service. This typically requires passing a written test and sometimes a skills test, which can take days to weeks depending on state scheduling. Contact your DMV or licensing authority the same day you're cited.

Freightliners dominate the vehicle list, accounting for 450 all-time citations—nearly 31% of all 391.11B4-DEN violations we've recorded. Kenworth (164), Utility (160), Volvo (146), and International (137) follow. At the carrier level, Federal Express Corporation leads with 21 citations, followed by Swift Transportation Co of Arizona LLC and Forza Transportation Services Inc (5 citations each). This suggests hazmat and intermodal carriers, which require additional endorsements, are cited more frequently. If you drive specialty freight, your risk is proportionally higher.