Violation Code Deep-Dives
Reading 393.9A-LIL: The Identification Lamp Your Pre-Trip Skips
A dead identification lamp is cheap to fix and easy to overlook. Here is what the code covers, how the calculator scores it, and where drivers usually lose it.
The Lamp Nobody Checks: Reading 393.55(e)
Violation 393.55(e) is a missing or defective ABS malfunction indicator lamp on a trailer built after March 1, 1998. Here is what the inspector checks, why it costs points even without an out-of-service mark, and how to catch it before the roadside does.
Dead Headlights, Real Points: Reading Violation 393.9H
A burned-out headlamp looks like the cheapest fix on the inspection report. The scoring math is more deliberate than that.
392.2C Failure to Obey a Traffic Control Device: A Small Entry With a Long Tail
Violation 392.2C reads like a minor ticket, but it is scored under Unsafe Driving at full severity. Here is what the code covers, how it is weighted, and what actually causes it on the road.
Brakes That Look Fine and Still Fail: Reading 393.48(a)
Violation 393.48(a) covers brake function, not just brake parts. Here is what inspectors check, what our data shows, and how the citation feeds your score.
Brake Hose Chafing Under the Trailer: What 393.45B2UV Is Really Catching
The hose that gets written up is rarely the one a driver was looking at. Here is how chafing and kinking develop on air brake lines, what the regulation expects, and what the numbers say about this code.
396.5(b): The Drip You Think Is Nothing
A small oil or grease leak looks like housekeeping. The code treats it as a maintenance finding, and the way it is scored makes it worth fixing before the inspector sees it.
Windshield Violation 393.60(c): Why a Small Chip Costs More Than You Think
A chip the size of a pencil eraser rarely gets a truck pulled off the road. It still goes on the inspection report, and it still counts against your carrier. Here is how 393.60(c) works.
393.75(c): The 2/32 Tread Check, Measured Where It Counts
A tire can look legal from six feet away and still fail the one measurement inspectors take. Here is what 393.75(c) requires, where the gauge goes, and how the write-up feeds your score.
Slack Adjusters That Stop Adjusting: Reading 393.53(b) the Way an Inspector Does
393.53(b) is one sentence in the regulation, but it sits behind a lot of brake stroke measurements at the roadside. Here is what the rule protects, how automatic adjustment fails, and what to check before the inspector does.
Tire Pressure at 50% Capacity: Why Your Fleet Checks Miss This Until Inspection
393.75A3-TAOL has been cited over 250,000 times because tire pressure checks are often the first maintenance step fleets skip. Here's the mechanics of the threshold and how to keep it off your violations.
396.3(a)(1): Why Loose Bolts and Worn Parts Become Your Inspection Problem
This violation isn't about a single failure. It's about the systems you skip when you're routine-checked. Here's what inspectors actually look for when they cite 396.3(a)(1)—and how the numbers reveal what matters most.
Why Lighting and Reflective Violations Keep Stopping Trucks: Inside 393.11
Lighting and reflective material violations show up in over 256,000 inspection records. I'll walk you through what inspectors actually look for and why the maintenance gap behind this violation matters.
396.3A1BOS: Why a Severity Weight of Zero Doesn't Mean What You Think
A 20% brake defect threshold sounds technical until you understand it stops 99.7% of vehicles. Here's what the numbers actually tell you about brake maintenance and roadside enforcement.
What 392.2-SLLS2 Really Costs Your Safety Record
Speeding 6–10 mph over the limit is one of the most common safety violations on the road. We break down the mechanics, the actual risk profile, and why the severity weight of 4 matters for your fleet's future.
393.78: Why Your Wipers Matter More Than You Think
Over 316,000 wiper violations on record—but most are avoidable. Here's what the regulation actually requires and how to stop failing inspections on something this simple.
Why Your Stopped Vehicle Warning Devices Matter More Than You Think
Over 293,000 violations of 49 CFR 393.95(f) tell me most operators aren't thinking about emergency warning devices until they're stuck on the shoulder. Here's what actually works—and what fails in the field.
The Silent Threat: Why 393.75(a)(3) Tire Failures Matter More Than You Think
A flat tire or audible air leak means your truck is failing a basic maintenance requirement. Here's what violation 393.75(a)(3) actually covers—and why you need to catch these defects before an inspector does.
Why 352,000+ Turn Signal Violations Aren't Getting the Attention They Deserve
Turn signals fail quietly and drivers never notice. Here's what the inspection data shows, why it matters for your CSA score, and how to fix it.
When Your Fire Extinguisher Fails the Inspector: Understanding 393.95(a)
The fire extinguisher is one of the few emergency tools a driver controls. So why do inspectors cite this violation 374,029 times? Here's what the regulation requires and what actually gets missed in the field.
396.17C-PI: The Documentation Gap That Gets Written 379,000 Times a Year
Most drivers think they passed their pre-trip inspection. But FMCSA inspectors don't care what you think—they care what you wrote down. Here's why periodic inspection documentation is the easiest violation to avoid and the hardest to defend.
Proof of Periodic Inspection: Why 396.17(c) Gets Written So Often
Nearly 586,000 violations and counting. Most aren't about broken equipment—they're about missing paperwork in the cab. Here's what 396.17(c) actually requires, and how to stop getting cited for it.
The Brake Adjustment Problem: Why 393.47(e) Violations Keep Adding Up
Brake out of adjustment violations have been cited nearly 600,000 times. Here's what inspectors are actually looking for, why your SMS score takes the hit, and how to fix it operationally.
When a Lamp Failure Becomes a Bigger Problem: Understanding 393.9 Violations
Violation 393.9 is cited over 1.1 million times but rarely triggers out-of-service status by itself. Here's what the gap between citations and enforcement actually means for your fleet's maintenance discipline.