Of all the maintenance related CSA violations that you could encounter in a roadside inspection, there are some that are more likely to result in an OOS (Out-of-Service) designation than others. Out-of-Service violations carry an extra 2 point penalty that is applied to the Violation Severity Weight of each violation. Understanding what violations are most common, and how to prevent them, can result in a safer fleet, less OOS related costs, and better overall CSA scores.

Listed below are what we’ve found to be the top 15 most common violations associated with an OOS designation. These violations may or may not represent the primary cause for an out-of-service designation, but are most commonly associated with one. In the table, you will find the violation code (linked to the e-CFR), description, and severity weight.

Violations Description Weight OOS
393.75(a) Flat tire or fabric exposed 8 +2
393.75(a)(3) Tire — flat and/or audible air leak 8 +2
393.75(a)(2) Tire — tread and/or sidewall separation 8 +2
393.75(c) Tire — other tread depth less than 2/32 of inch 8 +2
393.25(f) Stop lamp violations 6 +2
393.9TS Inoperative turn signal 6 +2
393.9T Inoperative tail lamp 6 +2
393.209(d) Steering system components worn, welded, or missing 6 +2
393.45 Brake tubing and hose adequacy 4 +2
393.45(b)(2) Failing to secure brake hose/tubing against mechanical damage 4 +2
393.48(a) Inoperative/defective brakes 4 +2
396.3A1BL Brake system pressure loss 4 +2
393.45B2PC Brake Hose or Tubing Chafing and/or Kinking – Connection to Power Unit 4 +2
393.9 Inoperative required lamps 2 +2
396.3(a)(1) Inspection/repair and maintenance parts and accessories 2 +2


Patterns & Trends

The violations listed above can easily be grouped into 3 distinct categories. Tires, Lamps, and Brakes. All of which are surely major components of most preventive maintenance inspection programs and pre-trip/post-trip driver inspections. It is important to note that maintenance shops, as well as drivers, are responsible for ensuring that equipment is compliant before it is placed into operation.


Inspection – More thorough inspection by maintenance personnel and drivers is the single most effective way to improve compliance. It is fair to say that some issues do occur during operation, after a piece of equipment is properly deemed compliant, but this is likely the exception rather than the rule. Spending a little more time to identify issues is easily justified when compared to the costs of being placed out-of-service.

Action – Simply identifying an issue is only half of the solution. Drivers and maintenance personnel must work together to ensure that proper action is taken to return equipment to compliance. Passing the buck won’t do either party any favors.

Sharp HES

If your fleet is not receiving adequate attention due to logistics challenges, personnel shortages, or other issues, contact Sharp HES today to see how we can help implement an on-site PM plan to increase up-time and compliance.