The patrol released the results of the Motor Vehicle Inspection Division's 2014 annual school bus inspection program.
Nearly 12,000 school buses were inspected between Feb. 3 and May 20 of this year.
More than 84 percent, or 10,161 buses, passed inspection.
The report also showed 1,431 buses were rated as rejected and 405 buses were taken out of service.
Buses rated as rejected may continue to operate until repairs are made.
School districts are allowed 20 days following initial inspection to repair identified defects before being reinspected.
Buses placed out-of-service must be repaired, reinspected and placed back into service by the patrol before it can be used to transport students.