All 45 exams / S-series / ASE S3 Drive Train
S3
ASE S3 Drive Train
School buses
What's on the S3 exam?
1
Automatic Transmission Diagnosis and Repair
2
Drive Shaft and Universal Joint Diagnosis and Repair
3
Drive Axle Diagnosis and Repair
Content-area outline only, authored from ASE's public task-list structure. No test question, answer, or diagnostic scenario is reproduced from ASE or any prep publisher.
S3 quick reference S-series
Categoryrepair technician
Work experience2
Question count50
Time allowed60 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (20-question, 30-minute recert version) every 5 years, or the ASE Renewal App.
Source: https://ase.com/wp-content/uploads/ASE_SchoolBus_Study_Guide.pdf.
Checked 2026-07-30.
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