All 45 exams / S-series / ASE S6 Electrical/Electronic Systems
S6
ASE S6 Electrical/Electronic Systems
School buses
What's on the S6 exam?
1
General Electrical/Electronic System Diagnosis
2
Low-Voltage Battery Diagnosis and Service
3
Starting System Diagnosis and Repair
4
Low-Voltage Charging System Diagnosis and Repair
5
Lighting Systems Diagnosis and Repair
6
Gauges and Instrument Warning Devices Diagnosis and Repair
7
Miscellaneous
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.
S6 quick reference S-series
Categoryrepair technician
Work experience2
Question count55
Time allowed90 minutes
Fee$62
Recert cycle5 years
Recert pathRetest (23-question, 45-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.
Track this one
Already hold S6? Add it to your recert tracker.
Enter the date you earned S6 and the tracker flags exactly when it's due, and whether you're still inside the Renewal App credit window instead of a full retest.
Open the recert trackerCompare this test against the rest of the family in the full certification matrix, or use the which-test wizard to see if it fits your role.