Take a closer look at ASE-certified professionals and their specialties.

Across the country, there are hundreds of thousands of auto professionals who are ASE certified in dozens of specialty areas, including many professionals who are certified in multiple areas. The numbers of professionals currently certified by ASE are shown below (with information accurate through the Spring 2020 ASE test administration). This list is updated once a year in July.

Please note in addition, there are 57,181 students who hold current ASE Entry Level certification.

Automobile Technicians 173,213
Service Consultants 15,398
Maintenance/Light Repair Technicians 21,185
Advanced Engine Performance Specialists 30,319
Collision Repair/Refinish Technicians 12,033
Collision Damage Estimators 4,281
Medium/Heavy Truck Technicians 30,496
Truck Equipment Installation & Repair Technicians 2,390
Compressed Natural Gas Technicians 1,391
Transit Bus Technicians 3,413
School Bus Technicians 4,187
Parts Specialists 19,377
Net Total Service Professionals 231,186
Note:  “Net Total” means individuals with multiple certifications are counted only once.  
Master Automobile Technicians 63,618
Master Collision Repair/Refinish Technicians 2,950
Master Medium/Heavy Truck Technicians 9,726
Master Medium/Heavy Vehicle Technicians 1,101
Master Truck Equipment Technicians 1,049
Master Transit Bus Technicians 927
Master School Bus Technicians 1,465
Automobile Series  
A1: Engine Repair 104,421
A2: Automatic Transmission Transaxle 78,197
A3: Manual Drive Train and Axles 85,566
A4: Suspension and Steering 126,002
A5: Brakes 134,521
A6: Electrical/Electronic Systems 110,690
A7: Heating and Air Conditioning 99,800
A8: Engine Performance 98,103
A9: Light Vehicle Diesel Engines 17,196
Maintenance/Light Repair Series  
G1: Auto Maintenance and Light Repair 21,185
Medium/Heavy Truck Series  
T1: Gasoline Engines 8,806
T2: Diesel Engines 18,453
T3: Drive Train 14,880
T4: Brakes 20,574
T5: Suspension and Steering 15,897
T6: Electrical/Electronic Systems 16,979
T7: Heating, Ventilation & A/C 15,391
T8: Preventive Maintenance Inspection 17,963
Truck Equipment Installation and Repair Series  
E1: Truck Equipment Installation and Repair Specialist 1,692
E2: Electrical/Electronic Systems Installation and Repair 1,629
E3: Auxilary Power Systems Installation and Repair 1,540
Collision Repair and Refinish Series  
B2: Painting and Refinishing 6,827
B3: Non-Structural Analysis and Damage Repair 5,766
B4: Structural Analysis and Damage Repair 5,123
B5: Mechanical and Electrical Components 7,069
Damage Analysis and Estimating  
B6: Damage Analysis and Estimating 4,281
Alternate Fuels Series  
F1: Compressed Natural Gas Vehicle 1,391
Advanced Level Series  
L1: Automobile Advanced Engine Performance Specialist 30,319
L2: Medium/Heavy Vehicle Electronic Diesel Engine Diagnosis Specialist 3,771
L3: Light Duty Hybrid/Electric Vehicle Specialist 1,540
Transit Bus Series  
H1: Compressed Natural Gas (CNG) Engines 699
H2: Diesel Engines 1,636
H3: Drive Train 1,579
H4: Brakes 2,257
H5: Suspension & Steering 1,791
H6: Electrical/Electronic Systems 1,593
H7: Heating, Ventilation & A/C 1,583
H8: Preventive Maintenance and Inspection 1,857
School Bus Series  
S1: Body Systems and Special Equipment 2,443
S2: Diesel Engines 2,156
S3: Drive Train 2,152
S4: Brakes 3,202
S5: Suspension and Steering 2,258
S6: Electrical/Electronic Systems 2,180
S7: Air Conditioning System and Controls 1,215
Service Consultant Series  
C1: Automobile Service Consultant 15,398
Specialty Tests  
X1: Exhaust Systems 5,375
Parts Specialist Series  
P1: Medium/Heavy Truck Parts Specialist 1,347
P2: Automobile Parts Specialist 17,942
P4: General Motors Parts Consultant 1,068