ASE Certification: Series, Testing, Master Technician, Renewal

ASE certification is a voluntary credential from the National Institute for Automotive Service Excellence that lets automotive technicians prove their skills through standardized, subject-specific exams. The nonprofit has run the program since 1972, and its more than 50 tests cover work from routine maintenance to hybrid diagnostics and collision repair.¹ Each certification you earn lasts five years, after which you recertify to keep it active.

Which Certification Fits Your Work

ASE groups its exams into series, and the right one depends on what you actually turn wrenches on. You do not have to pick a whole series at once; every test stands on its own, and passing one earns you a certification in that subject.

A Series: Cars and Light Trucks

The A series is the most common path. It covers passenger cars, SUVs, and light-duty trucks up to Class 3, with nine individual tests spanning engine repair, transmissions, drivetrain, suspension and steering, brakes, electrical systems, HVAC, engine performance, and light vehicle diesel engines.²

B Series: Collision Repair and Refinish

The B series validates body repair, painting, and structural work. Tests B2 through B5 form the core track, with a separate B6 exam for damage analysis and estimation.²

T Series: Medium and Heavy Truck

Technicians on commercial trucks and buses take the T series, which runs from T1 (gasoline engines) through T8 (preventive maintenance inspection).³

G1: Maintenance and Light Repair

The G1 is the entry-level option. It targets technicians doing routine maintenance rather than complex diagnostics, and it needs only one year of hands-on experience instead of the two years most other tracks demand.⁴ If you are early in your career, this is a practical credential to earn before taking on the full A series.

L Series: Advanced Specialist

The L series sits above the standard tracks. It has four designations: L1 for advanced engine performance, L2 for electronic diesel engine diagnosis, L3 for light-duty hybrid and electric vehicles, and L4 for advanced driver assistance systems. These require three years of documented experience, and some have prerequisites: L1, for example, requires you to have passed A8 (engine performance) before you can even register.⁵ During the L1, L2, and L4 exams, a searchable “Composite Vehicle” reference document appears on screen.

ASE also offers exams for transit bus technicians, parts specialists, service consultants, compressed natural gas vehicles, and exhaust systems. All follow the same testing and renewal structure.

Experience You Need Before You Can Be Certified

Passing the test alone does not earn you the credential. ASE requires documented, hands-on work experience:

Two years for most A-series, B-series, and specialty tests⁶
One year for G1 Maintenance and Light Repair⁴
Three years for the L-series advanced specialist tests⁷

Formal training can substitute for part of it. Graduates of ASE Education Foundation-accredited programs can typically count their schooling as one year toward the standard two-year requirement.⁶ For the G1 and L-series tests, up to half the requirement can come from vocational training. The exact credit depends on program length and accreditation.

You document your history on the official Work Experience Form through the ASE website, listing the vehicles you have worked on and the systems you have serviced.⁸ ASE reviews this before issuing the credential after you pass, so keep records of your shop hours and any training certificates.

Registering, Paying, and Taking the Test

Registration runs in four quarterly windows: January–March, April–June, July–September, and October–December.⁹ You sign up through the MyASE portal, which becomes the permanent home for your certification history.

The cost has two parts. A $34 registration fee is paid once per order, and each standard test is $62. Advanced-level L-series tests are $124 each.¹⁰ Scheduling multiple tests in the same window means you pay the registration fee only once.

After paying, you receive an eligibility code to book your appointment at a Prometric testing center. Bring a valid government-issued photo ID; without it, you will not be admitted. Personal devices, notes, and reference materials are prohibited.

Exams are multiple-choice, with question counts and time limits that vary by test. A-series exams typically run 50 to 60 questions in 60 to 90 minutes, and every exam includes 10 unscored research questions mixed in with the scored ones. You cannot tell which is which, so answer all of them.¹¹ Questions are built around real diagnostic and repair scenarios rather than textbook recall. ASE does not publish a fixed passing score; each exam uses a psychometrically determined cut score, and you usually get your result before leaving the testing center.

If You Fail

You must wait at least 30 full days before purchasing and scheduling the same test again.¹² You pay the full test fee on every attempt. There is no cap on retakes, but the waiting period and per-attempt cost stack up fast, so use your score report to work on weak areas before rescheduling.

Reaching Master Technician

Master Technician is the highest general recognition inside a series. The requirements depend on the track:

Master Automobile Technician: pass A1 through A8. A9 is not required.²
Master Collision Repair Technician: pass B2 through B5. B6 is not required.²
Master Medium/Heavy Truck Technician: pass T2 through T8. T1 is not required.³

You can build toward Master status across multiple testing windows. But every underlying certification has to stay active at the same time. Each one expires five years after you earned it, and because you passed them on different dates, those clocks do not sync. If your A3 lapses while the other seven are current, you lose the Master designation until you recertify in A3. Staggered expiration dates are the single most common way technicians lose Master status, so calendar reminders for each individual cert are worth the few minutes it takes to set them.

Keeping Your Certification Current

Every ASE certification expires five years after you earn it. You renew by taking a recertification exam in the same subject. These are much shorter than the initial tests: where an A-series exam might have 60 questions, its recertification version has roughly 25, and the questions focus on updates in technology and industry standards rather than retesting foundational knowledge.¹³

If you let a certification lapse, you can still take the shorter recertification exam instead of starting over with the full-length version, as long as you were previously certified in that area.¹² Your credential does show as expired during the gap, though, so anyone verifying it will see the lapse.

The Renewal App for A-Series

For A-series certifications only, ASE offers a mobile alternative to the traditional recertification exam. The ASE Renewal App lets you answer questions throughout the year on a phone, tablet, or computer and extend your expiration date without visiting a test center.¹⁴ It runs $52 per year regardless of how many A-series certifications you hold.¹⁵ The app covers A1 through A9 only. B-series, T-series, and L-series credentials still renew through traditional testing at a Prometric center.

GI Bill Reimbursement for Veterans

Veterans and eligible dependents can have ASE exam costs reimbursed through the GI Bill. The VA covers test fees up to $2,000 per exam, which more than covers any ASE test and its registration fee. Eligible programs include the Post-9/11 GI Bill (Chapter 33), Montgomery GI Bill Active Duty (Chapter 30), Montgomery GI Bill Selected Reserve (Chapter 1606), and Survivors’ and Dependents’ Educational Assistance (Chapter 35).¹⁶

To claim reimbursement, submit VA Form 22-0803 with your testing receipt and results. The VA will also reimburse retakes and recertification exams as long as you have remaining entitlement and are within your benefit time limit. Separate reimbursement for prep courses is available through VA Form 22-10272 for those using the Post-9/11 GI Bill or Chapter 35 benefits.¹⁶

1
National Institute for Automotive Service Excellence. About ASE
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Automotive Service Excellence. ASE Test Series
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National Institute for Automotive Service Excellence. ASE Medium/Heavy Truck Study Guide 2026
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National Institute for Automotive Service Excellence. ASE Auto Maintenance and Light Repair Study Guide
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National Institute for Automotive Service Excellence. Advanced Engine Performance Specialist (L1) Test
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Automotive Service Excellence. Work Experience Requirements for ASE Certification
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National Institute for Automotive Service Excellence. ASE Certification – Need to Know
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National Institute for Automotive Service Excellence. Download Forms
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Automotive Service Excellence. Register Now
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Automotive Service Excellence. Dates, Fees and Test Times
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National Institute for Automotive Service Excellence. ASE Automobile Tests
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Automotive Service Excellence. Frequently Asked Questions
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National Institute for Automotive Service Excellence. ASE Automobile Tests
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ASE. ASE Renewal FAQs
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Automotive Service Excellence. ASE Renewal Landing
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U.S. Department of Veterans Affairs. Licensing and Certification Tests and Prep Courses