Medium/Heavy Truck T1–T8 · exam facts
ASE truck and diesel certification requirements
To hold an ASE medium/heavy truck certification, T2 diesel engines included, you pass the test and document 2 years of full-time hands-on work. The order is flexible: you can test first; the certificate waits until the experience is approved. Every rule below links to the page or guide it comes from, checked Oct 23, 2026.
- 2 yearshands-on work
- Test center onlyfor a first attempt
- 30 daysbefore a retake
- 5 yearsthen recertify
Every rule in one table
| Fact | Detail | Source | Checked |
|---|---|---|---|
| Work experience required | 2 years of full-time hands-on work (or the part-time equivalent)you can test first; the certificate waits until the experience is approved | ASE: work experience requirements · ASE Certification: Need to Know (Jan 2026) | |
| Where you take it | First attempt at a Prometric test center only; remote testing is for recertification | ASE Certification: Need to Know (Jan 2026) | |
| Offered in | United States, U.S. territories and Canada; some overseas military bases | ASE: FAQs | |
| Time to take the test | 90 days from purchase to schedule and take the test; no changes within 3 days of the appointmentuntaken, unexpired tests canceled within 90 days of purchase are refunded | ASE: test fees and registration (2026) | |
| Registration windows | 2026: Jan 10–Mar 31 · Apr 10–Jun 30 · Jul 10–Sep 30 · Oct 10–Dec 31 | ASE: test fees and registration (2026) | |
| Passing score | Not published by ASEASE releases neither a cut score nor the questions you missed | ASE: FAQs · ASE Certification: Need to Know (Jan 2026) | |
| Results | Score report emailed when you finish the testmyASE shows results later: within 24 hours in most cases (FAQ); the Need to Know guide says within 5 days | ASE: FAQs · ASE Certification: Need to Know (Jan 2026) | |
| Retake wait | 30 full days before you can buy and schedule the same test again | ASE: FAQs | |
| Certification valid for | 5 years, then a recertification testa recertification resets the expiry to five years from the recert date | ASE: FAQs | |
| Recertification test | 20 to 28 questions per recertification test, 30 or 45 minutes | ASE Medium/Heavy Truck Study Guide 2026 · ASE: T1–T8 tests page | |
| Ways to recertify | Test center or remote proctoring (Prometric ProProctor); no Renewal App | ASE Certification: Need to Know (Jan 2026) | |
| ASE Renewal App | Not available: the ASE Renewal App covers A1–A9 only | ASE Certification: Need to Know (Jan 2026) · ASE: Renewal App | |
| Language | English, with a pop-up English–Spanish glossary; no side-by-side Spanish version | ASE Medium/Heavy Truck Study Guide 2026 · ASE Certification: Need to Know (Jan 2026) | |
| Master status | T2–T8 make Master Medium-Heavy Truck Technician; T1 is not requiredeach certification must stay current to keep Master status | ASE: T1–T8 tests page · ASE Medium/Heavy Truck Study Guide 2026 |
Work experience
Training can replace part of the 2 years, or all of it: An ASE-accredited program counts as 1 year, an OEM co-op program up to 2 years, 3+ ASE entry-level tests as 1 year, other training up to 1 year; substitutes cannot be combined. You claim a substitute on the work experience form.
Test format
Each T test has 40–55 scored questions and 60–90 min of testing time, depending on the test. Another 10 are unscored research items, mixed in without a mark.
The overview has the table for each test, and each test page lists its content areas, for example T4 Brakes.
Registration and scheduling
Tests are sold in four registration windows a year; the current one: Oct 10–Dec 31 (fall 2026). Once you buy, you have 90 days to schedule and sit each test. Refunds: untaken, unexpired tests canceled within 90 days of purchase are refunded.
Where you test
A first attempt is taken at a Prometric test center in the US and Canada. Remote proctoring opens up only for recertification.
Scoring and results
The passing score is not published, and the report does not list the questions you missed. The pass marks that circulate online, "70%" or "50–60%", come from ASE's entry-level student tests, not from the professional T tests.
Your score report is emailed at once, and the copy in myASE follows later; the table above gives both timings ASE publishes.
Retakes
Wait 30 days, then buy the test again: as of October 2026 that is $96 on its own, or $62 added to a larger order.
Recertification
Each T certification runs 5 years; a recertification resets the expiry to five years from the recert date.
- Recert test: shorter, 20–28 questions depending on the test.
- Where: center or remote, through Prometric ProProctor for remote.
- Renewal App: not for T tests.
- Fee, as of October 2026: $62 per recertification test; test fees are capped at $186 an order, so $220 at most with registration. The cost page works out the Master truck case.
Language
The T tests are in English with a pop-up English–Spanish glossary for terms; there is no side-by-side Spanish version.
More on the T-series
- ASE T-Series The eight medium/heavy truck tests: format, content, the T2–T8 Master path
- ASE T-Series practice test Questions from all eight truck tests, filter by test, every option explained
- ASE T-Series cost One test, the seven Master tests in one order, retakes and the recertification cap
- ASE T-Series study guide The free official guide, where the scored questions sit, key federal rules
T-series requirements, quick answers
What are the requirements for ASE diesel certification on trucks?
Pass T2 Diesel Engines and document 2 years of hands-on work. Training can replace some or all of it; see work experience.
What is the passing score for the ASE T tests?
It is not published: ASE releases neither a cut score nor the questions you missed. The result is pass or fail.
How long does an ASE truck certification last?
5 years. The Renewal App is not for T tests, so every T test is renewed by a recertification test.
How soon can I retake a T test?
After 30 days, counted in full days, you can buy and schedule the same test again.