The 310S Automotive Service Technician Red Seal exam has 125 multiple-choice questions, each with four options and one correct answer. You get four hours, and the pass mark is 70%, which is 88 correct answers. The questions are spread over eight blocks, one for each major work activity in the 2023 Red Seal Occupational Standard: common occupational skills (9 questions), engine and engine support systems (22), vehicle module communications systems (12), driveline systems (17), electrical and comfort control systems (23), steering, suspension, braking, tires and wheel bearings (23), restraint systems, body, accessories and trim (10), and hybrid and electric vehicle systems (9). Three blocks, B, E and F, hold 68 of the 125 questions. Only 5 to 15% of the questions are straight recall. The rest are split between procedural questions (40 to 50%) and critical thinking questions (40 to 50%), so most of the exam asks you to follow a procedure or reason from a symptom to a cause.
01What is the 310S Automotive Service Technician Red Seal exam?
It is the national certification exam for the automotive service technician trade. The Red Seal Program's exam preparation guide calls the Red Seal exam the "final exam" for tradespeople: every province and territory uses it to issue the Red Seal endorsement, and most use it to issue trade certification as well.
The name is the same on both sides. "Automotive Service Technician" is the trade's official Red Seal title and also the name Ontario uses, and 310S is Ontario's trade code for it. The "310S exam" and the Automotive Service Technician Red Seal exam are the same exam.
The content is national. According to the exam preparation guide, tradespeople from across Canada decide what goes in the occupational standard, write and review every exam question, and decide how many questions each section gets. The exam is then administered by the apprenticeship and certification authority in each province and territory. In Ontario that is Skilled Trades Ontario.
The format is fixed:
- 125 questions, all multiple choice.
- Four options per question (A to D), one correct answer, one mark per question. The guide says there are no trick questions.
- Four hours of writing time. That is 240 minutes for 125 questions, or about 1.9 minutes per question.
- A pass mark of 70%. On 125 questions that means at least 88 correct. There is no penalty for a wrong answer, so answer every question.
02What is on the 310S exam?
The exam follows the 2023 Red Seal Occupational Standard (RSOS) for the trade, which divides the work into eight major work activities. Each one is a block on the exam, and the Red Seal Program publishes how many questions each block gets.
| Block | Major work activity | Questions | Share of exam |
|---|---|---|---|
| A | Common occupational skills | 9 | 7.2% |
| B | Engine and engine support systems | 22 | 17.6% |
| C | Vehicle module communications systems | 12 | 9.6% |
| D | Driveline systems | 17 | 13.6% |
| E | Electrical and comfort control systems | 23 | 18.4% |
| F | Steering, suspension, braking, control systems, tires, hubs and wheel bearings | 23 | 18.4% |
| G | Restraint systems, body, accessories and trim | 10 | 8.0% |
| H | Hybrid and electric vehicle systems | 9 | 7.2% |
| Total | 125 | 100.0% |
Two blocks tie for heaviest: electrical and comfort control systems (E) and steering, suspension, braking, tires and wheel bearings (F), at 23 questions each. Engine and engine support systems (B) is one question behind at 22. The lightest blocks are common occupational skills (A) and hybrid and electric vehicle systems (H), at 9 questions each. The shares above are computed from the question counts. The standard prints rounded national weightings for the same blocks (7, 17, 10, 14, 18, 19, 8 and 7%), and those put Block F ahead of Block E even though the exam gives both 23 questions. Go by the question counts on the exam information page: they are the breakdown of the exam itself, while the weightings in the standard are the national averages it was built from.
03What does each block cover?
The standard lists 23 tasks under the eight blocks. From Block B onward the pattern is the same every time: a task for diagnosing a system and a matching task for repairing it. The percentages below are the task weightings the standard gives inside each block.
The short block names in the table are ours. Under each heading below is the title the Red Seal Program prints on its exam information page, so you can match the two.
Block A: Common occupational skills (9 questions)
Official title: Performs Common Occupational Skills
Three tasks. Performs safety-related functions (42% of the block) covers keeping a safe work environment, using personal protective equipment and safety equipment, and the specific safety protocols for hybrid and electric vehicles. Uses tools, equipment and documentation (50%) covers tools, fasteners, tubing, hoses and fittings, hoisting and lifting equipment, electronic service tools for diagnostics and programming, and technical information. Uses communication and mentoring techniques (8%) is the smallest task in the block, and the Red Seal Program's published breakdown assigns it no questions at all on this exam.
Block B: Engine and engine support systems (22 questions)
Official title: Diagnoses and repairs engine and engine support systems
Six tasks, the most of any block. Diagnoses engine systems (19%) and Repairs engine systems (16%) cover cooling systems, lubricating systems, the engine assembly and accessory drive systems. Diagnoses gasoline engine support systems (21%) and Repairs gasoline engine support systems (18%) cover fuel delivery and injection, electronic ignition, intake and exhaust, and emission control. Diagnoses diesel engine support systems (14%) and Repairs diesel engine support systems (12%) cover diesel fuel delivery and injection, intake and exhaust, and emission control. Diesel is 26% of this block, so it cannot be skipped even if your shop rarely sees one.
Block C: Vehicle module communications systems (12 questions)
Official title: Diagnoses and repairs vehicle module communications systems
Two tasks. Diagnoses vehicle networking systems (62%) covers reading diagnostic trouble codes, monitoring data, testing system circuitry and components, and interpreting test results. Repairs vehicle networking systems (38%) covers updating component software, replacing components, repairing circuitry and verifying the repair. These are the networks that let the engine, transmission, body, steering and brake control modules share information.
Block D: Driveline systems (17 questions)
Official title: Diagnoses and repairs driveline systems
Two tasks: Diagnoses driveline systems (57%) and Repairs driveline systems (43%). Each has the same six sub-tasks: drive shafts and axles, manual transmissions and transaxles, automatic transmissions and transaxles, clutches, transfer cases and final drive assemblies.
Block E: Electrical and comfort control systems (23 questions)
Official title: Diagnoses and repairs electrical and comfort control systems
Four tasks. Diagnoses electrical systems and components (36%) and Repairs electrical systems and components (24%) each cover wiring and electrical systems, starting and charging systems and low voltage (12 volt) batteries, lighting and wiper systems, entertainment systems, electrical options and accessories, instrumentation and information displays, and advanced driver assistance system (ADAS) components. Diagnoses heating, ventilation and air conditioning (HVAC) and comfort control systems (24%) and the matching repair task (16%) cover air flow control, refrigerant and heating systems.
Block F: Steering, suspension, braking, control systems, tires, hubs and wheel bearings (23 questions)
Official title: Diagnoses and repairs steering and suspension, braking, control systems, tires, hubs and wheel bearings
Two tasks: Diagnoses (56%) and Repairs (44%) steering, suspension, braking and control systems, tires, wheels, hubs and wheel bearings. Each has four sub-tasks: steering, suspension and control systems; braking and control systems; tires, wheels, hubs and wheel bearings; and the ADAS components related to steering, suspension and braking. Control systems here include antilock braking, traction control and dynamic stability control.
Block G: Restraint systems, body, accessories and trim (10 questions)
Official title: Diagnoses and repairs restraint systems, body components, accessories and trim
Two tasks: Diagnoses (59%) and Repairs (41%) restraint systems, body components, accessories and trim. The sub-tasks are restraint systems; wind noises, rattles and water leaks; interior and exterior components, accessories and trim; and latches, locks and movable glass.
Block H: Hybrid and electric vehicle systems (9 questions)
Official title: Diagnoses and repairs hybrid and electric vehicles (EV) systems
Two tasks: Diagnoses hybrid and electric vehicle (EV) systems (58%) and Repairs hybrid and electric vehicle (EV) systems (42%). The sub-tasks are hybrid vehicle systems, electric vehicle systems, high voltage batteries, and hybrid and EV HVAC systems. The block takes in battery electric, hybrid electric and plug-in hybrid vehicles.
04What kind of questions are on the 310S exam?
The Red Seal Program publishes the mix of question types for each trade. For the 310S it is recall 5 to 15%, procedural 40 to 50%, and critical thinking 40 to 50%. On 125 questions that is roughly 6 to 19 recall questions, 50 to 62 procedural questions and 50 to 62 critical thinking questions.
The exam preparation guide explains the three types:
- Knowledge and recall questions check facts related to doing a sub-task. Sometimes you can name the answer before you look at the options.
- Procedural and application questions test procedures: what the first step is, what order the steps go in. The guide says they can include calculations and the interpretation of diagrams.
- Critical thinking questions check problem solving and analysis. The guide's examples give a symptom and ask for the cause, or give a mistake and ask for the result. Some present information in bullets and need more than one calculation.
For this trade the implication is plain. Up to 95% of the exam can be procedural and critical thinking, so memorizing part names will not carry you. The guide's advice for procedural questions is to know all the procedures described in the standard, not only the ones you have carried out, and to write each one out step by step. For critical thinking it points to the diagrams referred to in the sub-tasks and to knowing which formula applies in which situation. For recall, it recommends index cards built from the "range of variables" lists in the standard, which define the terms used in each sub-task.
05What do you get in the exam room?
The exam preparation guide lists what is provided: an exam booklet, a diagram booklet if one is required, a pencil and eraser, a calculator if one is needed, and a bubble sheet for your answers. It also lists "other reference material, if required": an acronym list, math formulas and code book information. Scrap paper is provided too.
You do not bring your own. The guide's exam room rules say no materials and no electronic devices may come into the room, and it names calculators, phones, tablets and watches specifically. If you need a calculator, one is provided.
For this trade, one of the "if required" items is settled. The Red Seal Program's exam information page for the Automotive Service Technician lists the acronyms that may appear on the exam and says they are provided at the exam sitting as well. The standard carries the same acronyms in an appendix, so those terms are worth learning either way. Whether a formula sheet or any other reference material is handed out for the 310S is not stated; ask your provincial or territorial apprenticeship office when you book. The guide also notes that there may be exam room rules specific to your province or territory.
06Where should your study time go?
Start from the table. The exam preparation guide says it is important to know how many questions each section gets, because that tells you where the marks are.
- Blocks E and F are 23 + 23 = 46 of 125 questions, or 36.8% of the exam.
- Add Block B and you have 46 + 22 = 68 of 125, or 54.4%. More than half the exam sits in electrical and comfort control, steering, suspension and brakes, and engines.
- Add Block D and you have 68 + 17 = 85 of 125, or 68.0%.
- The four smaller blocks, C, G, A and H, are 12 + 10 + 9 + 9 = 40 of 125, or 32.0%.
You need 88 correct answers, and the four largest blocks hold only 85 questions. So you cannot pass on the big blocks alone, even with a perfect score in them. The practical order is: get strong in E, F and B first, then D, then make sure you are not giving away the 40 questions in the small blocks. If you have not worked on high voltage systems, Block H and the hybrid and EV safety sub-task in Block A are where to look first. If you rarely do module programming or network diagnosis, look at Block C. The exam covers the scope of the trade across Canada, not only what you do in your own job.
Inside a block, the standard's task weightings tell you where to lean. Diagnosis outweighs repair everywhere from B to H, most sharply in Block C (62% to 38%). In Block E, the two electrical tasks are 60% of the block and the two HVAC tasks are 40%.
The preparation guide also suggests using practice questions before and after studying, as a gauge of how much you know in each area, and going through every option afterwards to understand why the right answer is right and why the wrong ones are wrong. For a full study method, see how to study for the Red Seal exam.
07How do you use the standard as a checklist?
The Red Seal Occupational Standard is public, and the preparation guide is direct about its role: textbooks can help, but "the occupational standard is the basis of the exam." Every exam question is linked to a sub-task in it. The 2023 Automotive Service Technician standard has 8 major work activities, 23 tasks and 96 sub-tasks, so your checklist has 96 lines.
The guide describes a self-assessment built on that list. For each task and its sub-tasks, rate yourself on a three-point scale:
- You have no or very little understanding or experience.
- You understand it and have some experience in limited situations.
- You have a very good understanding and are fully competent in many situations.
Then set your ratings beside the question counts. A weak rating on a sub-task in a 23-question block costs more than the same rating in a 9-question block. For each weak sub-task, open the standard and read the skills and knowledge statements under it and the range of variables that follows. The guide recommends checking that you understand every term used there, because many of the same terms show up on the exam. Brand names and slang do not. The glossary and acronyms at the end of the standard help here.
One detail saves time. Only "common core" sub-tasks are tested: those that at least 70% of the responding provinces and territories say are performed by journeypersons in the trade. The standard shows the yes or no from each jurisdiction under every sub-task, and marks anything that is not common core.
The official pages: the Automotive Service Technician standard, the exam information page with the breakdown, the Red Seal Program's self-assessment tools and its sample questions.
08Where and how do you write it?
The exam is the same across Canada, but you do not book it with the Red Seal Program. Each province and territory administers it through its own apprenticeship and certification authority, which decides who is eligible and handles fees, booking and what you need to bring. Find your province in the guides by province, compare costs in Red Seal exam fees by province, and see what happens if you fail and how to challenge the exam.
09Sources
- Red Seal Program: Automotive Service Technician exam information: the 125-question count, the number of questions in each block and task, the mix of question types, and the trade acronym list provided at the exam sitting.
- Red Seal Occupational Standard: Automotive Service Technician (2023): the trade's official name, the eight major work activities, the 23 tasks and 96 sub-tasks, the task weightings inside each block and the common core rule.
- Red Seal Program: Red Seal Exam Preparation Guide: the exam format, the four-hour writing time and 70% pass mark, the question types, what is provided in the exam room, the exam room rules and the self-assessment method.
The question counts were checked against the Red Seal Program's exam information page for this trade on September 19, 2026, and the task lists come from the published Red Seal Occupational Standard. If the Red Seal Program changes the breakdown, its page is the final word. If you find one of ours out of date, tell us.
Related: all guides · how many questions are on the Red Seal exam · the Red Seal pass mark · what to expect on exam day · free 310S practice questions
10Practice for this exam
TicketPrep 310S practice tests are weighted to the breakdown above, block by block, and every answer is explained, all four options. You can try five sample questions with no account.
Ten free questions per trade, no account: free practice questions. How our questions are written and checked: how our questions are made.