EV & Hybrid Systems
The next 10 years of automotive work.
EV & Hybrid Systems covers high-voltage safety, hybrid system diagnosis, and pure EV service. As of 2026 this is the fastest-growing service category and a durable differentiator. Everything below is free, no login, no paywall. Work through the skill areas, drill them in Study Mode, and when you're ready, prove it with the certification exam.
Your readiness to certify
Drill all 60 concepts in Study Mode. Mark each one "Got it" once you know it cold. When every concept is cleared, you're ready for the EVH exam.
What you'll be able to do
- High-voltage safety protocols: PPE, disable procedures, lockout
- Hybrid system architecture (parallel, series, series-parallel)
- Battery pack diagnosis at the module level
- DC-DC converter diagnosis
- Electric motor and inverter fundamentals
- EV-specific service: regenerative brakes, thermal management
- Level 2 charging equipment troubleshooting
- Common failure modes on Tesla, Nissan Leaf, Chevy Volt/Bolt, Rivian
Skill areas
24 lessons, each one short enough to finish in a break. Every lesson teaches the system from the ground up, ends with a call to work, and tracks which concepts you have cleared.
Fundamentals
Before you touch a scan tool, you need to know what kind of electrified vehicle is on your lift.
High Voltage
Every electrified vehicle carries a traction battery whose voltage is far beyond anything on a conventional car.
Safety
High-voltage safety is the single most important skill in this trade.
Cell Chemistry
Not all lithium batteries are the same, and the chemistry inside the cells determines range, fire behavior, lifespan.
BMS
The Battery Management System is the brain of the traction pack.
Cooling
Batteries hate heat, and modern packs generate plenty of it under fast charging and hard driving.
Motor
The traction motor is the heart of an EV drivetrain.
Regenerative Braking
Regenerative braking changes both how EVs drive and how they wear.
Inverter
Between the DC battery and the AC motor sits the power electronics that make an EV possible.
Charging
Charging is where the customer lives with their EV every day, and charging complaints are among the most common EV tickets you will see.
Diagnostics
EV diagnostics blends familiar scan-tool work with a category of testing that does not exist on ICE vehicles.
12V System
It surprises new EV techs every time: the most common no-start on an electric vehicle is the little 12-volt battery, not the big traction pack.
Motor Cooling
Traction motors make serious heat under load, and how a manufacturer cools the motor determines how long it can sustain full power.
Toyota Hybrid
Toyota's hybrid system is the most common electrified drivetrain in the world, and every general repair shop will see Priuses.
Tesla
Teslas are everywhere, but servicing them is a different business proposition than servicing most brands.
Emissions
Going electric does not mean escaping regulation.
Regen
Some of the most common EV 'complaints' are the system working exactly as designed.
HV Contactor
Contactors are the heavy-duty relays that connect and disconnect the traction pack from the rest of the vehicle.
Heater
An ICE heats the cabin with free waste heat; an EV has to spend battery energy to stay warm.
Range
Winter range loss is the number one complaint from first-winter EV owners, and most of it is physics, not failure.
Regulation
The regulatory landscape around EVs touches both your customers' wallets and your own qualifications to do the work.
Tools
The meter in your hand is life-safety equipment on an HV job.
Range Test
Customers ask one question about used and aging EVs: how much battery is left?
Documentation
On high-voltage work, the paperwork is part of the safety system.
Studied the material? Get EVH certified.
The EV & Hybrid Systems exam turns what you just learned into a verifiable credential drivers and shops can look up. 60 questions · 75 minutes · 78% to pass · Free.
Studying on MechanicRank is free forever. There's no obligation to take the exam.
Standards and further reading
Primary sources behind this page. Federal safety, emissions and consumer-protection references, worth reading before you authorize any repair.
- DOE Alternative Fuels Data Center: electric vehicles Federal reference on EV drivetrains, batteries and charging.
- ASE certification The national standard for automotive technician testing and certification.
- OSHA motor vehicle safety Workplace safety standards for lifting, chemicals and shop equipment.
- California Bureau of Automotive Repair Licensing, consumer complaints and shop regulation in California.