Most of the parts a service contract was written around are the same parts found in a gasoline car: the engine, the transmission, the steering, and the brakes. A plug-in hybrid or a fully electric car adds parts that older contract wording may not name, such as a high-voltage traction battery, electric drive motors, inverters, an onboard charger, and the charge port. Whether those parts appear on the list is the opening fit question.
Start with the covered-systems list
Read the section that lists the systems the contract covers. Search for battery pack, traction battery, electric motor, drive unit, inverter, converter, onboard charger, and charge port. Note whether those parts appear by name or only under a general heading such as electrical system. A general heading may include them or may not. Ask the seller which reading the company applies, and ask for that answer in writing.
Separate the battery terms
Many electric and plug-in cars come with battery coverage from the maker for a set period. Find that coverage in the owner paperwork. Then ask whether the service contract starts where the maker's battery coverage ends, overlaps with it, or runs on its own clock. Ask what proof the contract wants for battery work, and whether the maker's service records will be accepted as that proof.
Look at the charging hardware
Ask whether the home charger, the charging cable, and the wall unit count as part of the car for contract purposes. Many owners buy these separately from the car. Ask whether a fault in the charger that damages the car's charging system is treated as a car fault or an equipment fault, and who decides which one it is. Ask whether the contract requires a particular installer, permit, or inspection for the charger to stay within its terms.
Match the maintenance list to the car
A plug-in car does not need the same routine work as a gasoline car. Ask whether the contract's maintenance list was written for an engine-and-transmission car, and how it treats the work your car does require. Ask what the contract accepts as proof of that work.
Ask about software and calibration
Electric and hybrid parts depend on software. Ask whether a software fault or a calibration step is treated as a repair, whether the work must be done by a dealer, and whether an update the maker releases is a condition of staying within the contract. Get those answers in the contract wording, not only from a sales conversation.
Read the paper before you choose
Companies that publish a sample contract let you read the parts list before you buy. Use the list of vehicle service contract companies that post a sample contract you can read first to find those companies, then compare how each one names the high-voltage parts.