Stop and get help

A low-voltage battery does not automatically make the EV a donor vehicle

An EV can use a low-voltage electrical system for computers, locks, lights, relays, and control modules while still having manufacturer restrictions on supplying current to another vehicle’s starter. Do not experiment with terminals simply because they measure about 12 volts. Follow the exact vehicle manual. Never touch orange high-voltage cables, service disconnects, traction-battery connectors, or damaged high-voltage components.

These three roadside situations are not the same

Your EV has a dead low-voltage battery
Using the EV manufacturer’s own recovery or jump procedure

The manual may identify specific low-voltage access points, a sequence for external power, or a towing procedure. That procedure is about waking up your EV, not necessarily helping another car.

Another car needs a jump and your EV is healthy
Checking whether donor use is explicitly allowed

Some EVs are not designed to supply starter current to another vehicle. If the manual does not authorize it, use a purpose-built jump pack or roadside service instead.

The EV has an AC outlet or vehicle-to-load feature
Loads specifically supported by that outlet or system

An onboard AC outlet or bidirectional power feature is not the same thing as clamping jumper cables onto the low-voltage system. Use only the loads and adapters the manufacturer approves.

Either vehicle is crashed, flooded, smoking, or unusually hot
Emergency response rather than a jump-start attempt

Move people to a safe location and follow emergency or roadside guidance. Electrical recovery is not the priority when damage or fire risk is present.

Use this decision order before opening the cable bag

  1. 01
    Identify the exact EV year and model

    Do not rely on a video for a similar trim or previous model year. Low-voltage battery chemistry, jump points, and restrictions can change.

  2. 02
    Search the owner’s manual for jump-start donor instructions

    Look for language about jump-starting another vehicle, booster cables, external power, low-voltage recovery, or prohibited uses. A procedure for receiving a jump does not prove donor use is allowed.

  3. 03
    Use a portable jump starter when donor use is unclear

    A properly rated jump pack avoids asking the EV’s low-voltage system to provide starter current it may not be designed to supply. Follow the jump-pack and disabled-vehicle instructions.

  4. 04
    Stop if anything looks damaged or behaves unexpectedly

    Do not keep reconnecting cables after sparks, repeated faults, hot wiring, swelling, smoke, or warning messages. Arrange professional help instead.

Before a road trip, know what your EV actually carries

  • The location and type of the EV’s low-voltage battery or approved external-power points.
  • Whether the vehicle is allowed to jump-start another car at all.
  • The correct low-voltage recovery procedure if the EV itself will not wake up.
  • A portable jump starter that is compatible with the disabled vehicle you may need to assist.
  • Roadside-assistance contact information when the manual prohibits or does not explain donor use.