48V low-voltage basics
Cybertruck runs a 48V low-voltage system. What that means for jump-starts, steering on external power, and accessories.
What's different
Most cars use 12V for low-voltage systems; Cybertruck uses a 48V architecture.
Source: Tesla DIY guide: Jump Starting (cautions) · checked Nov 6, 2026Tesla's cautions (read before connecting anything)
- Cybertruck cannot be used to jump-start another vehicle. Doing so can cause damage.
- Steering may be harder while the truck is supported by an external low-voltage supply; the wheels may not respond as expected. Use extreme caution if you reposition it.
- Below 30V (for example another vehicle or a 12V jump pack), some functions may be unavailable or degraded.
- Avoid using climate, USB-C ports or lights while on external power; it can drop the system again.
- With a variable power supply, don't change the voltage while cables are connected.
- Shut off the external supply before removing either cable, to avoid arcing.
Jump-starting Cybertruck
Tesla's procedure: open the frunk with the no-power method, remove the maintenance panel, connect red (+) to the horizontal post next to the brake fluid reservoir and black (−) to the vertical post. Use cables 30 ft or shorter. If you're using a variable power supply, set it between 12V and 16.5V or between 30V and 50V before turning it on. The touchscreen can take up to two minutes to respond. When done, turn the supply off, then disconnect black first. The truck may not shift into Drive until the high-voltage battery has charged and the low-voltage system recovers.
Source: Tesla DIY guide: Jump Starting (cautions) · checked Nov 6, 2026Accessories
Don't splice accessories into vehicle wiring. Use the outlets Tesla provides (see Powershare and outlets) or accessories built for the truck. Anything touching high voltage, steering, brakes or airbags is for Tesla or qualified technicians.
General owner information, not factory service instructions. If anything here conflicts with your owner's manual or the Release Notes in your truck, those win.