Is it safe to work under a vehicle that is on a hoist if the HV system is de-energized?

• A. No, never.
• B. Yes, but only if the OEM procedure is followed and the vehicle is secured; standard hoist and fall-protection precautions apply.
• C. Yes, always regardless of procedure.
• D. Only with a safety engineer present.

Answer: (C)

De-energizing the high-voltage system removes the electric shock risk from HV components, which is the primary danger when working around EV powertrains. Once you’ve confirmed the HV system is de-energized, the electrical hazard is effectively eliminated, so from an HV safety perspective it is permissible to work under a vehicle on a hoist. Of course, you still manage other risks that come with being under a raised vehicle—secure the hoist and follow standard fall-protection and general shop safety practices. The emphasis in this scenario is that the electrical risk is addressed by de-energizing the HV system, which is why the option stating it’s safe is considered correct.