Power Ground (PWRGND)
WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
The PWRGND circuits are directly connected to the battery negative terminal. The PWRGND circuits provide a return path for the PCM vehicle power (VPWR) circuits.