Nvidia-smi --query-gpu=power.draw Can this be used to detect if the GPU is working?

Hi all, does anyone know if checking the power draw is an accurate way of identifying a GPU that is either not active or working?

Here is an example below, GPU#0 shows as Unknown Error for the power draw, as well as ERR! with a plain nvidia-smi command. What would cause this? and even after the process have completed, it remains in that state.

Anyone have encountered this?

nvidia-smi --query-gpu=index,gpu_bus_id,power.draw --format=csv

index, pci.bus_id, power.draw [W]
0, 00000000:05:00.0, [Unknown Error]
1, 00000000:08:00.0, 47.37 W
2, 00000000:0D:00.0, 26.26 W
3, 00000000:13:00.0, 31.40 W
4, 00000000:83:00.0, 160.10 W
5, 00000000:89:00.0, 189.70 W
6, 00000000:8E:00.0, 196.36 W
7, 00000000:91:00.0, 187.79 W

±----------------------------------------------------------------------------+
| NVIDIA-SMI 418.67 Driver Version: 418.67 CUDA Version: 10.1 |
|-------------------------------±---------------------±---------------------+
| GPU Name Persistence-M| Bus-Id Disp.A | Volatile Uncorr. ECC |
| Fan Temp Perf Pwr:Usage/Cap| Memory-Usage | GPU-Util Compute M. |
|===============================+======================+======================|
| 0 Tesla P100-PCIE… Off | 00000000:05:00.0 Off | N/A |
| N/A 44C P0 ERR! / 250W | 0MiB / 16280MiB | 100% Default |