Hi rjripley, welcome to the forum.
It's a small group here so replies take a while sometimes.
Hope you enjoy this car despite this glitch.
I have had my car for a year and so far had no problems. I really like this car.
I agree with GizmoEV that the fault may be something trivial like a loose wire or fuse.
I google searched EWP failures and came up with nothing for any EV.
So you are the first. Please report back if you know anything more.
This thread is where people will come if they search for EWP faults.
Anyway I will post the info I do have about the EWP. (more to be added later)
The EWP in the Soul EV is made by Myunghwa Ind.CO.,LTD in South Korea.
On that page is a comparison to the functioning of a belt driven pump (left) with an EWP (right)
The pump sits underneath the coolant reservoir. Here's a photo of it.
(Strangely this website is rotating the image 180 degrees. Click view image and you see it correctly))
Here's a picture with the OBC and the High Voltage Junction Box moved so you can see the Reservoir (the white plastic water tank) and pump beneath.
Here's a schematic of where the EWP moves coolant around.
The codes for using Torque Pro can be found by clicking the link in the website icon under my user name on the left.