So, received this error today doing a pre-trip test, EC62, kohler 5ECD, 2007ish. I believe it indicates water pressure issue. I checked and there was a ton of debris in the basket, emptied that out, opened the sea cock, cranked it up, more water coming out of the exhaust, looked good. Turned on AC, and threw that error again. Checked basket, it was clean this time. Next steps? I will Replace impeller and oring, what about the water pressure sensor, I think it’s GM30263? Where would I find one before Wednesday? I’m guessing auto parts stores would not have an equivalent part?