I have a 2020 Silverado 2500HD LTZ 6.6 gas and it’s always had a power steering wine sound. I didn’t think much of it until today. Checked the fluid and it is on the add line. Wondering if it’s always been like that? Did it come off the line without enough steering fluid? That’s pretty annoying if that’s the case, but I’ll be picking some up tomorrow and filling it to where it needs to be. No sign of a leak or anything so really not sure what else to do.