2006 gmc envoy_slt
Looking for some help. Just yesterday, I noticed a whining noise coming from the engine when it's rev'd (not high pitch or anything, just know there's definitely something different sounding with the engine). I've read stuff about fan clutch going out and high pitch noise, but the noise seems to be coming from the power steering pump or something in that area and not at a super high pitch noise that's described for fan clutch problems. I've scanned it but no trouble codes come up. My wife owns a Isuzu Ascender with the same I6, but it doesn't have that noise. Should I be concerned? Any ideas on what possibly it could be?