I never thought that I had the PS issue, but after several months of focusing on it I can feel it in the steering wheel.JayTee2014 said:Our 2015 Equinox LTZ with the 3.6L V6 also has a bit of slight shudder when turning the steering wheel when standing still or in slow maneuvers. It is more noticeable when the engine and fluids are cold the first start of the day or in the now colder winter weather.
I know there was a change in the hydraulic power steering hoses or sizes/connections awhile model year or two ago, and the issue is reduced. After the vehicle is warmed up it is barely noticeable, but still there.
I am guessing that it has to do with the size of the power steering pump and the load upon it. I am further guessing that the pump is rather small in capacity ( also size and weight) in order to save fuel by using only minimal energy from the engine, since the pump is belt driven. Therefore, when the vehicle is not moving and there is maximum load on the power steering pump it "groans" a bit due to turbulence the extra load puts upon the pump.
I am not too concerned, since I have had some cars I have owned do this years ago. I had my dealer service write note it on my last oil change visit and he said to let him know if it becomes a problem.
Hardly noticeable but it's there, can't hear it.
Because I live in a warmer climate I don't see the change in colder weather.
Mine is less noticeable when I first start the engine, I think because of the higher RPM's.
One last item, GM changed the V-6 Power Steering pump in 2012.
Part # 13580490 is what they call "2nd Design" for a reasonable $89 at GM Parts Direct