Groaning sound when turning

Could also be low on power steering fluid, Have you checked your fluid level lately?

Thanks,
Power steering fluid is fine and yes it only does it when turning. It has done it for quite some time but is getting a little worse. It also squeaks at very low speeds and breaks have been checked out and nothing wrong there.

The squeak is when rolling at low speed and brake pedal not depressed.(Slow like rolling forward in a line of traffic waiting to turn)It pretty much stops once I take off. It does make the groaning noise when driving in a circle and I believe it is from the rear. I would consider it a rotational noise. I will try the flush and get back to you

To get rid of noise, you will need to buy 8 containers of VersaTrak Fluid GM P/N 12378514 at any GM dealer. Drain the fluid in the rear differential, add 4 containers until the last one drips out, stop filling, and re-install drain plug. Drive in 8 tight figure 8's, then drive 10 miles. Again, drain out the fluid in the rear differential, add 4 containers until the last one drips out, stop filling, and re-install drain plug. Drive in 8 tight figure 8's and you will notice the noise is gone immediately or after several miles. My moan/groan noise didn't stop until after I drove on a long trip.