One problem related to power steering light on has been reported for the 1999 Chevrolet Suburban. The most recently reported issues are listed below.
While driving slowly at different times in cooler weather(not noticible in hot months), and not every single time, turning to the right around a curve or turning a corner the steering holds the turn and then all of a sudden lets go of that hold (tension is lost). I can correct for it by returning the steering wheel to the left slightly and then back into the turn. Sometimes it holds the second time and sometimes it lets go again. This is repeated until the end of the curve or turn.