What does it mean when power steering default comes on.

You're driving Your vehicle, when the power steering light comes on. Typically, this indicates that the power steering fluid is low, and needs to be refilled. If this is the case, You will need to know the make and model of Your vehicle in order to find the correct fluid. This is critical to prevent irreparable damage to Your system. In most cases, power steering fluid can be purchased in one quart containers, averaging between $3 and $34 for the fluid alone. If You have it changed by a professional, You may pay between $24 and $148 for labor.