* Power Steering Pump Failure: The most probable cause of that high-pitched, whining, chainsaw-like noise is a failing power steering pump. The internal components (gears, vanes, or a worn-out bearing) are likely grinding against each other. This is a common failure mode, especially in older vehicles.
* Low Power Steering Fluid: While less likely to sound exactly like a chainsaw, extremely low fluid can cause the pump to work harder and generate unusual noises. Check your power steering fluid level immediately. However, if the fluid level is low, do *not* just add fluid – there's likely a leak somewhere causing the low level, and adding more fluid might just make the problem worse.
* Power Steering Belt Issues: A slipping or severely worn power steering belt *could* contribute to a high-pitched whine, but it's less likely to sound exactly like a chainsaw. Inspect the belt for cracks, wear, and proper tension.
* Power Steering Rack and Pinion Issues: While less common, a severely damaged rack and pinion can contribute to unusual noises, but usually not as high-pitched as a chainsaw.
What you should NOT do:
* Continue driving the car: Driving with a severely damaged power steering pump can cause catastrophic failure, potentially leading to loss of steering control.
* Ignore the noise: The problem will only get worse and could cause more extensive (and expensive) damage.
What you SHOULD do:
1. Check the power steering fluid level: Locate the power steering fluid reservoir (usually a small, clear plastic container) and check the level. Do not add fluid yet.
2. Inspect the power steering belt: Check for cracks, fraying, or slippage.
3. Have it towed to a mechanic: Given the severity of the noise, attempting a DIY fix is not recommended. A mechanic can diagnose the precise issue (pump, belt, or something else) and perform the necessary repairs. Delaying this could lead to expensive repairs down the line, or even a dangerous driving situation.
The chainsaw sound strongly indicates significant internal damage to the power steering pump, making replacement likely necessary. Get it checked out immediately to avoid further damage and ensure your safety.
