* Power Steering Pump: This is a common culprit. A failing power steering pump can make a grinding noise, especially under load (like when turning the wheel). Low power steering fluid level will exacerbate this. Check your fluid level immediately. If it's low, adding fluid might temporarily quiet the noise, but it's still a sign of a failing pump.
* Power Steering Rack and Pinion: The rack and pinion is the mechanism that converts the steering wheel's rotation into movement of the wheels. Worn gears or low fluid within the rack and pinion can cause a grinding noise. This is a more serious and expensive repair.
* Steering Linkage: Various components in the steering linkage (tie rod ends, ball joints, etc.) can wear out and cause grinding or clicking sounds. These should be inspected visually for play or damage.
* Wheel Bearings: While less likely to produce a *grinding* sound specifically when turning, severely worn wheel bearings *can* contribute to noises that worsen with steering input. Jack up the car and check for play in the wheels.
Troubleshooting Steps:
1. Check Power Steering Fluid: This is the absolute first step. Look for leaks and check the fluid level. Top it off if low (using the correct type of fluid), and see if the noise improves. If it does, you still have a problem (likely the pump), but it's not an immediate emergency.
2. Listen Carefully: Is the grinding constant while turning, or does it happen only at certain points in the steering wheel's arc? This can help pinpoint the location of the problem.
3. Visual Inspection: Look under the car for any obvious leaks or damage to the steering components.
4. Professional Inspection: If the fluid level is okay and you still hear grinding, a mechanic should inspect your steering system. This is not something to ignore, as continued use with a failing power steering pump or rack and pinion can cause further, more expensive damage.
Safety Note: If the grinding is severe, avoid driving the car until it's been inspected by a mechanic. Driving with a severely damaged steering system can be dangerous.
