* Low Power Steering Fluid: This is the simplest and most common cause. Check your power steering fluid reservoir. If it's low, add the correct type of fluid (check your owner's manual). If it's very low and you find leaks, address those leaks before adding fluid.
* Power Steering Pump Failure: The pump is what circulates the fluid. A failing pump might make groaning or whining noises, leak fluid, or simply stop working altogether. This usually requires replacement.
* Power Steering Belt Broken or Loose: The serpentine belt (or sometimes a dedicated power steering belt) drives the power steering pump. If it's broken or loose, the pump won't operate. Check visually for breakage or looseness.
* Power Steering Hoses: Check all hoses for leaks, cracks, or kinks. A leak will deplete the fluid, and a kink will restrict flow. Damaged hoses need replacement.
* Power Steering Rack and Pinion Problems: This is the steering mechanism itself. Internal problems within the rack and pinion can cause a loss of power steering. This is a more complex and expensive repair.
* Power Steering Pressure Sensor or Switch (if applicable): Some models have sensors or switches that can malfunction and prevent the system from working. This is less common but possible.
* Electrical Issues (for Electric Power Steering): If your Bonneville has electric power steering (less common on older Bonnevilles), a fault in the electrical system, including the motor, computer module, or wiring, can lead to loss of power steering.
* Steering Column Issues: Problems within the steering column itself are less frequent but could impact power steering function.
Troubleshooting Steps:
1. Check the fluid level: This is the first and easiest step.
2. Inspect the belt: Make sure it's intact and properly tensioned.
3. Listen for unusual noises: Whining, groaning, or squealing sounds can indicate pump or belt problems.
4. Look for leaks: Inspect all hoses and the pump for any signs of leaks.
If you're not comfortable working on your car yourself, take it to a qualified mechanic for diagnosis and repair. Attempting repairs without proper knowledge could lead to further damage or injury. Providing the year of your Bonneville would help narrow down the specifics of the power steering system.
