Power Steering Problems: Heavy or Whining Steering
Power steering problems usually show as steering that has gone heavy or makes a whining noise. Older cars use hydraulic power steering with fluid, where low or old fluid is a common cause, while newer cars use electric power steering, which tends to flag a warning light. First, rule out a simple cause like a low front tyre.
Two types of power steering
Power steering reduces the effort needed to turn the wheel, especially at low speed and when parking. There are two main types, and knowing which your car has helps make sense of a fault.
Hydraulic power steering, used on older cars, uses a pump driven by the engine and hydraulic fluid to assist the steering. Electric power steering (EPS), used on most newer cars, uses an electric motor instead, with no fluid. The likely faults differ between the two.
Hydraulic system faults
On a hydraulic system, fluid is central, so its level and condition matter.
- Low fluid, often from a leak, causing heavy steering and a whine.
- Old, degraded fluid reducing assistance.
- A failing pump, often noisy, especially at full lock.
- A slipping or worn drive belt that turns the pump.
A whining noise that rises when you turn, especially with heavy steering, often points to low fluid or a struggling pump.
Electric system faults
Electric power steering has no fluid to check, and faults usually show up as a warning light or a sudden change in assistance rather than a gradual whine.
Common issues include a fault in the electric motor or its sensors, or a temporary loss of assistance linked to low battery voltage or an electrical glitch. Because EPS is integrated with the car's electronics, diagnosis generally needs fault codes read rather than a simple fluid check.
Check the simple things first
Before assuming an expensive power steering fault, rule out simpler causes of heavy steering. A significantly under-inflated front tyre makes the steering feel heavy, so check your tyre pressures first; it is free and a common culprit.
Heavy steering at very low speed can also be normal on some cars when stationary or just moving off. And a whine that is really from a worn belt or a wheel bearing can be mistaken for power steering, so it is worth confirming the source.
Why you should not ignore it
Power steering problems are worth addressing both for ease of driving and for safety. Steering that suddenly goes heavy, particularly at speed, can be alarming and harder to control, and a complete loss of assistance makes the car much heavier to steer, especially in an emergency.
On a hydraulic system, low fluid from a leak will only get worse, and a failing pump or belt can leave you with no assistance. So heavy or whining steering should be investigated rather than lived with.
Getting it diagnosed
Because the cause depends on the system type and ranges from low fluid to electrical faults, a proper diagnosis is the sensible route. We can check the fluid and pump on a hydraulic system, read fault codes on an electric system, and rule out simple causes like tyre pressures or a worn belt.
We can then advise on the fix as part of a service or repair. If your steering has gone heavy or started whining, get it checked so it stays light, predictable and safe.
Frequently Asked Questions
Why has my steering gone heavy?
Heavy steering can mean a power steering fault: on hydraulic systems often low or old fluid or a failing pump, and on electric systems an electrical fault that usually flags a warning light. But first rule out a simple cause like a significantly under-inflated front tyre, which is free to check.
Why does my power steering whine?
A whine that rises as you turn, especially with heavy steering, usually points to a hydraulic system that is low on fluid (often from a leak) or has a struggling pump. A worn drive belt turning the pump can also whine. It is worth checking the fluid and having the system inspected.
What is the difference between hydraulic and electric power steering?
Hydraulic power steering, on older cars, uses an engine-driven pump and fluid to assist the steering, so fluid level and condition matter. Electric power steering, on most newer cars, uses an electric motor with no fluid and usually flags a warning light when faulty. The likely faults differ between them.
Can a low tyre make my steering heavy?
Yes. A significantly under-inflated front tyre makes the steering feel heavy, so it is worth checking your tyre pressures before assuming an expensive power steering fault. It is free and a common culprit. Correct pressures may simply restore normal steering feel.
Is it safe to drive with a power steering fault?
It is best not to ignore it. Steering that suddenly goes heavy, especially at speed, is harder to control, and a complete loss of assistance makes the car much heavier to steer in an emergency. On hydraulic systems a fluid leak only worsens, so have it investigated rather than lived with.
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