What Causes the Steering Wheel to Suddenly Become Hard to Turn and Heavy?
3 Answers
The reason why the steering wheel suddenly becomes hard to turn and heavy may be due to a failure in the power steering system. If this occurs, do not continue driving. It is recommended to arrange for a tow truck to transport the vehicle to a repair shop or 4S store for inspection and repair to prevent accidents. Below are the relevant details: 1. Classification of Power Steering: There are three types of power steering systems in cars: electric power steering (EPS), electro-hydraulic power steering (EHPS), and mechanical hydraulic power steering (MHPS). 2. Electro-Hydraulic Power Steering System: Both electro-hydraulic and mechanical hydraulic power steering systems have hydraulic mechanisms, and both utilize a power steering pump. In the electro-hydraulic system, the pump is driven by an electric motor, whereas in the mechanical hydraulic system, the pump is driven by the engine. 3. Electric Power Steering System: The electric power steering system does not have a hydraulic mechanism or a power steering pump. Instead, it relies directly on an electric motor to provide steering assistance. 4. Regular Replacement of Power Steering Fluid: Both electro-hydraulic and mechanical hydraulic power steering systems require the use of power steering fluid. The fluid in these systems needs to be replaced regularly. If left unchanged for a long time, it can cause the steering wheel to become heavy.
I've been driving for many years and am quite familiar with steering systems. When the steering wheel suddenly becomes hard to turn, it's usually due to a failure in the power steering system. For hydraulic power steering vehicles, it could be caused by a faulty power steering pump, insufficient or leaking hydraulic fluid, or a broken/loose belt – all of which can lead to loss of power assist and heavier steering. In electric power steering vehicles, the issue might stem from motor failure, sensor malfunction, or electrical short circuits resulting in loss of power assist. Chassis components like seized steering linkage or extremely low tire pressure can also affect steering, but power assist problems are most common. This is dangerous as it can delay your reaction during turns or emergencies, increasing the risk of losing control and causing accidents. It's recommended to immediately pull over to a safe spot, check power steering fluid or warning lights, avoid forcing the vehicle to move, and call for a tow truck to a professional repair shop. Regular maintenance of the power steering system, such as checking fluids and belts every six months, can help prevent such failures.
When I first bought the car, I encountered a steering wheel as heavy as a rock and immediately pulled over to check. Later, I found out it was due to an aging power steering pump that had failed from lack of timely maintenance. There are many possible causes, such as power steering fluid leaks, clogged fluid lines, or wear on the electric power steering motor, with everyday bumps or prolonged driving accelerating the damage. Tire issues like low pressure or sidewall deformation can increase steering resistance, but usually, the power steering system fails first. After learning my lesson, I always remember to pay attention to the power steering system during maintenance, such as having the technician test hydraulic pressure or motor operation. Otherwise, steering difficulties can increase driving risks, especially at high speeds or in rainy conditions when control is harder. Safety first—address issues promptly to avoid bigger troubles.
