Symptoms
- Steering wheel suddenly becomes very hard to turn while driving
- Possible warning light appearing at the same time
- Possible squealing noise from under the hood if belt-related
Likely causes
- CommonSnapped serpentine belt (hydraulic systems)If the belt driving the power steering pump breaks, assist is lost immediately.
- CommonSudden major fluid loss from a burst hoseA ruptured hose can drain the system quickly, removing hydraulic assist.
- PossibleElectric power steering system failureOn electric systems, a fault can shut off assist suddenly, sometimes with a warning light.
What to do
- Grip the wheel firmly with both hands, since steering is still possible without assist, just much harder.
- Slow down gradually and move to a safe place to pull over, using extra steering effort as needed.
- Check under the hood for a broken belt or a puddle of power steering fluid if your car has a hydraulic system.
- Note any warning lights that appeared at the same time as the loss of assist.
- Have the vehicle towed or inspected before driving further, since the underlying cause needs to be fixed, not just worked around.
Tools and parts
Serpentine beltSearch: “serpentine belt for [your car model]”
Power steering pump or hoseSearch: “power steering pump for [your car model]”
When to call a pro
Have the vehicle inspected before driving again, since the cause (broken belt, fluid loss, or electrical fault) needs a proper repair, not just topping off fluid.
Safety
Use caution
Losing power steering assist while driving makes the car much harder to control, especially at low speed or when parking; get to a safe stop and don't continue driving until it's diagnosed.