Yes, you can usually still drive with a power steering assist fault, but the steering will be noticeably heavier and control can be compromised; drive cautiously and seek service as soon as possible.
Understanding what a steering assist fault means
Power steering systems come in two main flavors: hydraulic power steering (HPS), which uses a belt-driven pump and fluid to assist steering, and electric power steering (EPS), which uses a motor and sensors controlled by the vehicle’s computer. A fault triggers a warning and often reduces or removes assist. The exact behavior depends on the car’s design, the fault’s nature, and whether the vehicle switches into a “limp” or manual mode.
Is it safe to drive with a fault?
In most cases, you can still steer the vehicle, but you’ll notice greater effort required to turn, especially at low speeds or when parking. Some cars may retain some assist at higher speeds, while others may enter a degraded or no-assist state to protect the system. High-speed maneuvers become riskier, so drive slowly, avoid aggressive steering, and plan a route to a service facility as soon as you can safely do so.
Before you move on, it helps to understand common causes and the right steps to take in this situation.
Common causes of a steering assist fault
These are the typical reasons a steering assist system may report a fault. Not all faults are equal, and some are temporary while others indicate a hardware problem.
- Hydraulic power steering issues: low fluid level, leaks, worn or slipping pump, or a damaged belt affecting pump drive.
- Electric power steering (EPS) faults: steering-angle sensor failure, motor or control module fault, wiring harness damage, or software calibration error.
- Electrical power supply problems: weak or fluctuating battery voltage can reduce assist in EPS systems.
- Mechanical faults: binding or damaged steering rack, column, or linkages can trigger faults or reduce performance.
- Intermittent or sensor-related faults: some EPS or hydraulic issues come and go and require professional diagnostics to confirm the cause.
The takeaway: many faults require inspection and repair by a technician. If the steering feels unpredictable, stop driving when safe and seek assistance rather than pressing on to a distant destination.
What to do if you notice a power steering fault
When a fault is detected or the warning light illuminates, follow these practical steps to minimize risk and prepare for service.
- Check the dashboard warning light or message. If there is any doubt about the severity, treat it as a potential safety issue and proceed with caution.
- If your vehicle uses hydraulic power steering, inspect for obvious issues: is the fluid level low or is there a visible leak? Do not operate the vehicle if the system is leaking or making unusual noises.
- If you suspect electrical issues, avoid driving long distances and consider scheduling a tow to a repair facility rather than attempting a long trip.
- Drive cautiously: keep both hands on the wheel, plan longer stopping distances, and avoid high-speed driving or sharp lane changes.
- Use a safe route to a qualified technician. If you’re unsure about safety, contact roadside assistance.
Following these steps can reduce risk, but driving with a steering assist fault is not something to ignore. A professional diagnosis is essential to determine whether the fault is temporary or signals a failing component that could worsen.
What to expect at the repair shop
At a service appointment, technicians will typically:
• Retrieve diagnostic trouble codes (DTCs) from the vehicle’s computer to identify whether the fault is electrical, sensor-related, or hydraulic.
• Inspect the hydraulic system (if applicable) for fluid level, leaks, and pump condition, and test the belt drive.
• Check the EPS components, including the steering-angle sensor, electric motor, control module, and wiring harness, and verify software calibration.
• Test the overall steering feel and perform functional tests to confirm the issue and its safety implications.
• Recommend repairs, which may involve replacing a sensor, motor, pump, lines, or wiring, or performing software updates/calibration. In some cases, the fault is intermittent or related to a low-voltage supply that requires a battery or charging system service.
Bottom line for drivers
A steering assist fault is a serious warning, but most cars remain drivable—often with significantly heavier steering. The safest course is to treat the issue as actionable: limit driving, seek professional diagnostics, and proceed with repairs promptly to restore normal steering feel and safety margins.
Summary
A power steering assist fault does not always render a car undrivable, but it can make steering noticeably harder and unpredictable. You can usually drive a short distance with caution, but you should avoid high-speed driving and aggressive maneuvers, and you should seek professional service promptly. Understanding whether your vehicle uses hydraulic or electric steering helps you anticipate symptoms and plan the safest course of action. Regular maintenance, attention to warning lights, and timely repairs are essential to maintain safe steering performance.