What is an EPS fault?

[LaMadeline]

EPS fault refers to a malfunction in the Electric Power Steering system, with symptoms including: heavy steering, abnormal steering noise, steering wheel vibration, poor steering wheel return ability, etc. It is recommended to promptly visit an auto repair shop for inspection and repair. If there is an issue with the Electric Power Steering system, the power steering assist function will be lost, causing the steering wheel to suddenly become heavy. In the event of an emergency, the consequences could be unimaginable. The working principle of EPS is: when the steering wheel is operated, the torque sensor mounted on the steering column continuously measures torque and angle signals. These signals, along with the vehicle speed, are input into the Electronic Control Unit (ECU). After calculation and processing by the ECU, it controls the motor to output a corresponding magnitude and direction of torque signal. The motor's main torque is then increased and slowed down by the reducer before being applied to the steering system to achieve the vehicle's power steering effect.

[DelEmiliano]

I've been repairing cars for decades. EPS failure refers to problems with the Electric Power Steering system, which can suddenly make the steering wheel heavy and very difficult to handle while driving. The most common causes are sensor failures, such as a malfunctioning steering angle sensor, which prevents the system from determining the direction; or a stuck motor, resulting in insufficient power assistance; it could also be due to aging wiring causing short circuits or blown fuses. Last time I helped someone fix it, the issue was low battery voltage—the EPS would alarm as soon as it started, and replacing the battery solved it. The troubleshooting steps are simple: first, disconnect the battery cables and wait a few minutes to reset the system; if that doesn’t work, use a diagnostic tool to read the fault codes. Don’t ignore this issue—unstable steering on the highway is very dangerous, so it’s best to get it checked by a professional shop early. Avoid tampering with the motor module yourself, as it’s easy to damage and more expensive to repair. In daily driving, avoid excessive steering to reduce strain on the system.

[AndrewLynn]

Having driven for over 20 years, what I fear most is EPS failure. This causes the power steering to disappear, making the steering wheel feel as heavy as if it's locked, especially when turning on crowded streets—it really tires out your arms. The main fault points include sensor failures where positions aren't reported, loose wire connections causing unstable voltage, or the motor overheating protection kicking in. On rainy days, if the chassis gets damp, it might short-circuit and trigger the warning light. If you notice anything unusual, slow down immediately and pull over, then call for roadside assistance with your phone—don't push through. For prevention, I check tire pressure and battery health monthly, as EPS is prone to errors when the battery ages. During regular maintenance, ask the shop to perform a steering system scan—spending around a hundred bucks can prevent future issues. Safety comes first; if EPS faults aren't fixed promptly, an accident could turn into a serious problem.

[LukasLynn]

I'm quite fascinated by automotive technology, and EPS failures can indeed be quite complex. It relies on electric motor assistance for steering, but when issues arise—such as control module software bugs or interrupted signal lines—the steering wheel becomes unresponsive. Common causes include sensor malfunctions like torque detectors failing; aging motor coils overheating can also cause jamming; the system might even falsely report errors due to battery power drops. Using an OBD scanner can quickly identify trouble codes—for instance, codes starting with 'C' often indicate communication faults. The reset method is simple: turn off the engine and wait a few minutes for automatic recovery. Understanding these aspects helps protect the system by avoiding frequent sharp turns in daily use, saving both hassle and repair costs.