Your electric power steering warning light signals a problem with the steering system that needs attention soon

The electric power steering warning light — usually a steering wheel with an exclamation mark or the letters "EPS" — tells you that your car's power steering computer has detected a fault. This is not a light you can ignore until next month. The system may still work, but it could fail without warning, and when it does, steering becomes much harder. You need to have the car diagnosed within a few days, not weeks.

The light appears on your dashboard when the car's onboard computer runs a self-check and finds a problem in the electric power steering circuit. Unlike older hydraulic systems, electric power steering uses an electric motor to information your steering. When that motor, its wiring, the control module, or the sensors that feed it information develop a fault, the computer turns on the warning light and may reduce steering information to protect you from a sudden complete failure.

Key Takeaways

  • The electric power steering warning light means the steering system has a detected fault and you should not drive the car long distances until a mechanic checks it.
  • The light can be triggered by a dead battery, a loose battery cable, a faulty steering angle sensor, a bad electric motor, or a failure in the control module.
  • A mechanic will need to plug a diagnostic scanner into your car to read the specific fault code and identify which part is failing.
  • Continuing to drive with the light on risks losing power steering information suddenly, which makes the car much harder to steer, especially at low speeds or while parking.

Common reasons the light turns on

A dead or dying battery is the most common cause. The electric power steering system draws power from your battery, and if voltage drops too low, the system cannot function properly and triggers the warning light. If your battery is old, corroded, or straightforward discharged, the light may come on even if nothing is wrong with the steering itself. Tightening a loose battery cable or replacing the battery often solves the problem.

A faulty steering angle sensor is the second most frequent culprit. This sensor tells the power steering computer where your steering wheel is pointing. If it fails or becomes misaligned — sometimes after a collision or rough pothole — the computer cannot calculate how much information to provide and shuts down the system. This sensor is usually located inside or near the steering column.

The electric power steering motor itself can fail. This motor does the actual work of assisting your steering. If its bearings wear out, its windings short, or its internal gears strip, the motor cannot turn and the light comes on. Motor failure is less common in newer cars but becomes more likely as the vehicle ages.

The power steering control module — the computer that runs the system — can also develop faults. Water intrusion, corrosion, or internal component failure can damage this module. Control module problems are harder to diagnose because the fault may be intermittent, causing the light to flicker on and off.

What happens when you drive with the light on

In most modern cars, the power steering system does not fail completely when the light comes on. Instead, the computer reduces or eliminates power information to protect the system from further damage. This means your steering wheel becomes much heavier and requires more physical effort to turn, especially at low speeds or when parking.

You can still steer the car, but it will feel like an older vehicle without power steering. At highway speeds, the difference is less noticeable because the car's momentum helps. At parking lot speeds or when making tight turns, you will feel a significant increase in effort. If the system fails completely while you are driving, you lose all information suddenly, which can be startling and dangerous if you are not prepared for it.

Driving a short distance to a mechanic is usually safe. Driving hundreds of miles or ignoring the light for weeks is not. The longer you drive with the light on, the greater the risk that the underlying problem worsens and causes a complete failure.

How a mechanic diagnoses the problem

A mechanic will connect a diagnostic scanner to your car's onboard computer port, usually located under the steering wheel or dashboard. This scanner reads the specific fault code stored in the power steering system's memory. The code tells the mechanic which part of the system is failing — the sensor, the motor, the wiring, or the control module.

The mechanic may also perform a visual inspection of the battery, battery cables, and steering column connectors to rule out straightforward problems like corrosion or loose connections. If the fault code points to the steering angle sensor, the mechanic may test it with a multimeter to confirm it is sending the correct signal. If the code points to the motor or control module, the mechanic may need to remove components to inspect them or test them under load.

Once the mechanic identifies the faulty part, they will explain what needs to be replaced and how much it will cost. Battery replacement is inexpensive. Sensor replacement usually costs between $200 and $500. Motor or control module replacement is more expensive and may cost $800 to $2,000 or more, depending on your car's make and model.

Steps to take when the light appears

First, check that your battery is in good condition. If your battery is more than three years old, corroded, or you have not had it tested recently, have it tested or replaced. A weak battery is the easiest and cheapest problem to fix, and it solves the warning light in many cases.

Second, do not ignore the light or assume it will go away on its own. The light will not turn off until the underlying problem is fixed. Some cars allow you to clear the fault code by disconnecting the battery for a few minutes, but this only hides the problem temporarily — the light will come back on the next time you drive.

Third, schedule an appointment with a mechanic within a few days. Bring your car in during daylight if possible, so the mechanic can test the system while it is fully charged. Tell the mechanic when the light first appeared and whether you noticed any change in how the steering feels.

Fourth, avoid driving the car long distances or in heavy traffic until it has been diagnosed. If you must drive it, do so at moderate speeds and avoid situations that require sudden steering inputs, like merging on a highway or parking in tight spaces.

When to pull over when ready

If the steering wheel suddenly becomes very hard to turn or if you lose steering information while driving, pull over to a safe location when ready. This is a sign that the power steering system has failed completely, not just triggered a warning light. Once you are safely stopped, call a tow truck rather than continuing to drive. A complete loss of power steering is a safety hazard, especially in traffic or at highway speeds.

If the warning light is on but the steering feels normal, you can drive to a mechanic, but do so carefully and avoid situations that demand quick steering adjustments. The light means the system has detected a problem, even if you cannot feel it yet.

Frequently Asked Questions

Can I drive with the electric power steering light on?

You can drive short distances to a mechanic, but not long distances or in heavy traffic. The light indicates a fault that could cause complete steering failure. Steering will feel heavier and require more effort, especially at low speeds. Have the car diagnosed within a few days.

Will the light turn off by itself?

No. The light will stay on until the underlying problem is fixed. Disconnecting the battery temporarily may clear the light, but it will return the next time you drive because the fault is still present. Only a mechanic repair fixes the problem permanently.

Is the electric power steering light the same as the check engine light?

No, they are separate warning lights. The check engine light signals problems in the engine, emissions, or transmission. The power steering light signals problems only in the steering system. Both lights require a diagnostic scanner to identify the specific fault.

What is the cheapest fix for this light?

A dead or weak battery is the cheapest and most common fix, usually costing $100 to $300. A faulty steering angle sensor costs $200 to $500. Motor or control module replacement is more expensive. A mechanic must diagnose the problem to know which part is failing.

Can a loose battery cable cause the power steering light?

Yes. A loose or corroded battery cable reduces the voltage the power steering system receives. Tightening the cable or cleaning corrosion from the terminals often solves the problem. Check the battery connections before assuming the steering system itself is faulty.