The EPS light signals a fault in the electric power steering system or its electrical supply. Common causes include a faulty sensor, a failing motor or wiring, and low battery voltage. If the warning remains lit, have the system diagnosed promptly, as steering assist may be reduced or lost.
What is electric power steering and why the warning matters
Electric power steering (EPS) uses an electric motor to assist steering, controlled by sensors and a central control module. A fault detected by the system can cause reduced or no assist, making steering heavier—especially at low speeds—and can affect vehicle control. The warning light is designed to prompt a check before a potential safety risk arises.
Common causes of an EPS warning
Below are the frequent culprits identified by manufacturers and technicians when the EPS warning appears.
- Faulty steering angle sensor or torque sensor that sends position and force data to the EPS controller
- Malfunctioning EPS motor or wiring harness leading to intermittent or no assist
- Low battery voltage or charging problems that deprive the EPS of stable power
- Blown fuse or faulty relay in the EPS electrical circuit
- Mechanical issues in the steering rack or column, such as binding or wear
- Software fault or outdated calibration in the EPS control module
These issues can be intermittent or persistent. A technician will typically retrieve fault codes and test the electrical supply and sensors to identify the root cause.
What to do if the EPS light appears
When the warning comes on, take a cautious approach to preserve steering control and minimize risk.
- Check for accompanying messages on the dashboard and note when the light comes on (start-up vs. during driving)
- If the steering feels unusually heavy or stiff, stop and seek service rather than continuing to drive
- Test the battery and charging system; weak voltage can trigger EPS faults, so have the battery checked if the vehicle is slow to start or the light remains after a jump
- Use an OBD-II scanner or have a shop read EPS-specific fault codes to identify likely sensors or modules involved
- Inspect fuses and relays for the EPS circuit as described in the owner's manual
Even if the light goes out after a restart, the underlying issue may persist. Do not ignore the warning, and arrange a professional diagnosis as soon as possible. A faulty EPS can lead to sudden changes in steering effort, increasing the risk of a crash.
When to seek immediate help
In some cases, the EPS fault is accompanied by other warning lights (such as ABS or stability control) or the steering becomes completely unassisted. If you experience a sudden loss of power assist while driving, pull over safely and call for roadside assistance.
Summary
The EPS light is a safety warning that points to faults in the electric power steering system or its electrical supply. Common causes include sensor or motor problems, wiring faults, and low battery voltage. If the light is on, have the system diagnosed with a code reader and tested by a qualified technician. Driving with questionable EPS can be unsafe, and repairs may range from fuse replacement to sensor or motor replacement depending on the diagnosis.