Electric Power Steering System Warning Light: What It Means & What We Should Do

When the dashboard suddenly lights up with the electric power steering system warning light, it’s a clear sign that the vehicle’s steering assistance system needs attention. Below, we’ll walk through what that warning means, why it happens, and how you should respond.

What is the Electric Power Steering System Warning Light?

The electric power steering system (commonly abbreviated EPS) uses electric motors and sensors instead of a traditional hydraulic pump to assist your steering.
When the warning light for the electric power steering system appears, it typically means the system has detected a fault, reduced performance or a component failure.
The symbol is often a steering wheel icon with an exclamation mark.

Common Causes of the Warning Light

Here are some of the main reasons the electric power steering system warning light might illuminate:

1. Electrical or sensor fault – Since EPS relies heavily on sensors (steering angle, torque sensors) and the control unit, any malfunction in wiring, sensor or module can trigger the warning.
2. Low voltage or battery/charging issues – Insufficient power to the electric motor means the EPS cannot perform properly, potentially causing the warning light to come on.
3. Mechanical overload or assistance failure – Even though it’s electric, elements like the steering column, motor, or gear may be stressed or failing, leading to loss of assist and the warning light.
4. Hydraulic-system confusion in hybrid setups – In some vehicles with hybrid systems, if the traditional power steering system fluid is improperly checked or a version of assist remains, then you may see complications when EPS takes over. (Note: modern EPS usually no fluid.)

Why We Should Not Ignore It

Seeing the electric power steering system warning light isn’t just inconvenient—it can be a safety risk. Features include:

• Steering effort may dramatically increase (especially at low speeds or while parking) when assist is lost.
• The vehicle’s handling characteristics may change unexpectedly.
• A warning light may presage further damage or breakdown if left unchecked.
  Thus, prompt diagnosis and repair are strongly advised.

What to Do When the Warning Light Comes On

Here’s a sensible step-by-step action plan:

1. Drive cautiously – If the light comes on while you’re driving, slow down and avoid abrupt steering manoeuvres. While you may still be able to drive, the steering may feel heavier or less predictable.
2. Check for obvious issues – Make sure the battery/charging system seems fine. If your car has a hybrid component, check for other warning lights that might indicate a broader electrical problem.
3. Visit a qualified technician as soon as possible – Have a diagnostics scan performed on the EPS module and related sensors. The issue may be as simple as a sensor fault, but could also require motor or wiring repair.
4. Avoid further load – Until fixed, avoid driving in very tight parking situations or high-speed steering heavy manoeuvres, because assist may fail entirely under load.
5. Follow up with preventative checks – After repair, keep an eye on any changes in steering feel, unusual noises, or irregular warning lights.

Preventative Maintenance Tips

To help minimise chances of the electric power steering system warning light coming on again:

• Ensure the vehicle’s battery and charging system are maintained — EPS systems are sensitive to voltage fluctuations.
• Listen for unusual sounds when turning the wheel (grinding, whines, heavy effort) and have them checked early.
• After any major repair or electrical work, have the EPS system checked for proper calibration of the steering angle sensor and other inputs.
• Refer to your vehicle’s maintenance schedule and follow any manufacturer-recommended EPS diagnostics or updates.