Symptom
Power steering warning light illuminated
A steering wheel symbol, usually with an exclamation mark beside it. On an electrically assisted system the module can withdraw assistance when it stops trusting one of its inputs, and it does so deliberately rather than because something has broken in the steering itself. The car remains steerable and does not become unsafe to stop — but it becomes very much heavier, and the change can arrive without warning at parking speed, which is where it is most likely to catch somebody out. Treat a light that comes and goes as more urgent than one that is simply on.
Also described as: power steering light, eps light, steering warning light, steering wheel symbol, steering light on, چراغ فرمان روشن شد, چراغ هیدرولیک فرمان, هشدار فرمان برقی, luz direccion asistida, testigo servodireccion, luz direccion roja, لمبة الباور ستيرنج, علامة عطل المقود, إشارة الدركسيون
What this usually means
On an electrically assisted system the module withdraws assistance deliberately when it stops trusting one of its inputs — it does not usually mean something in the steering has broken. The car remains steerable and does not become unsafe to stop, but it becomes very much heavier, and the change can arrive without warning at parking speed, which is where it is most likely to catch somebody out.
A lamp that comes and goes is more urgent than one that is simply on, because an intermittent loss of assistance is the version that surprises the driver mid-manoeuvre. A permanent loss is at least predictable.
Supply is the leading cause and it is worth checking before anything else, because an electric steering motor draws a large current at full lock and low speed. A tired battery, a poor earth or a failing alternator produces exactly this lamp, and it very often arrives alongside other unrelated warnings for the same reason. A steering lamp in a group of lamps is almost never a steering fault.
The steering angle and torque sensors are the other population. The angle reference is lost by a battery disconnection, a column or rack repair, an alignment on some vehicles, or a clock spring replacement — so a lamp that dates from any of that is a calibration rather than a part.
On a hydraulic system the questions are different: fluid level, belt, and the pump. A whine that rises with steering angle and heavy assistance at low speed is the classic hydraulic picture, and it does not apply to an electric car at all.
Working through it
| What you find | Likely cause | How to confirm it | What fixes it |
|---|---|---|---|
| Lamp with several other unrelated warnings | Low or unstable system voltage — the steering module draws heavily and is often the first to complain | Test the battery and charging system before diagnosing the steering at all. Read codes but do not act on them yet. | Repair the supply, clear the codes, re-scan. A steering lamp in a group is almost never a steering fault. |
| Appeared after a battery change, column, rack or alignment work | The steering angle reference has been lost — a calibration, not a component | Read live steering angle with the wheels straight ahead; a non-zero value is the finding. | Run the manufacturer's calibration. No part is required and none should be fitted. |
| Assistance comes and goes while driving | An intermittent connection or an overheating motor protecting itself | Log the fault against conditions — repeated full-lock manoeuvres heat the motor and some systems reduce assistance deliberately. Inspect the connector at the rack. | Repair the connection. Where it is thermal protection after heavy low-speed use, it is the system working. |
| Assistance heavy and constant, lamp steady, electric system | The motor, the torque sensor, or the module — assistance fully withdrawn | Read the steering module's own codes. Confirm supply and earth to the unit before condemning it. | Repair or renew as the codes name. Many racks are supplied as an assembly, which is a large cost difference from a sensor. |
| Hydraulic system, whine that rises with steering angle | Low fluid, air in the system, a failing pump, or a slipping belt | Check the fluid level and condition, and the belt and tensioner. Air produces foam in the reservoir, which is visible. | Top up and bleed, or renew the pump or belt. Find the leak rather than only topping up. |
| Lamp on a car with electric steering and no assistance at all from start-up | A fuse, the motor's main supply, or a module that has not initialised | Check the dedicated high-current fuse for the steering, which is separate from the ordinary fuse box on many vehicles. | Replace the fuse and find why it opened. A steering fuse rarely fails without a reason. |
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Lamp with several other unrelated warnings
- Likely cause
- Low or unstable system voltage — the steering module draws heavily and is often the first to complain
- How to confirm it
- Test the battery and charging system before diagnosing the steering at all. Read codes but do not act on them yet.
- What fixes it
- Repair the supply, clear the codes, re-scan. A steering lamp in a group is almost never a steering fault.
-
Appeared after a battery change, column, rack or alignment work
- Likely cause
- The steering angle reference has been lost — a calibration, not a component
- How to confirm it
- Read live steering angle with the wheels straight ahead; a non-zero value is the finding.
- What fixes it
- Run the manufacturer's calibration. No part is required and none should be fitted.
-
Assistance comes and goes while driving
- Likely cause
- An intermittent connection or an overheating motor protecting itself
- How to confirm it
- Log the fault against conditions — repeated full-lock manoeuvres heat the motor and some systems reduce assistance deliberately. Inspect the connector at the rack.
- What fixes it
- Repair the connection. Where it is thermal protection after heavy low-speed use, it is the system working.
-
Assistance heavy and constant, lamp steady, electric system
- Likely cause
- The motor, the torque sensor, or the module — assistance fully withdrawn
- How to confirm it
- Read the steering module's own codes. Confirm supply and earth to the unit before condemning it.
- What fixes it
- Repair or renew as the codes name. Many racks are supplied as an assembly, which is a large cost difference from a sensor.
-
Hydraulic system, whine that rises with steering angle
- Likely cause
- Low fluid, air in the system, a failing pump, or a slipping belt
- How to confirm it
- Check the fluid level and condition, and the belt and tensioner. Air produces foam in the reservoir, which is visible.
- What fixes it
- Top up and bleed, or renew the pump or belt. Find the leak rather than only topping up.
-
Lamp on a car with electric steering and no assistance at all from start-up
- Likely cause
- A fuse, the motor's main supply, or a module that has not initialised
- How to confirm it
- Check the dedicated high-current fuse for the steering, which is separate from the ordinary fuse box on many vehicles.
- What fixes it
- Replace the fuse and find why it opened. A steering fuse rarely fails without a reason.
Codes that produce this symptom (4)
Listed with the codes that most typically present this way first — the likeliest place to start.
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
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