Power Steering Warning Light: What It Means and What to Do
The power steering warning light (often a steering wheel with an exclamation mark, or the letters EPS) means the system that makes your steering feel light has a fault. On modern cars with electric power steering (EPS), it usually points to an electrical, sensor, or control-module issue; on older hydraulic systems it's commonly low or leaking fluid. When it's on, the steering can suddenly become heavy and require much more effort, especially at low speeds and during parking.
Trouble codes you may see
If you scan the car, these are the OBD-II codes most often behind this symptom:
Common causes
- 1
Electrical or charging fault (EPS)
Electric power steering draws heavy current. A weak battery, failing alternator, or poor connection can drop voltage and disable assist, lighting the EPS warning.
- 2
Steering angle or torque sensor fault
EPS relies on torque and steering-angle sensors. If a sensor sends an implausible signal, the module shuts off assist for safety and stores a chassis (C-series) code.
- 3
EPS control module or motor failure
The steering control unit or the assist motor itself can fail, fully disabling power assist until repaired. This is common as cars age.
- 4
Low or leaking power steering fluid (hydraulic systems)
On hydraulic setups, low fluid from a leak in a hose, the pump, or the rack is the most common cause and makes steering whine and stiffen.
- 5
Failing power steering pump or belt
A worn hydraulic pump, or a loose/broken serpentine belt driving it, reduces assist and can trigger the warning along with a noise.
- 6
Blown fuse or wiring fault
A blown EPS fuse or damaged/corroded wiring can cut power to the system intermittently or completely.
What to do
The car remains drivable but the steering may become much heavier, so reduce speed and avoid highways and tight maneuvers until it's checked. On a hydraulic system, check the power steering fluid level first; on EPS, try a key-off/key-on restart, which sometimes resets a temporary fault. Because losing assist at speed or mid-turn is a real safety risk, have it diagnosed promptly rather than driving on it for days.
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