What is an Electric Power Steering (EPS) Motor?
The electric motor that has replaced the old hydraulic pump on most modern cars.
Simplified animation — not to scale.
In plain English
Electric Power Steering replaces the engine-driven hydraulic pump with a compact electric motor — usually bolted onto the steering column or the steering rack itself. Almost every new car sold today uses EPS because it's lighter, more efficient, and lets the car add features like lane-keep assist and self-parking.
"Like the assist motor on an e-bike — you still steer, but a computer-controlled motor quietly does the heavy lifting."
How it works
Sensors measure how hard and how fast you're turning the steering wheel. The car's computer reads those inputs along with road speed, then tells the electric motor exactly how much extra assistance to add. At low speed (parking) it adds a lot; at motorway speed it backs off so the steering feels more stable. No hydraulic fluid, no belt-driven pump.
Signs of trouble
- ⚠Steering suddenly going heavy, often with a warning light
- ⚠EPS or power steering warning light on the dash
- ⚠Steering feel changing between drives (sometimes light, sometimes heavy)
- ⚠Whirring or buzzing noise from the column when turning
- ⚠Loss of lane-assist or self-parking features
£600–£1,700 fitted (often cheaper to fit a reconditioned unit)
Always get a written quote. Prices vary by car, region, and parts brand.