Parts for your 2018 Toyota Prius-Power steering pump

2018 Toyota Prius power-steering-pump — what’s actually fitted?

There’s no hydraulic power-steering pump on a 2018 Toyota Prius. Technical sources including Toyota’s 2018 Prius Owner’s Manual (Electric Power Steering section), the Toyota Repair Manual (Power Steering System – EPS), and the Toyota New Car Features (ZVW50 series) confirm the Prius uses an Electric Power Steering (EPS) system. EPS replaces the traditional belt‑driven hydraulic pump and fluid with an electric motor and an EPS control unit, mounted to the steering column/rack.

That means a “power-steering-pump” isn’t relevant to this model, and there’s no power steering fluid reservoir to check under the bonnet.

Why Toyota doesn’t use a pump on this Prius:

• Better efficiency and fuel economy: No belt-driven pump dragging on the engine, which suits hybrid driving and saves petrol.
• Lower maintenance: No hydraulic fluid, hoses, or seals to leak, and no pump to wear out.
• Smarter steering feel: EPS provides variable assist by software, adapting to speed and driving conditions.
• Safety system integration: Plays nicely with driver-assist features such as Lane Departure Alert with Steering Assist.
• Quiet and compact: Less noise and simpler packaging up front.

Servicing guidance for owners and workshops:

• There’s no power steering fluid to check or change on a 2018 Prius.
• EPS depends on stable 12‑volt supply. If the steering feels heavy at low speeds or the EPS warning light appears, check the 12‑volt battery condition and charging system first.
• If the EPS light comes on, scan for steering-related DTCs before replacing parts. The EPS motor and control unit are diagnostic‑driven components.
• Keep tyres correctly inflated and aligned. Incorrect toe or worn front suspension/steering joints can mimic steering issues.
• After front-end or steering work, perform a wheel alignment and, if required by the repair manual, a steering angle neutral position calibration.

According to Toyota’s factory literature, normal service on this Prius does not include any “power-steering-pump” replacement or maintenance, because the part simply isn’t fitted. If steering assistance is lost or intermittent, diagnosis should focus on the EPS system, column/rack, steering angle/torque sensors, wiring, and vehicle power supply rather than any hydraulic components.

Does the 2018 Prius have a power steering pump or fluid?

No. It uses Electric Power Steering (EPS), so there’s no hydraulic pump or fluid to service. Steering assist comes from an electric motor controlled by the EPS ECU.

What should be serviced instead of a power steering pump on a 2018 Prius?

Focus on tyre pressures and alignment, front-end wear (ball joints, tie-rod ends, rack boots), and the 12‑volt battery’s health. If an EPS warning appears, have the system scanned and follow Toyota’s diagnostic steps.

How can someone tell if the EPS is playing up on a 2018 Prius?

Watch for an EPS warning light, unusually heavy steering at low speed, or assistance that cuts in and out. Start with a battery/charging check, then scan for fault codes to pinpoint whether it’s a sensor, wiring, or the EPS unit itself.