What is the power steering system warning on a Toyota Corolla?

The power steering system warning in a Toyota Corolla points to a fault in the electronic power steering (EPS) system. It can make steering feel heavier or unassisted, and it should be diagnosed by a qualified technician as soon as possible.

Modern Corollas rely on electric power steering instead of a hydraulic pump. When the EPS detects a fault, the warning light or message on the dash alerts the driver, and in some cases the system may revert to manual steering with reduced or no assist. This article explains what the warning means, why it happens, and what actions to take.

What the warning means and how it appears

Dash indicators to look for

When the warning appears, you might notice one or more of these indicators on the dashboard:

• Steering wheel icon with an exclamation mark or the words "Power Steering" or "EPS" illuminated


• Reduced or lost steering assist, especially at low speeds


• A direct message such as "Steering Assist Fault," "EPS Malfunction," or "Steering System Malfunction"


• In some cases, simultaneous warning lights such as ABS or Check Engine may appear

These indicators mean the EPS has detected a fault or is not receiving proper power or data from sensors, and service is required.

How the electronic power steering (EPS) works in the Corolla

Core components

EPS uses an electric motor mounted on the steering system to provide assist. A steering angle sensor, torque sensor, and the EPS control module coordinate to adjust the level of assist based on speed and steering input. The system draws power from the vehicle’s 12‑volt electrical system and relies on reliable wiring and sensors to function correctly.

Why the warning can come on

The EPS warning can trigger for several reasons, including a drop in battery voltage, a faulty motor or sensor, damaged wiring or connectors, a blown fuse, or a fault in the EPS control module. CAN bus communication issues with other modules can also set the warning.

Common causes of the EPS warning

Electrical and sensor issues

These problems affect the EPS’s ability to sense and respond to driver input:

• Low or unstable battery voltage or charging faults


• Faulty EPS motor or actuator


• Steering angle sensor or torque sensor failure


• Damaged or corroded wiring/connectors in the steering column or dash area


• Blown fuse or faulty EPS control module

Diagnosing these issues typically requires a diagnostic scan and inspection of the steering system by a trained technician.

Mechanical and calibration issues

Wear or damage can affect the system’s calibration and mechanical operation:

• Steering column damage or excessive play in components


• Miscalibration of the steering angle sensor


• Recent impact or collision damage to the steering system

Calibration or replacement may be necessary, and a professional will confirm proper alignment and sensor data.

What to do if the warning light comes on

If you see the EPS warning, take prudent steps to stay safe and get the system checked promptly:

1. Safely pull over and park as soon as practicable; avoid abrupt maneuvers.


2. Turn the engine off, then restart and gently test the steering at low speed. If the light remains on or steering feels wrong, stop and do not continue driving far.


3. Check for other warning lights and listen for abnormal noises from the steering system or steering column.


4. Ensure the battery and charging system are functioning; a weak battery can affect EPS performance.


5. Have the vehicle inspected by a Toyota dealer or qualified mechanic who can run a diagnostic scan of the EPS system, including the motor, sensors, and wiring.

Persistent EPS warnings should be treated as a safety issue. Do not rely on the vehicle for long trips until it has been diagnosed and repaired.

What to expect at the repair shop

At a service visit, technicians will typically:

• Retrieve EPS fault codes with a scan tool and inspect related sensors and wiring


• Test the EPS motor and steering angle sensor for proper operation and calibration


• Check the battery voltage and charging system to rule out power supply issues


• Inspect fuses and the EPS control module for faults or required updates


• Perform any needed repairs, re-calibration, or replacements, and recheck the system

In some cases, software updates or ECU reprogramming may be required, and in others, a faulty motor or sensor will need replacement by a trained technician.

Summary

The power steering system warning on a Toyota Corolla signals a fault in the electronic power steering system. It can reduce or remove steering assist and may involve the EPS motor, steering angle sensor, wiring, or the battery/charging system. If the warning appears, drive cautiously to a safe location and have the system diagnosed quickly by a qualified technician to restore reliable steering and avoid potential safety risks on the road.

Can I add power steering fluid myself?

Yes, you can add power steering fluid yourself if the level is low, but you must use the correct type of fluid specified in your vehicle's owner's manual and check for any leaks. You can add the fluid yourself by locating the power steering reservoir, using a funnel to pour in the fluid in small amounts until it reaches the "full" line, and then replacing the cap. If the fluid is low, it's important to check for and repair any leaks to prevent further damage. 
You can watch this video to see a quick and easy demonstration of how to add power steering fluid: 1mChrisFixYouTube · May 8, 2014
Steps to add power steering fluid

1. Consult your owner's manual: Find out what type of power steering fluid your car requires and check the correct fill level (hot or cold). 
2. Locate the reservoir: Find the power steering fluid reservoir under the hood. It's often labeled with a steering wheel icon. 
3. Check the level: Use the dipstick attached to the reservoir cap to check the fluid level. 
4. Add the fluid: If the level is low, remove the cap and use a funnel to slowly add the correct fluid in small increments, checking the level after each addition to avoid overfilling. 
5. Replace the cap: Once the fluid is at the proper level, secure the cap tightly to prevent leaks. 
6. Test your car: Take a short test drive and listen for any unusual noises like whining, which could indicate air in the system or a leak. 

This video demonstrates the entire process of changing power steering fluid, including bleeding the system: 1mBudget MechanicYouTube · Aug 20, 2021
Important considerations

• Use the right fluid: Using the wrong type of fluid can damage your power steering system. 
• Check for leaks: If you have to add fluid frequently, there is likely a leak that needs to be repaired. 
• Don't overfill: Overfilling can cause the fluid to expand and leak out of the reservoir. 
• Consider a full fluid exchange: If the fluid is dark or dirty, a full fluid exchange may be necessary to prevent damage to the pump and steering rack. 

This video shows how to perform a full power steering fluid flush without a pump: 1mChrisFixYouTube · May 1, 2014

Can I drive with the power steering warning light on?

It is not safe to drive with the power steering light on, as it can lead to a complete loss of steering assistance and is a sign of a serious problem. While you may be able to drive, it will be significantly harder to steer, which increases the risk of an accident, especially during emergency maneuvers or low-speed turns. You should pull over to a safe location immediately and have the vehicle inspected by a professional mechanic. 
This video explains the meaning of the power steering warning light and what to do when it appears: 54sCar ManufacturingYouTube · Apr 10, 2025
What to do when the light is on

• Pull over to a safe spot: Park your car as soon as it is safe to do so. 
• Check the steering fluid: If your car has a hydraulic system, check the power steering fluid level and top it off if it is low. Be aware that a low fluid level often indicates a leak that needs to be fixed. 
• Restart the car: For electric power steering (EPS) systems, a simple reset by turning the car off and on may solve the issue. If the light remains on, the problem is more serious. 
• Get it inspected: If the light persists or if you have a hydraulic system, do not drive the vehicle further than is necessary to get to a repair shop. 
• Avoid high speeds: If you must drive, do so with extreme caution and avoid highways and high speeds. 

Why it's dangerous

• Loss of steering assistance: The warning light signals a problem that can make the steering wheel much harder to turn, requiring more physical effort. 
• Risk of sudden failure: A hydraulic system can experience sudden failure due to low fluid or a broken pump, making steering impossible. 
• Increased accident risk: The difficulty in steering can make it hard to react quickly to obstacles or make sharp turns, increasing the likelihood of a crash. 
• Potential for further damage: Driving with a power steering issue can cause further damage to the pump or other components. 

What is the electric power steering system warning light on a Toyota Corolla?

A Toyota Corolla's electric power steering (EPS) warning light indicates a malfunction in the steering system, which could range from a simple sensor glitch to a more serious issue with the motor or electrical system. It is recommended to pull over safely, turn off the vehicle, and then restart it; if the light remains on, drive with caution and have a professional inspect the car immediately. Ignoring the light can lead to increased steering effort and a risk of losing power steering assistance.
 
This video explains the possible causes of the power steering warning light: 59sCar ManufacturingYouTube · Apr 10, 2025
What to do

• Pull over safely: As soon as it is safe, stop the car.
• Turn off the engine: Turn the vehicle off completely.
• Restart the car: Wait about 30 seconds, then restart the engine.
• If the light remains on: The problem is likely more significant. Drive cautiously and have the vehicle inspected by a qualified mechanic as soon as possible, as you may experience difficulty turning the steering wheel. 

Possible causes

• Electrical issues: Faulty wiring, a weak battery, or a failing alternator can cause voltage drops that trigger the light. 
• Sensor or computer glitches: The torque sensor, which measures steering input, can cause the warning light to come on if it's not calibrated correctly. A simple recalibration may fix this. 
• Steering motor or EPS module failure: The electric motor or the control module itself could have a fault. 
• Wiring and fuse issues: A blown fuse or loose connection in the EPS system wiring can cause a problem. 

This video demonstrates how to troubleshoot and reset the power steering warning light: 58sDashboard warning lights YouTube · Feb 4, 2025
What to do before driving

• If the light comes on, pull over and turn off the engine. If the light turns off after you restart, it may have been a temporary glitch. If it stays on, proceed with caution and get the car checked by a professional. 
• If the warning light is accompanied by a battery warning light, a technician should first check the battery and alternator to ensure they are working correctly. 
• If your Corolla uses a hydraulic system, a low power steering fluid level could be the cause, but if it's an electric system, there is no fluid to check. 

How much does it cost to fix power steering on a Toyota Corolla?

The average cost for a Toyota Corolla Power Steering Hose Replacement is between $957 and $1,040. Labor costs are estimated between $179 and $263 while parts are typically priced around $777. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.