*By the AC Specialists at R & Y A/C Compressors | Family-owned and operated in Miami, FL since 1989 | Last updated: March 2026*
Quick Answer:
The five key warning signs of a failing electric power steering pump are: the EPS warning light illuminating, heavy or stiff steering (especially at low speeds), unusual whining or grinding noises when turning, intermittent loss of steering assist, and fluid leaks (on electro-hydraulic systems). Address these symptoms promptly — a complete failure can compromise your ability to make emergency steering maneuvers.
Your power steering system is one of those things you never think about until it stops working. When it does fail, you notice immediately. The steering wheel becomes difficult to turn, strange noises appear, or a warning light shows up on your dash out of nowhere.
Electric power steering (EPS) systems are generally more reliable than their hydraulic predecessors, but they are not immune to problems. Whether your vehicle uses a fully electric system or an electro-hydraulic power steering (EHPS) pump, knowing the warning signs of failure can save you from an expensive breakdown or, worse, a dangerous situation on the road.
Here are the five most common symptoms that your electric power steering pump is on its way out, along with what you should do about each one.
1. The Power Steering Warning Light Is On
This is the most obvious sign, and it is the one that too many drivers ignore. When the EPS warning light illuminates on your dashboard, the system’s electronic control unit has detected a fault. It might look like a steering wheel icon, sometimes with an exclamation mark beside it.
What It Means
The warning light can indicate a range of issues:
- A faulty torque sensor that can no longer accurately read your steering input
- An electrical problem with the EPS motor itself
- A failing control module or corrupted software
- A blown fuse or damaged wiring harness
- Low voltage from the battery or charging system affecting EPS performance
What to Do
Do not assume the light will go away on its own. In some cases, the system may enter a reduced-assist mode or shut off entirely. Start by checking your battery voltage and connections, since low voltage is one of the most common triggers for EPS warning lights. If the battery and charging system check out fine, have the system scanned for diagnostic trouble codes (DTCs). Common codes include C0545, C1554, and U0131, depending on the manufacturer.
2. Heavy or Stiff Steering
If your steering wheel suddenly requires much more effort to turn, especially at low speeds or when parking, your electric power steering system is likely not providing full assist. This is the symptom that gets your attention fastest because the change in effort is so dramatic.
What It Means
Heavy steering from an EPS failure can result from:
- Motor failure: The electric motor that provides steering assist has worn out or burned out.
- Torque sensor malfunction: If the sensor cannot read your steering input accurately, the control module does not know how much assist to provide.
- Electrical connection issues: Corroded connectors, damaged wiring, or a poor ground connection can interrupt power to the motor.
- Control module failure: The ECU that manages the system may have failed or lost its calibration.
- Low battery voltage: EPS systems draw significant electrical current. A weak battery or failing alternator may not supply enough power, especially during high-demand situations like parking lot maneuvers.
What to Do
First, check whether the problem is consistent or intermittent. If the steering is always heavy, the motor or control module is likely the cause. If it comes and goes, suspect an electrical connection issue or a borderline battery. Have your battery tested under load. A battery that reads 12.4 volts at rest may still fail under the electrical demands of the EPS system.
For EHPS systems specifically, heavy steering can also indicate a failing electric pump motor that can no longer build adequate hydraulic pressure.
3. Unusual Noises When Turning the Wheel
A healthy power steering system operates quietly. If you start hearing whining, grinding, humming, or clicking noises when you turn the steering wheel, something is wrong.
What Each Noise Might Indicate
- Whining or humming that increases with steering effort: In EHPS systems, this often points to a failing pump motor or low fluid level. In fully electric systems, it may indicate a motor bearing that is wearing out.
- Grinding or scraping: This typically suggests internal mechanical wear in the motor, steering column, or intermediate shaft. It can also indicate a problem with the motor coupling.
- Clicking or popping during turns: While this can be related to CV joints or tie rod ends, it can also come from a worn EPS motor or mounting bracket that allows the motor to shift under load.
- Buzzing from under the dash: Column-assist EPS systems mount the motor on the steering column inside the cabin. A buzzing sound from this area usually means the motor is struggling or has a failing component.
What to Do
Try to identify where the noise is coming from. Column-assist systems will produce noise from inside the cabin near the steering column. Rack-assist systems will generate noise from the engine bay near the steering rack. For EHPS systems, check the fluid level and condition first. Dark or foamy fluid needs to be flushed and replaced. If the fluid is fine, the pump motor itself is likely the issue.
Do not ignore steering noises. They almost always get worse over time, and a complete failure could leave you without power assist at the worst possible moment.
4. Intermittent Steering Assist
This might be the most unsettling symptom on the list. The power steering works normally for a while, then suddenly cuts out, then comes back again. You might feel the steering go heavy in the middle of a turn, only to have assist return a few seconds later.
What It Means
Intermittent assist loss usually points to an electrical problem rather than a complete mechanical failure:
- Loose or corroded electrical connections: Vibration and heat cycling can loosen connectors over time, creating intermittent contact. Road salt and moisture accelerate corrosion, especially on vehicles in northern climates.
- Failing EPS relay or fuse: A relay that is starting to fail may work sometimes and not others, especially when hot.
- Overheating motor: If the EPS motor is being overworked, such as during repeated parking maneuvers on a hot day, it may have a thermal protection circuit that temporarily shuts it down to prevent damage.
- Intermittent torque sensor signal: A torque sensor with a failing internal connection can send erratic signals, causing the control module to fluctuate between assist and no assist.
- Battery voltage drops: If your alternator is weak or your battery is on its last legs, voltage dips during high electrical demand can cause the EPS to cut out momentarily.
What to Do
Pay attention to the conditions when the assist cuts out. Does it happen more often when the car is hot? When you are driving over bumps? When you have other electrical accessories running? This information helps narrow down the cause.
Have the wiring harness and connectors inspected for corrosion, especially at the motor connector and the ECU connector. A voltage drop test on the EPS circuit can reveal a bad ground or high-resistance connection that is starving the motor of power.
5. Fluid Leaks (Electro-Hydraulic Systems)
This symptom applies specifically to vehicles with electro-hydraulic power steering (EHPS) systems, which use an electric motor to drive a hydraulic pump. If you spot reddish or amber fluid under the front of your vehicle, or if the power steering fluid reservoir keeps dropping, you have a leak that needs attention.
Common Leak Points in EHPS Systems
- High-pressure hose connections: The fittings where hoses connect to the pump and steering rack are common leak locations, especially as O-rings age and harden.
- Pump shaft seal: The seal where the motor shaft enters the hydraulic pump can wear over time and allow fluid to seep out.
- Steering rack seals: The internal seals in the steering rack can deteriorate, allowing fluid to leak from the boots at either end of the rack.
- Fluid reservoir cracks: The plastic reservoir can develop cracks from age, heat exposure, or physical damage.
What to Do
Check the fluid level in the power steering reservoir. If it is low, top it off with the correct fluid specified in your owner’s manual (not all power steering fluids are the same). Then inspect the system for leaks. Look for wet spots on hoses, connections, and the pump housing. A UV dye kit can help locate slow leaks that are not immediately visible.
Running an EHPS system with low fluid will accelerate pump wear and can cause the motor to overheat. Address leaks promptly to avoid turning a minor repair into a major one.
What Happens If You Keep Driving with a Failing EPS Pump?
Driving with a compromised power steering system is possible but risky. Here is what can happen if you put off repairs:
- Complete loss of assist: What starts as intermittent can become permanent. You will still be able to steer, but it will require significant physical effort, especially at low speeds.
- Increased tire wear: Struggling to steer precisely leads to uneven tire wear and poor alignment over time.
- Secondary electrical damage: A failing EPS motor can draw excessive current, potentially damaging fuses, relays, or even the vehicle’s electrical system.
- Safety risk: Emergency steering maneuvers require quick, precise inputs. Without power assist, your ability to avoid a hazard is compromised.
Diagnosing EPS Problems: Where to Start
If you are experiencing any of these symptoms, here is a practical diagnostic sequence:
- Check the battery. Have it load-tested. A battery showing 12.2 volts or less under load is a prime suspect for EPS issues.
- Scan for codes. Use an OBD-II scanner that can read chassis and body codes, not just engine codes. Many generic scanners cannot access EPS fault codes.
- Inspect wiring and connectors. Look for corrosion, damaged insulation, and loose connections at the motor, torque sensor, and ECU.
- Check the fuse and relay. The EPS system has its own fuse (often a high-amperage fuse in the underhood fuse box). Make sure it is intact and the relay is functioning.
- Test the motor. A qualified technician can measure the motor’s resistance and current draw to determine if it is within specification.
Frequently Asked Questions
The EPS warning light typically looks like a steering wheel icon, sometimes with an exclamation mark or the letters “EPS” or “PS.” On some vehicles it may be orange/amber (caution) or red (immediate attention needed). Any version of this light means the system has detected a fault that should be diagnosed promptly.
Electric power steering motors are designed to last the life of the vehicle and often exceed 150,000 miles without issue. When they do fail, the cause is typically electrical (corroded connectors, failed relay, weak battery) rather than the motor itself wearing out. EHPS pumps with hydraulic components may need replacement sooner, typically after 100,000–150,000 miles.
Yes. A weak or failing battery is one of the most common triggers for EPS warning lights and intermittent steering assist loss. EPS motors draw high current, especially during low-speed parking. A battery that tests borderline at rest may fail under this demand, causing the EPS to cut out or throw fault codes.
You can drive with heavy power steering, but it is not ideal and becomes a safety concern in emergency situations where quick steering inputs are needed. The vehicle remains steerable without power assist, but requires significantly more physical effort, especially at low speeds. Get the system diagnosed as soon as possible.
Intermittent EPS issues are usually electrical. Start by having the battery load-tested and inspecting the wiring harness and connectors at the EPS motor, torque sensor, and ECU. A voltage drop test can identify high-resistance connections. Have the system scanned for fault codes even if the warning light is not currently on — intermittent codes are often stored in memory.
EHPS pump replacement is similar to a hydraulic pump swap and is DIY-friendly for experienced mechanics with basic tools. Fully electric column or rack-mounted motor replacement is more involved, often requiring steering column disassembly and potentially scan tool programming to calibrate the new unit to the vehicle. If you are unsure, consult a professional.
Depending on the vehicle, an EPS pump or motor replacement costs $550–$1,700 including parts and labor. EHPS pumps tend to be on the lower end. Column or rack-mounted EPS motors, particularly on luxury vehicles or trucks, can reach the higher end, especially when programming is required.
Find Your Replacement EPS Pump at R & Y A/C Compressors
If your diagnosis points to a failed electric power steering pump, R & Y A/C Compressors carries quality replacement units for a wide range of vehicles. Based in Miami and serving customers since 1989, we offer tested and reliable EPS pumps that meet OE specifications. Visit rycompressors.com to search by your year, make, and model, or contact our team for help finding the right part for your vehicle.