Honda Electric Power Steering (EPS) Light Illuminating: Causes and Diagnostic Codes
You’re driving along, and suddenly a warning light shaped like a steering wheel with an exclamation point pops up on your dash. The steering feels heavier, and you’re left wondering if you should pull over immediately.
Here’s the thing about Honda’s Electric Power Steering system—it’s actually pretty smart and reliable, but when something goes wrong, it’s not always obvious what’s happening under the hood. Unlike old hydraulic systems that used fluid and pumps, EPS relies on an electric motor and sensors to make steering feel light and responsive at low speeds while staying stable on the highway. Understanding what that warning light means can save you time, money, and a lot of unnecessary worry.
TL;DR
The Honda EPS warning light means your Electric Power Steering system has detected a problem and may reduce assist to prevent further issues. Common causes include low battery voltage, faulty connections, sensor failures, or problems with the EPS control unit. Diagnostic trouble codes (DTCs) like 32-01, 34-05, 35-01, and others pinpoint specific faults. Most EPS issues can be diagnosed with a scan tool at a shop, and some problems—like loose wiring or simple electrical glitches—may be fixable without expensive repairs.
Key Takeaways
- The EPS light comes on when the system detects a fault and reduces or removes power assist to protect itself
- Common causes include low battery voltage, poor electrical connections, damaged sensors, or control unit failures
- Diagnostic codes like 32-xx, 34-xx, 35-xx, and others tell technicians exactly what’s wrong
- The system often limits assist when it detects a problem, making steering feel heavy at low speeds but manageable at highway speeds
- Professional diagnosis with a Honda HDS scanner is the most reliable way to pinpoint the issue, though some DIY checks can help
Why the EPS Light Turns On
The EPS light is your car’s way of saying, “Something isn’t right with the steering assist.” Unlike a check engine light that might stay on for minor issues, the EPS light typically illuminates when the system has actually reduced or disabled power assist to protect itself or you.
How EPS Works in Your Honda
Honda’s Electric Power Steering system uses a compact electric motor mounted on the steering column (in most models) to help you turn the wheel . The system relies on:
- A torque sensor that detects how hard you’re turning the wheel
- A speed sensor that tells the system how fast you’re going
- An EPS control unit that decides how much assist to provide
- The electric motor that actually applies the assist
There’s no power steering fluid to check or change—EPS is entirely electrical . This means maintenance is simpler, but issues can be trickier to diagnose without the right tools.
What Causes the EPS Light to Come On?
Electrical System Problems
EPS is sensitive to voltage. A weak battery, failing alternator, or poor ground connection can trigger the EPS light and reduce assist . This often happens in older vehicles where the battery isn’t holding a charge well, or after jump-starting a dead battery.
The Ridgeline’s In-Bed Trunk® might be great for tailgating, but your EPS system doesn’t care about tailgate parties—it just wants clean, stable voltage to function properly.
Wiring and Connection Issues
Loose, corroded, or damaged wiring connections are surprisingly common causes . One Honda Freed owner tracked down a steering issue to a faulty plug connection that cost just €95 to repair at a workshop . Similarly, a Honda Insight owner found that corroded pins in the EPS module connector were causing intermittent problems .
Physical impacts like hitting a pothole can sometimes dislodge a wire from the EPS controller . When a 1998 Accord driver hit a hole and the EPS light came on, a mechanic suggested checking for loose wiring around the steering column .
Sensor Failures
The torque sensor is a critical component—it tells the system how much you’re turning the wheel. If this sensor fails or gives incorrect readings, the EPS light will come on and steering will feel heavy . Some owners have reported replacing the torque sensor multiple times only to find the issue persisted due to wiring problems.
Motor Overheating
EPS motors can overheat if you’re constantly turning the wheel quickly at low speeds, especially in tight parking situations or with oversized wheels. The system is designed to protect itself by temporarily reducing assist when it gets too hot . If you drive on rough terrain or park with the wheels turned aggressively, the motor can overheat and trigger the warning.
Control Unit (ECU) Failure
The EPS control unit itself can fail. Honda service manuals list multiple diagnostic codes that indicate internal circuit failures in the control unit, such as code 32-01 (current sensor circuit), code 35-01 (CPU circuit), and code 35-02 (EEPROM circuit) .
Understanding EPS Diagnostic Codes
When you take your Honda to a shop, technicians use a Honda Diagnostic System (HDS) scanner to read codes stored in the EPS control unit . Here’s what some of the most common codes mean:
| Code | What It Means |
|---|---|
| 32-01 | EPS Control Unit Internal Circuit (Current Sensor) |
| 32-02 | EPS Control Unit Internal Circuit (Current Sensor Offset) |
| 34-01 | Power Relay Circuit Malfunction |
| 34-05 | Power Relay Stuck OFF |
| 35-01 | EPS Control Unit Internal Circuit (CPU) |
| 35-02 | EPS Control Unit Internal Circuit (EEPROM) |
| 35-04 | EPS Control Unit Internal Circuit (CPU Communication) |
| 35-06 | EPS Control Unit Internal Circuit (ITN Communication) |
| 35-07 | EPS Control Unit Internal Circuit (INHL/INHR Ports) |
| 36-02 | EPS Control Unit Internal Circuit (INH Output Circuit) |
| 37-01 | EPS Control Unit Internal Circuit (Step-up Circuit) |
| 39-01 | EPS Control Unit Internal Circuit |
| 39-02 | EPS Control Unit Internal Circuit |
“EPS is sensitive to voltage, a failing battery or alternator can set the light and reduce assist.”
What to Do When the EPS Light Comes On
Immediate Steps
- Check your battery. Since EPS is sensitive to voltage, the easiest first step is making sure your battery isn’t weak . If your battery is more than 3-4 years old, it might be time for a replacement.
- Look for obvious wiring issues. Check around the steering column for any loose or damaged wiring, especially if the problem started after hitting a bump or pothole .
- Don’t panic about driving. EPS failure typically means you lose power assist, not steering entirely. The steering will feel heavy, like driving an older car without power steering, but the mechanical connection is still intact. At highway speeds, the difference is often barely noticeable because you need less assist at speed.
- Have it diagnosed properly. A shop with a Honda HDS scanner can read the specific diagnostic trouble code (DTC) that will tell them exactly what’s wrong .
DIY Reset Procedures
Some EPS codes can be cleared, but don’t expect this to fix a real problem. If the underlying issue remains, the light will come back.
Battery Disconnect Method :
- Disconnect the negative battery cable
- Wait 10-15 minutes
- Reconnect and drive normally
SCS Circuit Method (for some models):
- Connect a Honda PGM tester to the DLC (under the dash on the passenger side)
- Follow the procedure of turning the steering wheel 45 degrees left at specific times
- The EPS indicator should blink twice when codes are cleared
Note: Some codes are “memorized” and cannot be cleared simply by disconnecting the battery or resetting the ECU. Codes 22, 23, 64, and 66 will remain until properly diagnosed and repaired .
Always secure heavy items in the cargo area during a drive. While EPS issues won’t affect cargo safety, sudden steering changes can be jarring if you’re not prepared for heavier steering feel.
Prevention and Maintenance
The good news about EPS is that maintenance is minimal compared to hydraulic systems. Here’s what you can do:
Keep Your Battery Healthy
EPS depends on stable voltage. Replace your battery when it shows signs of weakness, and have your alternator checked regularly .
Maintain Proper Tire Pressure
Under-inflated tires increase steering effort, which can put extra strain on the EPS motor .
Check Wheel Alignment
Bad alignment makes the car pull, requiring constant steering corrections and potentially overheating the EPS motor .
Inspect Wiring Connectors
Especially in older Hondas or vehicles driven in wet conditions, check the EPS module connections for corrosion. A simple cleaning can sometimes solve issues .
Avoid Excessive Parking Lot Maneuvers
Rapid back-and-forth steering at low speeds can overheat the EPS motor, which will reduce assist and could trigger a temporary warning .
FAQ
What does the EPS light mean on a Honda?
It means the Electric Power Steering system has detected a problem and may have reduced or disabled power assist to protect the system. Steering will feel heavier than usual.
Is it safe to drive with the EPS light on?
Yes, you can usually drive, but steering will be heavier—especially at low speeds like parking. The mechanical steering link is still intact . Have the system checked as soon as possible.
Why does my EPS light come and go?
This often points to an intermittent electrical issue, such as a loose wiring connection or a failing battery. A common cause is corroded pins in the EPS module connector . Have it diagnosed before it becomes a permanent failure.
Can a weak battery cause the EPS light?
Yes. EPS is sensitive to voltage. A failing battery or alternator can trigger the EPS light and reduce assist .
How do I reset the EPS light?
Some codes can be reset by disconnecting the battery or using a Honda scan tool. However, if the underlying problem isn’t fixed, the light will return. A professional diagnosis is recommended .
What’s the most common EPS problem in Hondas?
Low battery voltage and poor electrical connections are very common. Loose wiring or corroded connector pins often cause intermittent issues .
Will the EPS light go off by itself?
If the fault is temporary—like a voltage drop or an overheated motor—the light may go off after the system resets. But if a sensor has failed or there’s a wiring issue, the light will stay on until repaired.
Have you experienced an EPS warning light in your Honda? What was the fix? Drop your story in the comments below—we’d love to hear what worked for you.
For further reading on Honda EPS systems and troubleshooting:
