You’re blasting down a favorite trail, the engine is humming, and everything feels right with the world. Suddenly, your dash lights up with a cryptic message: polaris code 520338 31. To make matters worse, your steering feels like you’re trying to turn a tank in wet concrete. Your power steering is gone.
It’s a frustrating moment that can stop a great day of riding in its tracks. You’re left wondering what this code means and if it signals a wallet-draining repair.
We promise this guide will demystify that error code. We’re going to break down exactly what’s happening with your machine, why it’s happening, and give you a clear, step-by-step plan to diagnose and fix it yourself.
You’ll learn the common culprits, the tools you need, and the pro tips to prevent it from happening again. Let’s get those hands greasy and get your power steering back online.
What Exactly is Polaris Code 520338 31?
First things first, let’s translate that number into plain English. The polaris code 520338 31 is a specific diagnostic trouble code (DTC) related to your machine’s Electronic Power Steering (EPS) system.
Think of it as a message from your Polaris’s brain (the ECU) saying it has detected a problem with the electrical current powering the steering assist motor. The sub-code “31” specifically points to a “Current Control Fault.”
When the system detects this fault, it immediately enters a protective state often called “limp mode.” This shuts down the power steering assist to prevent further damage to the sensitive electronic components. The result? You’re left with heavy, purely manual steering, which is not only difficult but can be a serious safety hazard on challenging terrain.
Why You Can’t Ignore This Code
Ignoring this code isn’t really an option. While you can technically still drive the vehicle, the lack of power assist makes maneuvering at low speeds incredibly difficult and can be dangerous at high speeds if you need to make a sudden correction.
Addressing the root cause is crucial for maintaining control and safety on the trail. The good news is that the fix is often simpler and cheaper than you might think.
The Most Common Culprits: Why This Code Pops Up
Before you start fearing a four-figure repair bill for a new EPS unit, take a breath. In our experience, this code is most often caused by a simple electrical issue, not a catastrophic failure. Here are the main suspects, starting with the most likely.
Low Voltage: The #1 Suspect
Your EPS system is a power-hungry beast. It needs a steady supply of clean, strong voltage to function correctly. If the voltage drops, even for a moment, it can trigger the polaris code 520338 31.
Common causes of low voltage include a weak or aging battery, a faulty voltage regulator, or a charging system that can’t keep up (especially if you’re running a winch, light bars, and a stereo all at once).
Corroded or Loose Connections
This is a huge one for any off-road machine. Mud, water, and vibration are the mortal enemies of electrical connections. A slightly loose battery terminal, a corroded ground wire, or a dirty connector can create just enough resistance to starve the EPS unit of the power it needs.
The main ground wire from the battery to the frame is a frequent offender. This is a critical part of our polaris code 520338 31 guide; always check your grounds!
Damaged Wiring Harness
The wiring harness that runs to your EPS unit can take a beating. Over time, vibrations can cause the loom to rub against the frame, chafing through the insulation and causing a short. We’ve also seen damage from trail debris, improper routing after maintenance, and even rodents chewing on wires.
A Failing EPS Unit
While possible, this is the least likely cause. The EPS unit itself can fail internally, but you should exhaust every other possibility before condemning this expensive component. Jumping straight to this conclusion is one of the most common problems with polaris code 520338 31 diagnosis.
Your Diagnostic Toolkit: Gear Up for the Fix
You don’t need a full professional shop to tackle this job. With a few basic tools, you can diagnose and likely fix this issue in your own garage. Here’s what we recommend having on hand:
- Digital Multimeter: This is non-negotiable. You absolutely need one to accurately check battery voltage and test continuity.
- Socket and Wrench Set: For tightening battery terminals and checking ground connections. A 10mm socket is your best friend here.
- Wire Brush or Terminal Cleaner: To scrub away any corrosion on battery posts and cable ends.
- Dielectric Grease: To protect your clean connections from future moisture and corrosion.
- Flashlight or Headlamp: For inspecting the wiring harness in those dark nooks and crannies.
- Safety Gear: Always wear gloves and eye protection when working with batteries and electrical systems.
Step-by-Step Guide to Diagnosing and Fixing Polaris Code 520338 31
Alright, let’s walk through the diagnostic process logically. Follow these steps in order to avoid chasing your tail. This is where you’ll learn how to polaris code 520338 31 diagnostics are done right.
Step 1: The Simple Reset (Don’t Skip This!)
Before you grab any tools, try the simplest fix. Turn the ignition completely off. Wait a full 30 seconds to allow all the modules to power down. Then, turn the key back on. Sometimes, a temporary voltage glitch can trigger the code, and a simple key cycle is enough to clear it.
Step 2: Check Your Battery Health
Grab your multimeter. Set it to DC Volts. With the machine off, touch the red probe to the positive battery terminal and the black probe to the negative. A healthy, fully charged battery should read at least 12.4 volts. Anything less, and your battery is weak.
Next, start the engine. With the engine running at a fast idle, the voltage should jump up to around 13.8 to 14.4 volts. If it doesn’t, you have a charging system problem (likely the voltage regulator or stator).
Step 3: Inspect All Power and Ground Connections
This is the most critical step. With the key OFF, physically check the battery terminals. Are they tight? Any signs of fuzzy green or white corrosion? If so, disconnect them (negative first!), clean them thoroughly with a wire brush, and reconnect them (positive first!).
Now, follow the main negative battery cable to where it bolts to the frame. This is your main ground. Unbolt it, clean the contact surfaces on both the cable end and the frame until they are shiny, and bolt it back down securely.
Step 4: Trace the EPS Wiring Harness
Locate your EPS unit (its location varies by model, but it’s usually under the front plastics or dash). Carefully inspect the main wiring harness that plugs into it. Look for any signs of rubbing, melting, or pinching. Pay close attention to where the harness bends or passes near sharp edges on the frame.
Step 5: The “Wiggle Test”
This is a classic old-school mechanic’s trick. With the ignition ON (engine can be off), gently wiggle the connectors at the EPS unit and the main battery cables. If the power steering kicks on and off or you hear a clicking sound, you’ve likely found a loose connection inside a plug or a broken wire.
Step 6: When to Suspect the EPS Unit
If you have confirmed your battery is strong, your charging system is working perfectly, and all connections and wires are clean, tight, and undamaged, only then should you begin to suspect the EPS unit itself. At this point, unless you are very experienced with advanced electrical diagnostics, it may be time to consult a professional technician for confirmation before ordering such an expensive part.
Pro Tips for Preventing Future EPS Headaches
An ounce of prevention is worth a pound of cure. Following a good polaris code 520338 31 care guide can save you from future trailside troubles. The benefits of these simple habits are huge.
One of the best polaris code 520338 31 tips is to practice proactive maintenance. A sustainable approach to ownership means extending the life of your components, which is far more eco-friendly polaris code 520338 31 practice than replacing entire modules.
- Use a Battery Tender: If your Polaris sits for more than a week at a time, keep it on a smart battery tender. This will maximize battery life and ensure it’s always ready to go.
- Apply Dielectric Grease: After cleaning any electrical connection, apply a small amount of dielectric grease before you reconnect it. This seals out moisture and prevents future corrosion.
- Secure Your Wiring: Take a few minutes and some zip ties to ensure your wiring harnesses are neatly secured and not rubbing against anything.
- Post-Wash Checks: After a deep clean with a pressure washer, take a moment to check that your main electrical connections are still dry and secure.
Frequently Asked Questions About Polaris Code 520338 31
Can I still ride my Polaris with code 520338 31 active?
You can, but it is not recommended. The steering will be extremely heavy and difficult to control, especially in tight, technical terrain. It poses a significant safety risk, and you should resolve the issue before any serious riding.
How much does it cost to fix this code?
The cost can range from $0 to over $1,500. If the problem is a loose ground wire you tighten yourself, it’s free. If it’s a new battery, it could be $100-$250. If it truly is a failed EPS unit, the part itself can cost well over $1,000, plus labor.
Does this code always mean my EPS unit is bad?
Absolutely not. In fact, it is rarely the EPS unit itself. The vast majority of the time, this code is caused by a problem in the supporting electrical system, like the battery or wiring. Always follow the diagnostic steps before assuming the worst.
Will clearing the code with a diagnostic tool fix the problem?
No. Clearing the code only erases the fault from the ECU’s memory. If you haven’t fixed the underlying physical problem (like the corroded wire), the code will reappear as soon as the ECU detects the fault again, usually within seconds of starting the machine.
Tackling a diagnostic code like polaris code 520338 31 can feel intimidating, but it doesn’t have to be. By working through the problem logically—from the simplest solutions to the most complex—you can often find and fix the issue with basic tools and a little bit of patience.
Remember to always prioritize the fundamentals: voltage, grounds, and clean connections. Get those right, and you’ll solve most of the electrical gremlins your off-road machine can throw at you.
Now you have the knowledge to get your power steering back. Get in the garage, get it fixed, and get back out on the trail. Ride safe, and have fun!
- Getting Polaris 570 Error Codes – Your Ultimate DIY Diagnostic Guide - November 20, 2025
- All Polaris Error Codes – The Ultimate Guide To Diagnostics & Fixes - November 20, 2025
- Polaris Red Paint Code – Your Ultimate Guide To Flawless Touch-Ups - November 20, 2025