That blinking check engine light on your 2020 Polaris Sportsman 570’s dash can stop a great trail day right in its tracks. It’s a frustrating moment that leaves you wondering: Is this a minor hiccup or a major problem? Your mind starts racing through expensive repair shop scenarios.
But what if I told you that you have the power to understand exactly what your machine is telling you, right there in your own garage? This guide promises to empower you to do just that. We’re not just guessing; we’re using the machine’s own self-diagnostic system to our advantage.
In this article, we’ll walk you through a complete 2020 Polaris Sportsman 570 diagnostic codes guide. You’ll learn how to access the codes without any special tools, understand what the most common faults mean, and get actionable, step-by-step tips to troubleshoot the issue yourself. Let’s turn that blinking light from a problem into a solution.
What Are Diagnostic Trouble Codes (DTCs) on Your Sportsman 570?
Think of Diagnostic Trouble Codes, or DTCs, as your ATV’s way of speaking to you. Your Sportsman is packed with sensors monitoring everything from engine temperature and throttle position to wheel speed and exhaust gases. These sensors constantly send data back to the brain of the operation: the Engine Control Module (ECM).
When the ECM receives a signal from a sensor that’s outside of its normal operating range, it does two things. First, it triggers the check engine light (CEL) or a warning message on your display. Second, it stores a specific diagnostic code in its memory, pointing you toward the source of the problem.
Understanding these codes offers huge benefits. It takes the guesswork out of troubleshooting, saves you from potentially unnecessary trips to the dealer, and empowers you to make informed decisions about your machine’s health. A code is the start of the diagnosis, not the final answer, but it’s the most critical first step.
How to Access Your 2020 Polaris Sportsman 570 Diagnostic Codes
One of the best things about modern Polaris machines is that you don’t need a fancy, expensive scan tool to read the basic fault codes. The process is built right into your instrument cluster. Here’s how to access your 2020 Polaris Sportsman 570 diagnostic codes.
Step-by-Step: Reading the Codes
Follow these simple steps to retrieve the codes. It’s a good idea to have a pen and paper or your phone’s notepad ready to jot them down.
- Turn the Key to the ON Position: Do not start the engine. Let the instrument cluster power up and complete its self-test sweep.
- Toggle the Display: Use the MODE/OVERRIDE button on the left-hand control pod to cycle through the display screens (e.g., odometer, trip meter, engine hours) until you reach the diagnostic code screen. You’ll know you’re there when you see “Ck ENG” or a similar indicator.
- Check for Active Codes: If there are active codes, the display will show them. If there are no codes present, it will typically display “No Codes” or a similar message.
- Read the Code Sequence: The codes are usually displayed in a two-part format: an SPN (Suspect Parameter Number) and an FMI (Failure Mode Identifier). For example, you might see 520207 followed by a 4. Write down both numbers exactly as they appear. The display may cycle through multiple codes if more than one fault is present.
Understanding SPN and FMI Numbers
It’s crucial to understand what these numbers mean. They are the standard for powersports and heavy equipment diagnostics.
- SPN (Suspect Parameter Number): This is the “what.” It tells you which system or specific component is reporting a fault. For example, an SPN might point to the throttle position sensor, an oxygen sensor, or the power steering system.
- FMI (Failure Mode Identifier): This is the “how.” It describes the type of failure. Common FMI numbers include things like “Voltage Above Normal,” “Voltage Below Normal,” “Data Erratic,” or “Condition Exists.”
Together, the SPN and FMI give you a highly specific starting point. An SPN for the throttle position sensor combined with an FMI for “Voltage Above Normal” tells you exactly where and what to start looking for.
Decoding Common Problems with 2020 Polaris Sportsman 570 Diagnostic Codes
Once you have your codes, the next step is to figure out what they mean. While a full Polaris service manual is the ultimate resource, many codes are common across the platform. Here are some of the most frequent issues you might encounter.
Fuel System and Misfire Codes
These codes often relate to how your engine is breathing and getting fuel. They can cause poor running, stalling, or a no-start condition.
- SPN 94, FMI 3/4 (Fuel Level Sensor): Indicates a problem with the fuel sending unit circuit, often due to a bad connection or a faulty sensor in the tank.
- SPN 651, FMI 5 (Engine Misfire Detected): This is a generic misfire code. The cause could be anything from a fouled spark plug or bad ignition coil to a clogged fuel injector or low fuel pressure. This code often requires more digging.
Sensor-Related Faults (TPS, T-MAP, O2)
Your Sportsman relies on a network of sensors to run properly. When one fails, it can throw the whole system out of whack.
- SPN 520207, FMI 3/4 (Throttle Position Sensor Circuit): This is one of the most common Polaris codes. It can cause erratic idle, poor throttle response, and limp mode. The cause is often a faulty connection at the sensor or a bad sensor itself.
- SPN 102, FMI 3/4 (Manifold Absolute Pressure): The T-MAP sensor measures air pressure and temperature. A fault here can lead to a rich or lean running condition, affecting performance and fuel economy. Check the wiring and ensure the sensor is clean.
- SPN 520272, FMI 2/3/4 (Oxygen Sensor): Found on models with EFI, this sensor monitors exhaust gases. A failure can hurt fuel efficiency and performance. Often caused by a bad sensor or a damaged wire.
Electrical and Power Steering (EPS) Codes
Electrical gremlins can be frustrating, but the codes give you a map to follow.
- SPN 168, FMI 3/4 (System Voltage): This code points to a charging system issue. FMI 3 (Voltage Above Normal) suggests a faulty voltage regulator, while FMI 4 (Voltage Below Normal) often indicates a weak battery, a bad stator, or poor connections.
- SPN 520230, FMI 31 (EPS Malfunction): If your power steering fails and this code appears, it indicates a fault within the EPS unit. Check all connections first, but this can sometimes point to an internal failure in the EPS motor or module.
A Practical Guide to Troubleshooting: From Code to Fix
Having the code is just the beginning. This practical 2020 Polaris Sportsman 570 diagnostic codes guide wouldn’t be complete without telling you what to do next. Follow a logical process to avoid throwing parts at a problem.
Step 1: Document and Research
Write down your SPN and FMI numbers. A quick search online, especially in forums dedicated to Polaris ATVs, can often reveal common fixes for your specific code. Cross-reference this with your owner’s manual or, ideally, a factory service manual.
Step 2: The All-Important Visual Inspection
Before you even think about grabbing a wrench, use your eyes. Many problems, especially electrical ones, can be found this way.
- Check Wiring: Look at the sensor or component indicated by the code. Is the wiring harness plugged in securely? Are there any frayed, pinched, or melted wires? Mud and water can cause corrosion in connectors, so unplug them (if accessible) and check for green or white crust.
- Look for Damage: Did a rock or branch hit something underneath? Is a vacuum line cracked or disconnected? A thorough visual inspection is one of the most effective best practices for any DIY mechanic.
- Check Your Battery: A weak or failing battery can cause a cascade of random, misleading electrical codes. Ensure your battery terminals are clean and tight and that the battery holds a proper charge (at least 12.6 volts at rest).
Step 3: When to Call a Pro
Knowing your limits is key to a successful repair. While tasks like cleaning a connector, replacing a spark plug, or changing a sensor are well within the reach of most DIYers, some jobs are best left to a professional technician.
If the diagnosis points to internal engine work, ECU flashing, or complex diagnostics requiring specialized tools (like a fuel pressure gauge or digital multimeter you’re not comfortable with), it’s time to make a call. There’s no shame in getting expert help to ensure the job is done right.
Best Practices for a Code-Free Ride: A Care Guide
The best way to deal with diagnostic codes is to prevent them from happening in the first place. This is where a solid maintenance routine and care guide comes into play.
Consistent Maintenance is Non-Negotiable
Following the service intervals in your owner’s manual is critical. Regular oil changes, air filter cleaning/replacement, and spark plug checks prevent many of the mechanical issues that can eventually trigger a fault code.
Focus on Electrical Health
Keep your battery on a tender if you don’t ride often. Periodically inspect the main wiring harnesses for rubbing or damage. A small dab of dielectric grease on important electrical connectors during maintenance can prevent moisture intrusion and corrosion for years.
Sustainable and Eco-Friendly Care Tips
Thinking about long-term health is both sustainable and smart. Using high-quality, manufacturer-recommended fluids ensures your engine and drivetrain are protected, reducing wear that can lead to sensor failures. Keeping your air filter clean not only protects your engine but also ensures you’re running efficiently, which is better for both your wallet and the environment. When you replace parts like batteries or sensors, always follow local regulations for proper, eco-friendly disposal.
Frequently Asked Questions About 2020 Polaris Sportsman 570 Diagnostic Codes
How do I clear the diagnostic codes on my Sportsman 570?
In most cases, once you fix the underlying problem, the code will clear itself after a few ride cycles. For a “hard reset,” you can disconnect the negative battery terminal for about 10-15 minutes. Be aware this will also reset your trip meter and clock.
Can I still ride my ATV with the check engine light on?
It depends entirely on the code and symptoms. If the machine is running fine and the code points to a non-critical sensor, you might be able to limp it home carefully. However, if the light is flashing, or if the machine is overheating, making strange noises, or running very poorly, you should stop immediately to prevent further damage.
What’s the difference between an SPN and an FMI number?
Think of it like this: The SPN (Suspect Parameter Number) tells you which part of the ATV is reporting a problem (e.g., the O2 sensor). The FMI (Failure Mode Identifier) tells you what kind of problem it is (e.g., the sensor’s voltage is too low).
Do I need an expensive OBD-II scanner for my Polaris?
No. Unlike cars, Polaris ATVs use a proprietary diagnostic system. Fortunately, the most important function—reading the codes—is built right into the instrument cluster, so no external scanner is needed for basic troubleshooting.
That check engine light doesn’t have to be a mystery anymore. By understanding how to access, read, and interpret your 2020 Polaris Sportsman 570 diagnostic codes, you’ve taken a huge step toward becoming a more confident and capable owner. Start with the simple checks, trust the process, and know when to ask for help.
Now you’re equipped to tackle that blinking light with a plan. Get those codes cleared, get the issue fixed, and get back to what matters—the ride. Stay safe and happy wrenching!
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