2019 Polaris Sportsman 570 Diagnostic Codes: Your Complete Guide

You’re geared up for a day on the trails. The cooler is packed, the tank is full, and your 2019 Polaris Sportsman 570 is humming. Then, it happens—that dreaded little orange light flickers to life on your dash. The check engine light. It’s a moment that can sink the heart of any rider, turning a day of adventure into a day of anxiety.

But what if that light wasn’t a mystery? What if it was your ATV talking to you, telling you exactly what it needs? We promise that by the end of this guide, you’ll see that light not as a problem, but as a starting point. You’ll have the confidence to pull and understand your machine’s fault codes yourself.

We’re going to walk you through a complete 2019 polaris sportsman 570 diagnostic codes guide. You’ll learn how to access the hidden diagnostic menu without any special tools, decipher what the most common codes mean, and understand the best practices for clearing them once you’ve fixed the issue. Let’s turn you into your own first line of defense on the trail.

What Are Diagnostic Trouble Codes (DTCs) on Your Sportsman 570?

Think of Diagnostic Trouble Codes, or DTCs, as a specific language your Sportsman uses to communicate with you. Your ATV is packed with sensors monitoring everything from engine temperature to throttle position. These sensors constantly report 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—say, a voltage that’s too high or too low—it flags the problem. It then stores a specific DTC and, in most cases, illuminates the check engine light (CEL) to get your attention.

Understanding these codes is the first and most crucial step in any DIY repair. One of the key benefits of 2019 polaris sportsman 570 diagnostic codes is that they take the guesswork out of troubleshooting, pointing you directly to the problem area and saving you time and money.

Understanding the Code Structure: SPN & FMI

Polaris codes aren’t just random numbers. They typically follow a standard format you’ll see on your display. You’ll get two key pieces of information:

SPN (Suspect Parameter Number): This tells you which system or component is having a problem. For example, an SPN might point to the throttle position sensor or an injector circuit.
FMI (Failure Mode Identifier): This tells you what kind of problem the component is having. Common FMIs include “Voltage Above Normal,” “Voltage Below Normal,” or “Data Erratic.”

Together, the SPN and FMI give you a precise diagnosis. For instance, a code might tell you not just that the coolant sensor is acting up (the SPN), but that its circuit is shorted to ground (the FMI).

How to Access Your 2019 Polaris Sportsman 570 Diagnostic Codes (No Special Tools Needed!)

Here’s the best part: you don’t need a fancy, expensive OBD-II scanner like you would for a car. Polaris built a powerful diagnostic tool right into your ATV’s gauge cluster. This section covers how to 2019 polaris sportsman 570 diagnostic codes are accessed directly from the rider’s seat.

Follow these steps carefully. Grab your key, but leave your helmet off for this one.

Position the ATV: Make sure your Sportsman is on a level surface and in Park (P).
Key On, Engine Off: Turn the ignition key to the ON position. Do not start the engine. You should see the gauge cluster light up and perform its initial sweep.
Wait for the Self-Test: Let the gauge complete its startup sequence. You’ll see the check engine and other warning lights illuminate briefly.
Enter Diagnostic Mode: Press and hold the MODE/OVERRIDE button (the yellow button on the left handlebar control pod). Continue holding it as you cycle through the main display screens (hours, trip meter, etc.).
Find the Codes: After cycling through the normal screens, you will land on the diagnostic codes screen. If a code is present, it will be displayed here. If there are multiple codes, you can press the MODE button briefly to cycle through them one by one.
Write It Down: This is critical! Write down every single code, including both the SPN and FMI numbers. A note on your phone or a small notepad in your toolkit is perfect. Do not rely on memory.

That’s it! You’ve just pulled the diagnostic codes. Now, let’s figure out what they mean.

Common 2019 Polaris Sportsman 570 Diagnostic Codes and What They Mean

Once you have your codes, it’s time to translate them into actionable information. While a full service manual is the ultimate resource, many codes are quite common. Here are some of the frequent culprits you might encounter and the common problems with 2019 polaris sportsman 570 diagnostic codes they represent.

Engine and Fuel System Codes

SPN 102 – Manifold Absolute Pressure (MAP) Sensor: This sensor measures air pressure in the intake manifold.
- FMI 3: Voltage too high. Often a wiring issue or a faulty sensor.
- FMI 4: Voltage too low. Check for damaged wires, a poor connection, or a bad sensor.
SPN 22 – Throttle Position Sensor (TPS): This tells the ECM how far you’re opening the throttle. A bad TPS can cause poor idling, hesitation, or limp mode.
- FMI 3 & 4: Voltage too high or low. Check the wiring harness near the throttle body for damage from rubbing or heat.
- FMI 0 or 2: Data erratic or out of range. The sensor might need to be adjusted or replaced.
SPN 651 – Fuel Injector 1: This points to a problem with the injector circuit.
- FMI 3 & 4: Voltage issues, often pointing to a short or open in the injector wiring.
- FMI 5: Current below normal. Could be a bad injector coil or a poor connection.
SPN 110 – Engine Coolant Temperature (ECT) Sensor: This sensor monitors engine temp to adjust fuel mixture and control the cooling fan.
- FMI 3 & 4: Voltage high/low. Check the connector for corrosion or damage. A faulty sensor can cause the fan to run constantly or not at all.

Chassis and Drivetrain Codes

SPN 520207 – All-Wheel Drive (AWD) Control System: This is a common one if your AWD isn’t engaging correctly.
- FMI 7: Mechanical system not responding. This often means the front differential fluid is low or contaminated, the armature plate is worn, or there’s an internal mechanical failure.
SPN 84 – Vehicle Speed Sensor (VSS): This sensor tells the ECM, speedometer, and sometimes the power steering how fast you’re going.
- FMI 2: Data erratic. Check for a dirty or damaged sensor at the transmission, or wiring issues. A faulty VSS can cause erratic speedometer behavior and AWD engagement problems.

Disclaimer: This is not an exhaustive list. Always consult a factory service manual for your specific 2019 Sportsman 570 for a complete list of codes and detailed diagnostic procedures.

After the Diagnosis: A Guide to Clearing Codes

So you’ve found the code, tracked down the problem—a frayed wire on the TPS, for example—and you’ve fixed it. Now what? You need to clear the code to turn off the check engine light and confirm your repair was successful.

Here’s one of the most important 2019 polaris sportsman 570 diagnostic codes best practices: NEVER clear a code without first fixing the underlying issue. Clearing the code only turns off the light; it doesn’t solve the problem. The code will just come back, and you risk damaging your machine by ignoring the warning.

On most 2019 Sportsman 570 models, the process is straightforward:

Fix the Problem: Perform the necessary repair. This could be replacing a sensor, cleaning a corroded connector with contact cleaner, or repairing a damaged wire.
Ride the ATV: In many cases, once the ECM sees that the fault condition is gone, it will automatically clear the active code after a few successful run cycles. A run cycle typically means starting the machine, letting it reach operating temperature, and riding it for a short period.
Battery Disconnect (Last Resort): Some DIYers disconnect the negative battery terminal for 10-15 minutes to clear codes. While this can work, it’s not the preferred method as it can also reset other learned parameters in the ECM. Only use this if the code persists after you are 100% certain the repair is complete and correct.

Pro Tips for Troubleshooting and Maintenance

Reading codes is just the start. Becoming a great DIY mechanic means thinking critically and following a smart process. This 2019 polaris sportsman 570 diagnostic codes care guide will help you avoid common pitfalls.

H3: Don’t Just Replace Parts!

A code for a sensor doesn’t always mean the sensor is bad. It means the circuit has a problem. Before you spend $80 on a new sensor, inspect the entire circuit. Look for chewed wires, connectors full of mud or water, or pins that have backed out of the connector. A simple $5 can of electrical contact cleaner can solve more problems than you think.

H3: Check the Simple Stuff First

Before diving deep, always start with the basics. Is your battery fully charged and are the terminals clean and tight? A weak battery can cause a host of bizarre electrical gremlins and throw random, unrelated codes. Check your fuses. A single blown fuse can disable an entire system.

H3: A Note on Sustainable and Eco-Friendly Repairs

Being a good rider also means being a good steward of our trails and environment. When troubleshooting, practice sustainable 2019 polaris sportsman 570 diagnostic codes repair. This means taking the time to repair a wiring harness with quality heat-shrink connectors instead of replacing the whole thing. It means cleaning a sensor or connector before throwing it away. These eco-friendly 2019 polaris sportsman 570 diagnostic codes practices not only save you money but also reduce waste.

Frequently Asked Questions About 2019 Polaris Sportsman 570 Diagnostic Codes

Can I ride my Sportsman with the check engine light on?

It’s risky. If the light is steady, it could be a minor issue like an emissions sensor. However, if the light is flashing, it indicates a severe problem, like a major engine misfire that could damage expensive components. Our advice: If the light comes on, find a safe place to pull over, check the code, and make an informed decision. Limping back to the truck is better than getting stranded or causing a catastrophic failure.

Do I need a special scanner to read the codes on my 2019 Sportsman 570?

No! That’s one of the best features of this machine. You can access all the essential diagnostic codes directly through the built-in digital display on your gauge cluster using the steps we outlined above. No extra purchases are necessary.

The code went away on its own. Am I good to go?

Possibly, but be cautious. This usually points to an intermittent problem. The most common cause is a loose electrical connection, a wire that’s starting to chafe, or water getting into a connector. The fault condition existed long enough to trigger a code but then resolved itself. Make a note of the code and keep an eye out for it. If it comes back, you know you have a real issue to hunt down.

Armed with this knowledge, that little orange light is no longer a mystery. It’s a direct line to your ATV’s brain, giving you the power to diagnose and fix issues on your own terms. Understanding your machine on this level is one of the most rewarding parts of being an off-road enthusiast.

So, the next time a code pops up, don’t panic. Follow this guide, trust the process, and get yourself back on the trail with confidence. Ride smart, ride safe, and we’ll see you out there!

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Thomas Corle

Founder & Automobile expert at FatBoysOffroad

Automobile expert and off-road enthusiast, sharing in-depth knowledge of vehicles, gear, and adventures. Helping readers make smart decisions and enjoy the thrill of off-roading safely and confidently.