2021 Polaris Sportsman 570 Diagnostic Codes

There’s nothing like the feeling of hitting the trail, but that excitement can grind to a halt when a warning light flashes on your 2021 Polaris Sportsman 570’s dash. That blinking check engine light can feel like a ride-ending mystery.

But what if we told you that light isn’t a problem, but a solution? Your ATV is trying to talk to you, giving you the exact clues you need to solve the issue. This isn’t just a warning; it’s a roadmap to a fix.

In this complete guide, we’ll demystify the world of 2021 Polaris Sportsman 570 diagnostic codes. We’ll show you exactly how to access them, what the most common ones mean, and how you can confidently diagnose and repair many issues yourself, saving you time, money, and a trip to the dealer.

Why Understanding Your ATV’s Diagnostic Codes is a Game-Changer

Think of your Sportsman’s Engine Control Unit (ECU) as its brain. It constantly monitors dozens of sensors, from engine temperature to throttle position. When a sensor reading falls outside its normal range, the ECU logs a Diagnostic Trouble Code (DTC) and turns on the check engine light.

Ignoring these codes is like ignoring a strange noise in your engine—it rarely gets better on its own. The real benefits of 2021 polaris sportsman 570 diagnostic codes come when you learn to interpret them.

By understanding these codes, you can:

Save Money: Diagnose issues yourself and avoid costly diagnostic fees at a shop. You can also pinpoint the exact part that needs replacing instead of guessing.
Save Time: Get back on the trail faster by identifying the problem quickly. No more waiting for a service appointment for a simple sensor fix.
Prevent Major Damage: A small issue, like a faulty oxygen sensor, can lead to bigger, more expensive engine problems if left unchecked.
Become a Smarter Owner: Knowing your machine inside and out builds confidence and makes you a more capable rider and DIY mechanic.

How to Access 2021 Polaris Sportsman 570 Diagnostic Codes: A Step-by-Step Guide

Fortunately, Polaris makes it incredibly easy to access these codes right from your digital instrument cluster. You don’t need a fancy OBD-II scanner like you would for a car. This is the first step in our how to 2021 polaris sportsman 570 diagnostic codes process.

Follow these simple steps. Perform this check in a well-lit, safe area with the machine on level ground.

Turn the Key On (Don’t Start): Insert your key and turn it to the ‘ON’ position. Let the instrument cluster power up and cycle through its startup sequence.
Navigate the Menu: Use the mode/override button on your left handlebar control pod. Press and release it to cycle through the display options (odometer, trip meter, engine hours, etc.).
Find the Check Engine Screen: Continue cycling through the screens until you see the check engine icon (it looks like a small engine). If there are active codes, the word “Check” or “Code” might be displayed.
Press and Hold: Once on the check engine screen, press and hold the mode/override button for a few seconds. The screen will change to display the active diagnostic codes.
Read the Codes: The codes will appear in a specific format, usually a series of numbers. There will be a main code (SPN) and a failure mode identifier (FMI). Write down all the numbers exactly as they appear. If there are multiple codes, it will cycle through them.

Once you have your codes written down, you’re ready for the next step: figuring out what they mean.

Decoding the Numbers: A Comprehensive 2021 Polaris Sportsman 570 Diagnostic Codes Guide

This is where the real detective work begins. A code points you to a specific system, not necessarily a specific failed part. For example, a code for the Throttle Position Sensor (TPS) could mean the sensor is bad, the wiring is damaged, or the connector is loose. This guide will help you understand the most common problems with 2021 polaris sportsman 570 diagnostic codes.

Below are some frequently seen codes, what they mean, and where to start looking.

Engine & Fuel System Codes

These codes relate to how your engine is breathing, getting fuel, and firing.

Code 71 – Misfire Detected:
- What it means: The ECU has detected that one or more cylinders are not firing correctly.
- Common Causes: Fouled or old spark plug, bad spark plug wire or cap, clogged fuel injector, or low-quality fuel.
- First Steps: Start with the simplest fix. Check and replace the spark plug. Ensure the plug cap is seated firmly.
Code 51 – Injector 1: Open Load:
- What it means: There’s a break in the electrical circuit for the fuel injector.
- Common Causes: The fuel injector connector has come loose, a wire has been broken or chewed by a rodent, or the injector itself has failed.
- First Steps: Locate the fuel injector on the engine. Check that its electrical connector is clean and securely clipped on. Inspect the wiring for any visible damage.
Code 22 & 21 – Throttle Position Sensor (TPS) Circuit High/Low:
- What it means: The ECU is getting an erratic or out-of-range voltage reading from the sensor that monitors your throttle input. This can cause poor idling or hesitation.
- Common Causes: A faulty TPS, a loose or corroded connector at the sensor, or damaged wiring.
- First Steps: Inspect the TPS wiring and connector near the throttle body. Unplug it, check for corrosion, and plug it back in securely.

Chassis & Drivetrain Codes

These codes often relate to your All-Wheel Drive (AWD), power steering (if equipped), and speed sensors.

Code 520207 – All Wheel Drive Control Circuit Driver Fault:
- What it means: A problem exists in the circuit that engages your front differential for AWD.
- Common Causes: A common culprit is a broken wire leading to the front differential coil. This often happens near the coil itself where the wire flexes. It can also be a faulty coil or a bad connection at the AWD switch on the handlebar.
- First Steps: Carefully inspect the two small wires going into the front differential housing. Look for breaks or frays. This is a very common failure point.
Code 84 – Vehicle Speed Sensor (VSS) Mismatch:
- What it means: The ECU is not receiving a proper signal about how fast the ATV is moving. This can affect AWD engagement and speedometer accuracy.
- Common Causes: A damaged VSS, a dirty or debris-covered sensor, or a wiring issue.
- First Steps: Locate the VSS on the transmission. Ensure it’s clean and its connector is secure.

Pro Tip: After performing a repair, it’s a good idea to clear the codes. Often, this can be done by disconnecting the battery for about 15-20 minutes. Reconnect it, start the machine, and see if the code returns. If it does, further diagnosis is needed.

Tools of the Trade: What You’ll Need for Diagnosis and Repair

You don’t need a full professional shop to tackle these issues. Having a few basic tools on hand makes the job much easier.

Basic Socket & Wrench Set: Essential for almost any job on your Sportsman.
Multimeter: This is your best friend for electrical diagnosis. A simple digital multimeter helps you test for continuity in wires and check sensor voltages.
Dielectric Grease: Apply a small amount to electrical connectors after cleaning them to prevent corrosion and ensure a good connection.
Wire Strippers & Connectors: For repairing any damaged wires you might find.
Owner’s/Service Manual: The ultimate resource. A service manual provides detailed wiring diagrams and diagnostic procedures.

Best Practices for a Healthy ECU: A Proactive Care Guide

The best way to deal with fault codes is to prevent them from happening in the first place. Following these 2021 polaris sportsman 570 diagnostic codes best practices will keep your machine’s electronic systems happy.

This is also where a sustainable 2021 polaris sportsman 570 diagnostic codes mindset comes in. A well-maintained machine runs efficiently, lasts longer, and requires fewer replacement parts, which is better for your wallet and the environment.

Keep it Clean, Keep it Happy

After a muddy or wet ride, take the time to gently wash your machine. Pay special attention to washing dirt and debris away from wiring harnesses and sensor locations. Don’t use a high-pressure washer directly on electrical components.

Regular Electrical Inspections

As part of your pre-ride check, visually inspect major wiring harnesses for rubbing, pinching, or damage. Make sure major connectors, like the one to the ECU, are secure. This simple 2021 polaris sportsman 570 diagnostic codes care guide can prevent a lot of headaches on the trail.

Use Dielectric Grease

Anytime you have an electrical connector apart, add a dab of dielectric grease. It’s non-conductive and seals out moisture and dirt, which are the primary causes of electrical gremlins. This is an eco-friendly 2021 polaris sportsman 570 diagnostic codes tip, as preventing corrosion extends the life of expensive electronic parts.

Frequently Asked Questions About 2021 Polaris Sportsman 570 Diagnostic Codes

Can I ride my Sportsman 570 with the check engine light on?

It depends on the code and if you notice any performance issues. If the machine is running poorly, overheating, or making strange noises, you should stop immediately. For less critical codes, you may be able to limp back to the truck, but it’s always best to diagnose and fix the issue as soon as possible to prevent further damage.

Will disconnecting the battery clear the codes?

Yes, disconnecting the battery for 15-20 minutes will typically clear the active fault codes from the ECU’s memory. However, if the underlying problem that caused the code has not been fixed, the code will reappear as soon as the ECU detects the fault again.

What if I get a code that’s not on this list?

This guide covers the most common codes, but there are hundreds of possibilities. If you get a code you can’t identify, your best resources are the official Polaris service manual for your specific model or reputable online forums where experienced owners and technicians share their knowledge.

Working on your own machine is one of the most rewarding parts of being an off-road enthusiast. By learning to read and understand your Sportsman’s diagnostic codes, you’re taking control of your machine’s health and empowering yourself to handle whatever the trail throws at you.

So next time that light comes on, don’t sweat it. Grab your tools, pull the codes, and get ready to solve the puzzle. Happy wrenching, and we’ll see you on the trail!

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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.