2013 Polaris Ranger 800 Code 651 - Your Complete DIY Diagnostic Guide

There’s nothing that kills the mood for a trail ride faster than hopping into your rig, turning the key, and being greeted by that dreaded check engine light. Your 2013 Polaris Ranger 800 sputters, idles rough, and the dash flashes a cryptic message: Fault Code 651. We’ve all been there, and that feeling of frustration is universal.

You’re probably wondering what that code even means and picturing an expensive trip to the dealer. But what if I told you that you could likely diagnose and fix this issue right in your own garage with a few basic tools?

In this complete guide from FatBoysOffroad, we promise to demystify the 2013 polaris ranger 800 code 651. We’ll walk you through exactly what the code means, the tools you’ll need, a step-by-step process to pinpoint the problem, and how to fix it for good. Let’s get those wrenches turning and get you back on the dirt.

What Exactly is Fault Code 651 on a 2013 Polaris Ranger 800?

First things first, let’s translate that code into plain English. The technical definition for code 651 (specifically SPN 651, FMI 5) is “Injector 1 (PTO/Mag Side) Circuit Open / Grounded.”

That sounds complicated, but it’s actually straightforward. Your Ranger’s brain, the Engine Control Unit (ECU), is telling you it has detected an electrical problem with the fuel injector on the PTO (Power Take-Off) side of the engine. This is the cylinder closest to the primary clutch, which is on the driver’s side of your Ranger.

The problem is almost always one of three things:

The wiring to the injector is broken, loose, or shorted out.
The injector’s electrical connector is corroded or damaged.
The fuel injector itself has failed internally.

When this happens, that cylinder isn’t getting fuel correctly, leading to the symptoms you’re experiencing. This is one of the more common problems with 2013 polaris ranger 800 code 651, but it’s very fixable.

Common Symptoms of Code 651

If your ECU is throwing code 651, you’ll likely notice more than just a light on the dash. Your Ranger will probably be showing these signs:

Rough Idle: The engine will shake and sputter at idle because it’s essentially running on only one cylinder.
Significant Power Loss: You’ll feel a major lack of acceleration and power.
Misfiring or Backfiring: You might hear popping sounds from the exhaust.
Hard Starting: The engine will struggle to turn over and start.
Strong Smell of Fuel: Unburnt fuel might be passing through the engine.

Essential Tools and Safety Precautions Before You Start

Before you dive in, let’s get our gear in order. Having the right tools makes the job smoother and safer. You don’t need a full professional shop, just a few key items.

Required Tools:

Digital Multimeter: This is non-negotiable. You need it to test electrical circuits. Any basic model will do.
Socket and Ratchet Set: To remove panels or components for access.
Flashlight or Headlamp: Good lighting is crucial for spotting wire damage.
Electrical Contact Cleaner: A spray cleaner for flushing out grime from connectors.
Dielectric Grease: To protect electrical connections from moisture and corrosion.
Needle-Nose Pliers: Helpful for manipulating small connectors and wires.
Wire Strippers & Butt Connectors (optional): If you find a broken wire that needs repair.

Safety First, Always

Working on any vehicle requires care. Follow these simple rules to stay safe.

Let It Cool Down: The engine and exhaust get extremely hot. Give your Ranger at least an hour to cool off before you start working.
Disconnect the Battery: Before touching any wiring, disconnect the negative battery terminal to prevent accidental shorts.
Work in a Ventilated Area: If you need to run the engine to check your work, make sure you’re in a well-ventilated space like an open garage or outdoors.

Your Step-by-Step 2013 Polaris Ranger 800 Code 651 Guide

Alright, let’s get to the heart of it. We’re going to work from the easiest and most common potential causes to the more involved ones. Follow these steps in order, and don’t skip ahead! This is how to 2013 polaris ranger 800 code 651 diagnostics are done right.

Step 1: Visual Inspection – The Easiest Checks First

Your eyes are your best diagnostic tool. Start by locating Injector 1. On the 800 engine, you’ll need to lift the bed. The injector is on the driver’s side cylinder, plugged directly into the engine near the top.

Grab your flashlight and carefully inspect the entire length of the wire running to that injector. Look for:

Obvious Breaks or Frays: Wires can rub against the frame or engine components and wear through.
Rodent Damage: Mice and other critters love to chew on wiring harnesses. Look for chew marks or nests.
Burnt or Melted Sections: A wire touching a hot exhaust pipe can easily melt.
Loose Connector: Make sure the plastic connector is firmly and fully clicked onto the fuel injector.

Pro Tip: A surprising number of electrical issues are found in this first step. Take your time here. If you find a damaged wire, you’ve likely found your culprit.

Step 2: Checking the Injector Connector

If the visual inspection doesn’t reveal anything, the next step is to check the connection point. This is a major source of common problems with 2013 polaris ranger 800 code 651.

Carefully unplug the wiring harness from the fuel injector. There’s a small tab you’ll need to press to release it. Once it’s off, inspect both the harness side and the injector side of the connection.

Look for any signs of corrosion (a white or greenish powder), dirt, or moisture. Check that the small metal pins inside are straight and not bent or pushed back. If you see any corrosion, spray it liberally with your electrical contact cleaner and use a small brush (like a toothbrush) to gently scrub it clean. Let it dry completely.

Step 3: Testing the Fuel Injector Itself

Now it’s time to break out the multimeter and see if the injector is electrically sound. This is simpler than it sounds.

Set your multimeter to the Ohms (Ω) setting, usually on the 200 scale.
Touch one multimeter probe to each of the two metal prongs on the fuel injector itself (where the connector plugs in). The polarity doesn’t matter.
A good 2013 Ranger 800 fuel injector should have a resistance reading of approximately 12.0 Ohms, give or take a little.

If your multimeter reads “OL” (Open Loop/Over Limit) or 0.0, the coil inside the injector has failed. The injector is bad and needs to be replaced. If the reading is within the correct range, the injector is likely good, and the problem is in the wiring.

Step 4: Testing the Wiring Harness

If the injector tests good, the fault lies in the wiring between the ECU and the injector. We need to check for two things: an open circuit (a broken wire) and a short circuit (a wire touching ground).

For this, you’ll need to locate the main ECU connector. You’ll need a wiring diagram for your specific model to identify the correct pins for Injector 1. A service manual is invaluable here.

To check for an open circuit (continuity):

Set your multimeter to the continuity setting (it will beep when the probes touch).
Disconnect the main ECU harness and the injector connector.
Touch one probe to the corresponding pin for Injector 1 at the ECU connector and the other probe to the corresponding pin at the injector connector.
You should hear a beep, indicating a complete circuit. If there’s no beep, that wire is broken somewhere. Repeat for the second wire.

To check for a short to ground:

Keep the multimeter on the continuity setting.
Touch one probe to a pin on the injector connector.
Touch the other probe to a clean, bare metal part of the Ranger’s frame (a good ground).
You should NOT hear a beep. If you do, that wire is shorted to the frame somewhere. Repeat for the other wire.

When to Put Down the Wrenches and Call a Pro

DIY is empowering, but it’s also important to know your limits. If you’ve gone through all the steps above and are still stumped, or if you’re not comfortable with electrical testing, it might be time to call a qualified mechanic.

Specifically, if all the wiring and the injector test perfectly fine, there is a small chance the fault lies within the ECU itself. Diagnosing and replacing an ECU is a job best left to the professionals.

A Proactive 2013 Polaris Ranger 800 Code 651 Care Guide

The best fix is prevention. Following a few 2013 polaris ranger 800 code 651 best practices can save you a headache down the road.

Apply Dielectric Grease: After cleaning any connector, or as part of your regular maintenance, apply a small dab of dielectric grease inside the connector before plugging it back in. This seals out moisture and prevents corrosion.
Secure Your Harness: Use zip ties to ensure wiring harnesses are secure and not rubbing against the frame or hot engine parts.
Practice Rodent Control: If you store your Ranger for long periods, take steps to deter rodents. Peppermint oil-soaked cotton balls or specialized rodent-repellent tape can work wonders. This is a surprisingly sustainable 2013 polaris ranger 800 code 651 prevention tip!

Frequently Asked Questions About the 2013 Polaris Ranger 800 Code 651

Can I still drive my Ranger with code 651?

It is strongly not recommended. You are running on only one of two cylinders. This not only puts a huge strain on the engine but can also dump unburnt fuel into your exhaust, potentially damaging the catalytic converter and leading to a much more expensive repair.

How much does it cost to fix code 651?

The cost varies wildly. If it’s a corroded connector, your fix might cost less than $10 for a can of contact cleaner. If you need to replace the fuel injector, the part itself can range from $50 to $100+. A professional shop diagnosis and repair could run from $200 to $400, depending on labor rates.

Is Injector 1 on the driver’s side or passenger’s side?

Injector 1 (the PTO side) is on the driver’s side of the 2013 Polaris Ranger 800, closest to the clutch assembly.

What does SPN 651 FMI 5 actually mean again?

In simple terms, it’s the specific technical name for the fault. SPN 651 identifies the component (Injector 1), and FMI 5 describes the type of failure (an open circuit or a current level that is too low), which points to a wiring or component failure.

Tackling a check engine light can feel intimidating, but with a logical approach and a little patience, the 2013 Polaris Ranger 800 code 651 is an issue you can absolutely handle. By following this guide, you’ve not only learned how to fix the problem but also gained valuable experience that will serve you on every future ride. Now, clear that code, double-check your work, and get back to what you love doing.

Ride safe, wrench smart, and we’ll see you on the trails!

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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.