Understanding Can-Am Defender Fault Codes: What They Mean and How to Troubleshoot Them

Modern Can-Am Defenders are built with advanced monitoring systems to keep your ride running smoothly. But when something goes wrong, your Defender’s onboard diagnostics will generate fault codes to help pinpoint the issue. This guide explains what Can-Am Defender fault codes mean, how to read them, and what you can do to resolve them.

What Are Can-Am Defender Fault Codes?

Your Can-Am Defender uses a self-monitoring Engine Management System (EMS) that actively checks key components such as sensors, control modules, and actuators. When a malfunction is detected, the system triggers a fault code and displays a warning message on the digital dashboard.

There are three fault code states:

Active: The issue is currently present.

Occurred: The fault was present but is no longer detected.

Inactive: Not currently affecting performance but logged in the system.

Common Fault Messages on the Dashboard

If your Defender detects an issue, you may see one of these messages:

Can-Am Defender Fault Code Categories

Every fault code on the Can-Am Defender has an alphanumeric format that helps identify the issue:

• P-Codes (e.g., P0116): Powertrain-related issues.
• U-Codes (e.g., U0073): Communication errors between modules and sensors.

These codes are linked to different modules including:

• ECM (Engine Control Module)
• DPS (Dynamic Power Steering)
• Cluster (Digital Display)
• Smart-Lok (Traction Control Module)

How to View Can-Am Defender Fault Codes on Your Display

To check active fault codes without a diagnostic tool:

For 7.6" Digital Display:

1. Turn the key to the ON position.
2. Use the MENU button to navigate to CODES.
3. Hold the button to view any active codes.
4. The screen will scroll through up to 10 fault codes.

For 4.5" Digital Display:

1. Turn the key to ON.
2. Use the LOWER button to enter the CODES menu.
3. Hold to display fault codes.

Note: Only active codes can be viewed this way. For more detailed info, visit your local dealer who will use BRP's BUDS2 diagnostic software.

What to Do When a Can-Am Defender Fault Code Appears

1. Identify the code using the display
2. Check the system referenced by the code (engine, brakes, fuel, etc.).
3. Use OEM parts for repairs, such as sensors or fluid replacements.
4. Clear the code using BUDS2 after resolving the issue.
5. If unsure, consult your local Can-Am dealer or technician.

Top Can-Am Defender Fault Codes (and How to Fix Them)

P0101 – Mass Airflow Sensor Range/Performance Issue

What it means:

•  The Engine Control Module (ECM) has detected that the mass airflow sensor is reading values outside of expected parameters.
  

Common causes:

• Dirty or faulty mass airflow sensor (MAF)
• Air leaks in the intake system
• Clogged air filter

Fix:

• Clean or replace the MAF sensor
• Inspect and replace the air filter
• Check intake hoses for cracks or leaks

P0171 – System Too Lean (Bank 1)

What it means:

• The ECM has detected a lean fuel condition—too much air and not enough fuel.
  

Common causes:

• Vacuum leaks
• Weak fuel pump or clogged fuel filter
• Dirty or malfunctioning fuel injectors
• Faulty oxygen sensor

Fix:

• Inspect vacuum lines for cracks or disconnections
• Test fuel pressure and replace pump or filter if needed
• Clean or replace injectors
• Replace the upstream O2 sensor if faulty

P0335 – Crankshaft Position Sensor Circuit Malfunction

What it means:

• The ECM is not receiving proper signals from the crankshaft position sensor, which is critical for engine timing.
  

Common causes:

• Damaged or failed crankshaft position sensor
• Wiring issues (frayed, broken, or disconnected)
• Corroded connector

Fix:

• Inspect and replace the crankshaft position sensor
• Check the connector and wiring harness for damage
• Ensure the sensor is properly aligned

P0562 – System Voltage Low

What it means:

• The ECM has detected that the electrical system voltage is below the minimum threshold (typically under 10V).
  

Common causes:

• Weak or dead battery
• Failing alternator or regulator
• Corroded battery terminals or ground connections

Fix:

• Test and replace the battery if voltage is low
• Check alternator output and replace if not charging
• Clean and tighten all electrical connections

Tips for Preventing Can-Am Defender Fault Codes

• Stick to your Can-Am Defender service intervals
• Use OEM parts, especially sensors and electrical components
• Keep connectors clean and dry
• Use a Can-Am Defender service kit for routine maintenance tasks like oil changes and filter replacements

When your Can-Am Defender throws a fault code, don’t panic. Use this guide to diagnose and fix the issue quickly. Regular maintenance and a basic understanding of fault codes will keep your machine running strong for years to come.

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