Do Subaru Outbacks have CV axles?

Yes. Subaru Outbacks use constant-velocity (CV) axles as part of their symmetrical all-wheel-drive system, with CV joints connecting the wheels to the drivetrain on both the front and rear axles.

Understanding Subaru's all-wheel-drive and CV axles

In an Outback, power from the engine goes through the transmission to a center differential. From there, torque is distributed to the front and rear wheels via CV axles. The front wheels are connected by front CV axles, and the rear wheels by rear CV axles. Each axle uses CV joints (inner and outer) to accommodate suspension movement while transmitting rotational force to the wheels. This arrangement enables continuous power delivery as you drive over varying road conditions.

Front and rear CV axles explained

There are four CV axles in a typical Outback: two front axles that connect the transaxle to the front hubs, and two rear axles that connect the center drivetrain to the rear hubs. Each axle has inner and outer CV joints that maintain a constant velocity as the wheels move through bumps and turns. The boots seal each CV joint with grease to keep contaminants out and lubricate the joint.

Note: While all Outbacks use CV axles, exact drivetrain details can vary by model year and market. Always refer to your owner’s manual for specifics on your vehicle’s AWD architecture.

How to recognize wear and when to service

Understanding typical signs of CV axle wear can help you catch problems early and avoid further damage to the driveline. The following indicators are commonly observed by owners and technicians.

Common signs of CV axle wear include:

• Clunking or clicking noises when turning, especially at low speeds, pointing to a worn outer CV joint.


• Vibration or shuddering during acceleration, which can indicate a worn joint or an imbalanced axle.


• Grease leakage or a torn/broken CV boot, visible as grease around the wheel area or under the vehicle.


• Unusual steering feel or binding during turns, which may signal joint issues.

Conclusion: If you notice any of these symptoms, have a mechanic inspect the CV axles promptly to prevent further driveline damage.

Maintenance and care for CV axles

Regular inspection of CV boots and joints is key to extending the life of CV axles in a Subaru Outback. The boot is the first line of defense—keeping grease in and contaminants out—and damage to the boot is the most common cause of CV joint failure.

Maintenance and care steps:

• Inspect CV boots for cracks, splits, or tears during routine service or tire rotations. Replace torn boots promptly to prevent grease loss and contamination of the joint.


• Check for dampness or grease around the wheel hubs, which can indicate a leaking CV boot.


• Listen for irregular noises during turning or acceleration that could signal a failing CV joint or axle.


• Avoid aggressive impacts (like curbs or potholes) that can damage CV joints or boots.


• Replace a damaged CV axle or boot as soon as possible to avoid further drivetrain damage.

Conclusion: Proper inspection and timely boot or axle replacement help maintain AWD reliability across model years.

Summary

Subaru Outbacks rely on CV axles as a core part of their symmetrical all-wheel-drive system. With front and rear CV axles connecting the hubs to the center differential, these components enable continuous power delivery as the suspension moves. Regular boot inspections and prompt replacement of damaged joints help maintain AWD reliability across model years.

Do subarus have CV axles?

Your Subaru's CV axles are what transfer power from the transmission to the wheels in order to drive the vehicle forward. Normal wear on the CV axles will cause them to wear out over time and they will eventually and need to be replaced.

How long do CV axles last on a Subaru?

Subaru CV axles typically last 80,000 to 100,000 miles or more under normal driving conditions, but their lifespan can vary significantly based on factors like maintenance and driving habits. Key to their longevity is preventing boot failure, as a torn boot leads to grease loss and contamination, which will accelerate wear and cause the axle to fail prematurely.
 
Factors affecting CV axle lifespan

• Boot integrity: A torn CV boot is the most common cause of failure. If the rubber boot tears, it allows grease to escape and dirt to enter, quickly destroying the joint. 
• Driving conditions: Aggressive driving, harsh off-road conditions, and exposure to road salt and other road treatments can shorten the lifespan of CV axles. 
• Axle type: Authentic Subaru OEM (Original Equipment Manufacturer) axles are generally very robust and long-lasting, while some aftermarket axles may fail much sooner. 

Signs of a failing CV axle

• Clicking or popping noises: A rhythmic clicking sound, especially when turning, is the most common symptom. 
• Vibration: A vibration that gets worse at higher speeds can indicate a worn or unbalanced axle. 
• Grease on the wheels: If you see grease splashed on the inside of your wheels, it's likely from a split CV boot. 
• Clunking: A clunking or knocking sound when accelerating or decelerating can also signal a worn-out joint. 

What you can do

• Regular inspections: Have your mechanic inspect the CV boots for any signs of wear or tears during routine maintenance. 
• Replace boots, not axles: If a boot is torn but the axle is otherwise healthy, replace just the boot. This is often a more cost-effective solution than replacing the entire axle. 
• Choose quality parts: If an axle does need to be replaced, consider using genuine Subaru OEM or a high-quality remanufactured OEM part to ensure a longer service life. 

What is a common problem with a Subaru Outback?

Common problems reported for the Subaru Outback include weak windshields prone to cracking, excessive oil consumption, and issues with the continuously variable transmission (CVT). Other common problems can include airbag defects, oxygen sensor failure, premature brake wear, electrical issues, and head gasket failure on older models. 
Mechanical and engine issues 

• Oil Consumption: Many models, particularly older 2.5L engines, are known to burn oil between service intervals. 
• Head Gasket Failure: This was a widespread issue in older models (roughly 1997-2012) with the EJ series engines, though newer models are less affected. 
• CVT Transmission Problems: Issues like rough shifting, vibration, and delayed acceleration have been reported, particularly in models from 2010–2013. 
• Suspension Wear: Suspension components can experience premature wear and tear. 
• Premature Brake Wear: Some owners report that the brakes wear out faster than expected. 

Electrical and other component issues

• Faulty Airbags: Some model years have been subject to recalls and complaints about defective airbags. 
• Weak Windshields: Subaru Outbacks are frequently cited for weak windshields that are prone to cracking or chipping without a significant impact. 
• Electrical and Battery Issues: Problems include unexpected battery drain and general electrical faults. 
• Oxygen Sensor Failure: This is a common problem in many Subaru models. 
• Cooling System Failure: Problems with the cooling system have been reported in some model years. 

Do AWD vehicles have CV axles?

Front-wheel drive vehicles have two CV axles – one that connects each of the front wheels to the transmission while AWD vehicles have four CV axles – two that connect the front wheels to the transmission and two that attach the back wheels to the rear differential.