2006 Nissan Murano Rear Subframe Recall

The 2006 Nissan Murano is a crossover SUV known for its comfortable ride and distinctive styling. However, one issue that plagued many of these vehicles was a significant rear subframe corrosion problem, leading to a recall. This article provides a detailed look at the recall, its causes, the affected vehicles, and what you, as an experienced DIYer or car enthusiast, need to know.

Understanding the 2006 Murano Rear Subframe Recall

The recall, designated by Nissan as Recall Campaign Number 09V-116, addressed a potentially dangerous situation where excessive corrosion could weaken the rear subframe to the point of failure. This failure could compromise vehicle handling and increase the risk of a crash. The recall specifically targeted vehicles originally sold or currently registered in specific "salt belt" states – those with significant road salt usage during winter months.

What is the Rear Subframe?

Before diving deeper, let's define what the rear subframe is. Also sometimes referred to as a rear crossmember, cradle, or rear chassis, the rear subframe is a structural component that supports the rear suspension, differential (on all-wheel-drive models), and other rear-mounted components. It’s typically a welded steel structure designed to provide rigidity and isolate road noise and vibrations from the passenger cabin. Think of it as the backbone of the rear suspension system.

The subframe is critical for maintaining proper wheel alignment and handling characteristics. If the subframe is compromised, it can lead to:

Poor handling: The vehicle may feel unstable, especially during cornering or braking.
Excessive tire wear: Misalignment caused by a weakened subframe can cause tires to wear unevenly and prematurely.
Strange noises: Creaking, groaning, or clunking sounds coming from the rear of the vehicle.
Component failure: The weakened subframe can put undue stress on other suspension components, leading to their failure.

The Root Cause: Corrosion

The primary culprit behind the recall was corrosion, specifically caused by the prolonged exposure to road salt. In regions where salt is heavily used to de-ice roads, the salty water can splash onto the undercarriage of vehicles, including the rear subframe. Over time, this repeated exposure can penetrate the protective coatings on the subframe and initiate the corrosion process. While all metals are susceptible to corrosion, the type of steel used in the subframe and the effectiveness of its initial coating play a significant role in its resistance.

The 2006 Murano's subframe design and the factory corrosion protection applied were deemed inadequate to withstand the harsh conditions in high-salt environments. The areas most susceptible to corrosion were typically around weld seams, mounting points, and areas where debris could accumulate, trapping moisture and salt.

Identifying Affected Vehicles

The recall wasn't a blanket recall for all 2006 Muranos. It was geographically targeted, focusing on vehicles registered in states with heavy road salt usage. To determine if your vehicle was affected, you needed to:

Check your Vehicle Identification Number (VIN): The easiest way was to enter your VIN on the Nissan USA website (specifically their recall lookup tool) or the National Highway Traffic Safety Administration (NHTSA) website. These websites provide real-time information about any outstanding recalls for your specific vehicle.
Contact your local Nissan dealership: A Nissan dealership could also use your VIN to check for any open recalls.

The recall generally affected vehicles originally sold or registered in states like: Connecticut, Delaware, Illinois, Indiana, Iowa, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, Missouri, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, West Virginia, and Wisconsin. However, even if your vehicle wasn't initially registered in one of these states, it could still be affected if it was subsequently moved to one of these locations.

The Recall Remedy

The remedy offered by Nissan under the recall varied depending on the severity of the corrosion:

Inspection: All vehicles brought in under the recall were first inspected for corrosion. A Nissan technician would visually examine the rear subframe for signs of rust, scale, and structural weakening.
Corrosion Protection Application: For vehicles with only minor surface corrosion, Nissan applied a corrosion-resistant coating to the subframe to prevent further degradation. This coating was designed to seal the existing rust and provide a barrier against future salt exposure.
Subframe Replacement: If the inspection revealed significant corrosion that compromised the structural integrity of the subframe, Nissan would replace the entire rear subframe free of charge. This involved disconnecting the rear suspension components, differential (on AWD models), and other related parts and transferring them to the new subframe.

Important Note: Even if the vehicle was initially inspected and received the corrosion protection application, owners were advised to have the subframe re-inspected periodically, especially if they continued to drive in high-salt environments. The applied coating offered protection, but it wasn't a permanent solution against continued exposure.

DIY Inspection and Preventative Measures

Even if the recall has already been addressed on your 2006 Murano, it’s a good idea to periodically inspect the rear subframe yourself, especially if you live in a region where road salt is used. Here's what to look for:

Visual Inspection: Use a flashlight to thoroughly inspect the subframe for signs of rust, especially around weld seams, mounting points, and areas where debris can accumulate. Look for flaking, pitting, or areas where the metal appears to be thinning. A small inspection mirror can help reach difficult-to-see areas.
Sounding: Tap the subframe with a small hammer or screwdriver handle. A solid, ringing sound indicates good metal. A dull, thudding sound may indicate hidden corrosion. Be careful not to strike too hard, as you don't want to damage the subframe.
Penetration Test (Use with Extreme Caution): This test is only recommended if you suspect significant corrosion. Using a small awl or pick, carefully try to probe areas of suspected corrosion. If the awl easily penetrates the metal, it indicates significant weakening. Again, be extremely cautious with this test to avoid further damaging the subframe. If you are unsure, seek professional inspection.

If you detect corrosion, there are several preventative measures you can take:

Undercoating: Applying a quality undercoating to the subframe can provide an extra layer of protection against salt and moisture. Ensure the undercoating is specifically designed for automotive use and is compatible with the existing coatings on the subframe. Proper surface preparation is critical for the undercoating to adhere properly.
Regular Washing: Wash your vehicle regularly, paying particular attention to the undercarriage, especially during the winter months. Use a pressure washer or a car wash with an undercarriage wash feature.
Rust Converter: For areas with minor surface rust, you can use a rust converter to neutralize the rust and prevent it from spreading. Follow the manufacturer's instructions carefully.
Drainage: Ensure that drain holes in the subframe are clear of debris to allow water to drain properly.

Aftermarket Solutions

While Nissan addressed the issue under the recall, some owners have explored aftermarket solutions for additional protection or as a replacement option if the recall repair wasn't satisfactory or if the vehicle is now outside the recall eligibility period. Several companies offer aftermarket subframes or reinforcement kits designed to improve corrosion resistance and structural integrity.

Important Considerations When Considering Aftermarket Subframes:

Quality and Materials: Ensure that the aftermarket subframe is made from high-quality steel and has a durable corrosion-resistant coating. Look for reviews and certifications from reputable organizations.
Fit and Compatibility: Verify that the subframe is specifically designed for the 2006 Nissan Murano and is compatible with your vehicle's drivetrain (FWD or AWD).
Installation: Subframe replacement is a complex procedure that requires specialized tools and knowledge. Unless you have extensive mechanical experience, it's best to have the installation performed by a qualified mechanic.

Conclusion

The 2006 Nissan Murano rear subframe recall highlighted the importance of corrosion protection, especially in vehicles operating in harsh environments. By understanding the causes of the problem, identifying affected vehicles, and taking appropriate preventative measures, you can help ensure the safety and longevity of your Murano. As an informed DIYer, you are now equipped with the knowledge to inspect your vehicle, understand the recall procedures, and explore potential solutions to mitigate the risks associated with subframe corrosion. Always prioritize safety and consult with a qualified mechanic if you have any concerns about the condition of your vehicle.