Ford Explorer AWD – Troubleshooting, Maintenance, And Off-Road
The Ford Explorer AWD system uses an Intelligent 4WD setup that monitors road conditions in real-time to distribute torque between the front and rear axles. This guide explains how the system functions, identifies critical maintenance like PTU fluid changes, and provides troubleshooting steps for common drivetrain faults.
You rely on your Ford Explorer to handle everything from rain-slicked highways to dusty weekend trails. Whether you are hauling the family or heading to a remote campsite, understanding your ford explorer awd system is the key to vehicle longevity and safety.
In this guide, we will break down how the Intelligent 4WD mechanics work and why the “lifetime” fluid claim might be a risk to your drivetrain. We will also look at the common “AWD Fault” warnings and how you can address them in your own garage.
By the end of this article, you will have a professional technician’s perspective on keeping your drivetrain smooth and responsive. Let’s dive into the nuts and bolts of what makes your Explorer a capable all-weather machine.
How the Ford Explorer AWD System Functions
The modern Ford Explorer does not use a traditional, heavy-duty transfer case like a dedicated 4×4 truck. Instead, it utilizes an Intelligent All-Wheel Drive system that stays active at all times, making decisions for you in milliseconds.
The heart of this system is the Power Transfer Unit (PTU). This small gearbox is bolted to the transmission and redirects power to the rear wheels via a driveshaft. It is a compact design that allows the vehicle to remain fuel-efficient while providing on-demand traction when sensors detect wheel slip.
The vehicle’s computer monitors dozens of data points, including throttle position, steering angle, and individual wheel speeds. If the front wheels lose grip, the system engages an electromagnetic clutch in the Rear Drive Unit (RDU) to send power to the back. This seamless transition is what keeps you moving forward in challenging weather conditions.
Intelligent 4WD vs. Traditional 4×4
It is important to distinguish this system from a “true” 4WD system with a low-range gear. The Explorer is designed for high-speed stability and light-to-moderate off-roading rather than extreme rock crawling. The lack of a 4-Lo setting means you rely heavily on electronic brake-traction control to manage power delivery.
The benefit of this setup is weight reduction and better handling on dry pavement. You do not have to manually engage a lever or button to get out of a slippery driveway. The car does the thinking, allowing you to focus on the road ahead.
Essential Maintenance for Your Ford Explorer AWD
Proper maintenance is the difference between a 200,000-mile drivetrain and a catastrophic failure at 80,000 miles. Many owners are surprised to learn that certain components require more frequent care than the official manual suggests. To keep your ford explorer awd performing correctly, you must look beyond the basic oil change.
The most debated component is the PTU. Ford originally marketed the PTU fluid as “filled for life.” However, experienced mechanics have found that the fluid can break down due to its proximity to the hot exhaust manifold. Over time, the oil turns into a thick, black sludge that eventually leads to bearing failure or gear damage.
We recommend changing the PTU fluid every 30,000 to 50,000 miles, especially if you tow trailers or drive in hilly terrain. This simple fluid swap can save you thousands of dollars in replacement costs. Similarly, the Rear Drive Unit (RDU) requires periodic fluid inspections to ensure the clutch packs stay lubricated and cool.
The Importance of Tire Matching
One of the most overlooked aspects of AWD maintenance is tire uniformity. Because the system calculates slip based on wheel speed, all four tires must have the same diameter. If you replace only two tires, the difference in tread depth can trick the computer into thinking the wheels are slipping.
This “false slip” causes the AWD system to engage constantly on dry pavement. This creates excessive heat in the PTU and RDU, leading to premature mechanical wear. Always rotate your tires every 5,000 miles and replace them in sets of four to protect your investment.
Troubleshooting Common Ford Explorer AWD Problems
When something goes wrong, your dashboard will likely display a message like “AWD Fault” or “AWD Off.” These messages are generic, meaning they could indicate anything from a simple sensor glitch to a mechanical failure. When diagnosing a ford explorer awd issue, start with the easiest fixes first.
A common culprit for AWD warnings is a faulty wheel speed sensor. If a sensor is covered in road grime or the wiring is damaged, the computer loses the data it needs to manage torque. Cleaning the sensors or replacing a $30 part is often all it takes to restore full functionality.
Another frequent issue involves the PTU temperature sensor. If the fluid gets too hot, the system will temporarily disable AWD to prevent damage. If you see the “AWD Off” message during a long highway climb, it may be a sign that your fluid is degraded and needs immediate replacement.
Identifying PTU Leaks
You should periodically crawl under your vehicle with a flashlight to inspect the PTU housing. Look for signs of “weeping” oil where the driveshafts enter the unit. A small leak can quickly lead to a dry gearbox, which will seize and potentially crack the housing.
If you smell a pungent, burnt-sulfur odor after driving, it is a classic sign of leaking PTU fluid hitting the hot exhaust. Do not ignore this smell. Address the seals immediately to avoid a total drivetrain lockup while driving.
Off-Road Performance and Terrain Management
While it isn’t a dedicated rock-bouncer, the Explorer is surprisingly capable on forest service roads and beach sand. This capability is driven by the Terrain Management System (TMS). This dial on the center console allows you to “tune” the AWD system for specific environments.
In “Sand Mode,” the system allows for more wheel spin to keep momentum and prevents the engine from bogging down. In “Mud/Ruts Mode,” the computer aggressively manages torque to find grip in uneven terrain. Using these modes correctly reduces the mechanical stress on the clutches by pre-loading the AWD system before you even start moving.
If you plan on frequent off-road excursions, consider upgrading to an All-Terrain (A/T) tire. The stock highway tires are designed for quietness and fuel economy, but they lack the sidewall protection and bite needed for muddy trails. A set of quality A/T tires will transform how the AWD system performs in the dirt.
Safe Off-Roading Practices
Even with the best AWD system, you can still get stuck. Always carry a basic recovery kit, including a tow strap, a shovel, and traction boards. If you find yourself in deep mud and the “AWD Fault” light triggers, stop immediately. The system is likely overheating from excessive wheel spin.
Let the vehicle cool down for 20 minutes before attempting to move again. If the light persists, you may have damaged a sensor or overheated the PTU fluid. In these cases, it is safer to call for a professional recovery rather than risking further damage to the transmission.
DIY Guide: Changing PTU Fluid
If you are a weekend DIYer, changing the PTU fluid is one of the best things you can do for your Explorer. On many models, there is no drain plug, which makes this a bit tricky. You will need a fluid extraction pump and a few basic tools.
- Safety First: Raise the vehicle using a floor jack and secure it with four jack stands. Never work under a car supported only by a jack.
- Locate the Fill Plug: The PTU is located on the passenger side of the engine bay, tucked behind the exhaust. Remove the fill plug using a 3/8-inch ratchet or a specialized low-profile tool.
- Extract the Old Fluid: Insert the extraction tube into the fill hole. Pump out as much of the old, thick fluid as possible. It may take some maneuvering to get the tube to the bottom of the case.
- Refill: Use a high-quality 75W-140 synthetic gear oil. Pump the new fluid in until it starts to weep out of the fill hole.
- Seal it Up: Clean the fill plug, apply a small amount of thread sealant, and tighten it back into place.
By performing this preventative maintenance, you ensure that the gears stay lubricated and the internal temperatures remain stable. It is a messy job, but it is much cheaper than a $2,500 PTU replacement at the dealership.
Upgrading Your Explorer for Better Traction
If you find the factory ford explorer awd performance lacking, there are several ways to boost its capability. Beyond tires, consider upgrading your brake pads. Since the AWD system uses “brake torque vectoring” to stop spinning wheels, having high-friction pads can improve the system’s reaction time in the snow.
Suspension upgrades can also help. A mild leveling kit or lift kit provides extra ground clearance, preventing the underbody from high-centering on snow banks or rocks. However, be mindful that changing suspension geometry can sometimes put extra stress on the CV axles.
For those who live in extreme winter climates, a dedicated set of winter tires is unbeatable. Even the most advanced AWD system is limited by the physical grip of the rubber on the ice. Winter tires use a softer compound that stays flexible in sub-zero temperatures, allowing the AWD system to maximize every bit of traction available.
Frequently Asked Questions About Ford Explorer AWD
Is the Ford Explorer AWD full-time or part-time?
The Ford Explorer uses an Intelligent AWD system that is technically “full-time” because it is always active and monitoring data. However, it primarily sends power to the front wheels during normal cruising to save fuel. It only sends significant torque to the rear wheels when it detects a need for extra traction or stability.
What does the “AWD Fault” light mean?
This light indicates that the computer has detected an issue within the drivetrain system. It could be a failed sensor, an overheated PTU, or a communication error between modules. You should use an OBD-II scanner to read the specific trouble codes stored in the vehicle’s computer to identify the exact component that is failing.
Can I tow a trailer with my AWD Explorer?
Yes, the Ford Explorer is a very capable towing platform. However, towing increases the heat load on the PTU and transmission. If you tow frequently, you should follow the “Severe Weather” maintenance schedule, which includes more frequent fluid changes for the AWD components and the cooling system.
Does the AWD system require special tires?
You do not need “special” tires, but you must ensure that all four tires are the same brand, model, and size. Significant differences in tread wear between the front and rear axles can cause the AWD system to engage unnecessarily, leading to mechanical strain and decreased fuel economy.
Conclusion: Keeping Your Explorer Ready for Anything
The ford explorer awd system is a sophisticated piece of engineering that provides confidence in a variety of driving conditions. By understanding its limitations and staying ahead of maintenance, you can enjoy a reliable and capable vehicle for years to come.
Remember that the “lifetime” fluid labels are often optimistic. Take control of your vehicle’s health by inspecting your PTU and RDU regularly. Whether you are navigating a blizzard or exploring a new trail, a well-maintained drivetrain is your best friend on the road.
Stay proactive with your maintenance, keep your tires matched, and don’t be afraid to get your hands a little dirty in the garage. Your Explorer was built for adventure—make sure it stays ready for the next one. Stay safe and stay comfortable!
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