2018 Ford Explorer Transmission Problems – Expert Diagnosis
The 2018 Ford Explorer is a robust family hauler, but owners often encounter shifting issues, hesitations, or strange noises from the drivetrain. This guide provides a detailed breakdown of common symptoms, DIY diagnostic steps, and professional repair options to help you keep your SUV on the road safely.
You rely on your Ford Explorer to get your family to school or your gear to the campsite without a hitch. It is incredibly frustrating when the vehicle begins to lunge, shudder, or refuse to shift into gear during your morning commute.
I promise to walk you through the most frequent 2018 Ford Explorer transmission problems and provide actionable solutions for each. We will look at everything from simple fluid refreshes to complex solenoid replacements and software recalibrations.
By the end of this article, you will know exactly how to identify a failing component and when it is time to visit a professional mechanic. Let’s dive into the mechanics of your Explorer’s 6-speed automatic system to get those smooth shifts back.
Understanding 2018 Ford Explorer transmission problems
The 2018 model year typically utilizes the 6F35 or 6F55 6-speed automatic transmission, depending on your engine choice. While these units are generally durable, they are prone to specific hydraulic and electronic glitches that can mimic mechanical failure.
Many owners report a “bump from behind” sensation when coming to a stop or a harsh engagement when shifting from Park to Drive. These issues often stem from the solenoid body or the transmission control module (TCM) rather than the gears themselves.
Identifying whether your issue is electronic or mechanical is the first step toward a cost-effective repair. We must distinguish between a simple software “relearn” process and a physical internal failure that requires a complete teardown.
The Role of the 6F35 and 6F55 Units
The 6F35 is found in the 2.3L EcoBoost and 3.5L Ti-VCT models, while the heavy-duty 6F55 handles the power of the 3.5L EcoBoost Sport and Platinum trims. Both units share a similar architecture but have different torque capacities and internal components.
Problems in these units often manifest as delayed engagement, where the engine revs up before the gear finally “slams” into place. This behavior puts immense stress on the motor mounts and internal clutches, leading to accelerated wear over time.
Identifying Early Warning Signs and Symptoms
Catching a transmission issue early can save you thousands of dollars in replacement costs. Listen for a whining sound that increases with engine RPM, which often indicates a clogged internal filter or a failing pump.
Pay close attention to the “Wrench Light” on your dashboard, as this is the primary indicator of a powertrain fault. Unlike the Check Engine Light, the wrench specifically points to performance issues within the engine or transmission management systems.
If you feel a vibration or shudder between 30 and 50 mph, you might be experiencing torque converter clutch (TCC) chatter. This often feels like you are driving over “rumble strips” on a smooth highway and is a classic symptom of fluid breakdown.
Hard Shifting and Lunging
Hard shifts usually occur when the transmission fluid is cold or when the pressure control solenoids become sticky. You might notice the vehicle lunging forward unexpectedly when downshifting as you approach a red light.
This erratic behavior is not just annoying; it can be a safety hazard in heavy traffic or off-road situations. Consistent harsh shifting is a clear sign that the transmission fluid is either low or severely contaminated with debris.
Loss of Power and Slipping
Transmission slipping occurs when the engine RPM increases, but the vehicle speed does not match the acceleration. You may feel the car “lose its grip” on the road, which is often caused by worn-out clutch plates or low hydraulic pressure.
If you experience a total loss of power while driving, pull over safely and check for fluid leaks under the vehicle. A ruptured transmission cooler line can drain the system in minutes, leading to a total mechanical shutdown.
Common Causes of Shifting Failures
The most common root cause of 2018 Ford Explorer transmission problems is the degradation of the transmission fluid. Over time, heat breaks down the additives in the Mercon LV fluid, reducing its ability to protect the moving parts.
Another frequent culprit is the lead frame or the internal wire harness, which can develop intermittent electrical shorts. These shorts confuse the TCM, leading to erratic shifting patterns or the vehicle “dropping” into neutral while at highway speeds.
We also see issues with the Power Transfer Unit (PTU) on All-Wheel Drive models, which can leak and mimic transmission smells. While the PTU is a separate gearbox, its failure is often misdiagnosed as a primary transmission fault by many owners.
Faulty Shift Solenoids
Shift solenoids act as the “gatekeepers” of hydraulic pressure within the valve body of your Explorer. When these small electro-mechanical valves fail or get clogged with metallic dust, they cannot route fluid to the correct gear set.
Replacing a single solenoid is possible, but most technicians recommend replacing the entire valve body if multiple codes are present. This ensures that all hydraulic pathways are clean and functioning at the correct factory pressures.
Software and Calibration Glitches
Modern transmissions rely heavily on “Adaptive Learning” software to adjust shifting based on your specific driving style. Sometimes, this software becomes corrupted or “learns” bad habits due to a dying battery or a faulty sensor.
A simple PCM/TCM update from a dealership can often resolve minor shifting hesitations without turning a single wrench. Always check for available software flashes before committing to expensive mechanical repairs on your 2018 Explorer.
DIY Maintenance: Checking and Changing Fluid
Checking the fluid in a 2018 Explorer is more difficult than in older cars because many do not have a traditional dipstick. You will likely find a small, short dipstick cap located deep in the engine bay, near the air filter box.
To get an accurate reading, the transmission must be at operating temperature, which usually requires a 15-minute drive. Use a scan tool to verify the transmission fluid temperature is between 185°F and 200°F before checking the level.
If the fluid appears dark brown or smells like burnt toast, it is time for a “drain and fill” service. Never use a high-pressure flush machine on a high-mileage Explorer, as this can dislodge debris and clog the sensitive valve body.
Steps for a Transmission Fluid Refresh
- Park the vehicle on a level surface and engage the parking brake for safety.
- Locate the drain plug on the bottom of the transmission pan and place a catch basin underneath.
- Remove the plug and allow roughly 4 to 5 quarts of Mercon LV fluid to drain out completely.
- Reinstall the drain plug with a new crush washer and tighten it to the factory torque spec.
- Refill the system through the dipstick port using a long-neck funnel to avoid spills.
Always use the exact fluid specified in your owner’s manual to ensure compatibility with the internal seals. Using the wrong fluid can lead to seal swelling and catastrophic internal pressure loss within a few hundred miles.
Technical Service Bulletins and Software Updates
Ford has issued several Technical Service Bulletins (TSBs) regarding 2018 Ford Explorer transmission problems. These bulletins provide dealership technicians with specific “recipes” to fix known issues like the 1-2 upshift shudder.
One notable TSB involves the replacement of the torque converter if a specific vibration is felt during steady-state cruising. If your vehicle is still under the powertrain warranty, these repairs may be covered at no cost to you.
Ask your service advisor to check for “Field Service Actions” or “Customer Satisfaction Programs” linked to your VIN. Sometimes, Ford extends the warranty on specific components like the internal lead frame if they see a high failure rate in the field.
Repair Costs and Professional Replacement
The cost of managing 2018 Ford Explorer transmission problems varies wildly depending on the severity of the internal damage. A simple software reflash might cost $150, while a solenoid replacement usually runs between $600 and $900.
If the internal clutches are burnt or the metal gears are damaged, a full rebuild is the only long-term solution. A professional rebuild typically costs between $3,500 and $4,500, including labor and a new torque converter.
For those who need their vehicle back quickly, a remanufactured transmission is a great option. These units come pre-assembled with all the latest updates and often include a 3-year, unlimited-mileage warranty for peace of mind.
When to Call a Professional
If you find large metal chunks in the transmission pan during a fluid change, stop immediately and call a pro. Metal fragments indicate that a hard part, like a planet gear or a bearing, has physically disintegrated inside the case.
Attempting to drive a vehicle with a “grenaded” transmission can cause the unit to seize, potentially locking the front wheels. Safety is the priority; use a flatbed tow truck if the vehicle is making loud grinding or metal-on-metal noises.
Frequently Asked Questions About 2018 Ford Explorer transmission problems
How often should I change the transmission fluid in my 2018 Explorer?
While Ford suggests longer intervals, most experts recommend a drain and fill every 30,000 to 50,000 miles. This is especially important if you use your Explorer for towing or frequent stop-and-go city driving.
Can a bad battery cause transmission shifting issues?
Yes, modern Ford transmissions are highly sensitive to voltage drops. A weak battery can cause the TCM to reset or send “garbage” data to the solenoids, resulting in erratic shifts or false error codes.
What is the difference between a transmission flush and a fluid change?
A fluid change involves draining the pan and replacing about 40% of the fluid. A flush uses a machine to replace nearly 100% of the fluid, but it can be risky for older transmissions with existing wear.
Is there a recall for the 2018 Ford Explorer transmission?
There have been recalls for related components like the linkage cables and parking pawls, but not a universal recall for the entire transmission. Check your VIN on the NHTSA website to see if your specific vehicle is affected.
Why does my Explorer jerk when I put it in Reverse?
This is often caused by a worn rear motor mount or a faulty EPC (Electronic Pressure Control) solenoid. High idle speed during a cold start can also make the engagement feel much harsher than normal.
Final Thoughts on Maintaining Your Explorer
Dealing with 2018 Ford Explorer transmission problems requires a mix of proactive maintenance and smart diagnostics. By staying on top of fluid changes and addressing “wrench lights” immediately, you can avoid the high cost of a total replacement.
Remember that the transmission is a complex system that relies on clean fluid, steady voltage, and updated software. If your DIY efforts don’t solve the shudder or the slip, don’t hesitate to consult a certified technician who has the specialized tools to read manufacturer-specific codes.
Keep your Explorer healthy by listening to what it tells you on the road. Stay safe, keep your fluid clean, and enjoy the drive!
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