2025 Ford Expedition Wiper Transmission: Linkage Failures and Wiper Arm Issues Explained
A deep dive into the wiper transmission and related arm problems for the 2025 Ford Expedition, including symptoms, recalls on prior years, and what to check on a used part.
- A major recall (26S24) on 2021-2023 Expeditions for stripping wiper *arms* is highly relevant; inspect the transmission's pivot splines for related damage.
- The most common failure symptoms are wipers moving out of sync or not moving at all while the motor can still be heard running.
- When buying a used transmission, the most critical inspection is checking the pivot post splines for any signs of stripping or damage.
- Replacement is a moderately easy DIY job, but a special wiper arm puller tool is highly recommended to avoid damage.
Known Issues, Recalls, and Generation-Specific Information
While the 2025 Ford Expedition is a new model, it is mechanically similar to the 2022-2024 models. As of mid-2026, there are no recalls or Technical Service Bulletins (TSBs) specifically for the wiper transmission on the 2025 Expedition. However, a significant recall on prior model years is highly relevant.
Ford Safety Recall 26S24: Wiper Arm Spline Failure
Important Context: Ford issued a recall (26S24) for 2021-2023 Ford Expedition and Lincoln Navigator models due to defective windshield wiper *arms*. The problem is that the splines inside the wiper arm head—the teeth that grip onto the pivot post of the wiper transmission—can strip. This can cause the wipers to move erratically, stop working, or even detach from the vehicle, especially under load (like heavy snow or high speeds).
While this recall technically applies to the wiper arms and not the transmission itself, it directly involves the connection point between the two parts. A stripped wiper arm can damage the splines on the transmission's pivot post, potentially requiring the replacement of both components. When diagnosing wiper issues on a 2025 model, or inspecting a used part, it's critical to check both the arm and the transmission pivot for this type of damage. Ford identified the issue as stemming from improper manufacturing of the wiper arm and dimensional variability in the components.
Symptoms of a Failing Wiper Transmission
A bad wiper transmission has very distinct symptoms. If you hear the wiper motor running but the wipers aren't moving correctly, the linkage is the most likely culprit.
- Wipers Moving Out of Sync: One wiper moves correctly while the other lags, moves a shorter distance, or doesn't move at all. This often happens when a plastic bushing fails or a linkage arm pops off its ball joint.
- Jerky or Stuttering Motion: The wipers hesitate or chatter as they move across the glass instead of making a smooth, continuous sweep. This can be caused by worn pivot points creating excessive play in the linkage.
- Wipers Won't Park Correctly: When you turn the wipers off, they stop in the middle of the windshield or in a random position instead of returning to the base of the cowl. This points to a problem within the transmission or the motor's internal parking switch.
- Grinding or Clicking Noises: Loud mechanical sounds coming from the cowl area when the wipers are on indicate metal-on-metal contact from a broken or disconnected linkage arm.
- One Wiper Not Working: Often, the driver's side wiper will work while the passenger's side is stationary. This is a classic sign that the linkage arm connecting to the passenger side pivot has broken or disconnected.
Buying a Used Wiper Transmission: What to Inspect
A used OEM wiper transmission is an excellent, cost-effective alternative to an expensive new part, but careful inspection is key. Since the part is purely mechanical, you can easily spot signs of wear or damage.
- Inspect the Pivot Post Splines: This is the most important check for this vehicle generation. The splines on the two pivot posts (where the wiper arms mount) should be clean, sharp, and well-defined. Run your finger over them. If they feel rounded, flattened, or stripped, the part has been damaged, likely by a faulty wiper arm as described in the recall. Do not buy a transmission with damaged splines.
- Check All Pivot Points for Play: Hold the main frame of the transmission and try to wiggle each joint and pivot. There should be very little slack or play. Excessive looseness means the bushings are worn out, and the wipers will move erratically.
- Look for Corrosion: Check the pivot points where the shafts rotate within their housings. Heavy rust or corrosion can cause the pivots to bind and seize, putting a huge strain on the wiper motor. The movement should be smooth, not stiff or gritty.
- Examine Plastic Bushings: The linkage arms often connect to ball studs via small plastic bushings or sockets. Make sure these are not cracked, brittle, or missing. This is a common failure point, and while some are repairable, it's best to find a unit with intact bushings.
- Confirm Part Numbers: If possible, match the OEM part number. Part numbers for this generation include JL3Z-17566-A and ML3Z-17566-B. Buying the complete assembly with the motor attached, like a used unit from a 2022-2024 model, can ensure compatibility and is often a simpler replacement.
Pro Tip: When removing the old wiper arms, they can be seized onto the pivot splines. A small battery terminal puller or a dedicated wiper arm puller tool can pop them off easily without damaging the cowl or the transmission.
Cost Comparison
| Part Type | Estimated Cost |
|---|---|
| New OEM (Ford) | $150 - $200 |
| New Aftermarket | $70 - $150 |
| Used OEM | $75 - $125 |
| Shop Labor | $95 - $150 |
Frequently Asked Questions (FAQ)
Is it difficult to replace a wiper transmission?
Replacement is moderately difficult and considered a feasible DIY job for someone with basic mechanical skills. It involves removing the wiper arms, the plastic cowl cover, unplugging the motor, and unbolting the assembly. The trickiest parts are removing the wiper arms without damage and carefully unclipping the plastic cowl. The installation difficulty is about a 3 out of 5.
My wipers are acting weird. Is it the transmission, the motor, or the recall issue?
It can be tricky. If you hear the motor running but the wipers move erratically or not at all, the transmission (linkage) is the likely cause. If you hear nothing at all, the problem is more likely the motor, fuse, or switch. If the wipers seem loose, operate erratically, or one has detached, check if the nut holding the wiper arm is tight and inspect the splines on both the arm and the transmission pivot post for stripping, which relates to the recall on earlier models.
Can I just replace a broken plastic bushing instead of the whole transmission?
On some older vehicles, aftermarket companies sold replacement bushings. However, for most modern vehicles like the Expedition, these bushings are not designed to be serviced separately. The most reliable and long-lasting repair is to replace the entire wiper transmission assembly.
Does a new wiper transmission need to be programmed?
No. The wiper transmission is a purely mechanical part. There are no electronics or programming involved in the linkage itself. All control functions are handled by the wiper motor and the vehicle's body control module.
Technical Specifications
OEM Part Numbers: ML3Z-17566-B JL3Z-17566-A FL3Z-17566-A
The wiper transmission is a mechanical linkage assembly, typically made of stamped steel with plastic bushings and pivot points. It is located between the firewall and the plastic cowl cover.
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Ford Expedition: