Best Replacement Parts for a Vibrating Wiper Motor

A vibrating wiper motor assembly is more than an annoyance. It shakes your steering wheel, rattles your dashboard, and can wear down connected components over time if you ignore it. Replacing worn or imbalanced parts in the assembly restores smooth operation and prevents bigger, costlier problems down the road. If you've landed here, you're likely dealing with a noticeable vibration and want to know which replacement parts actually fix it not just slap a bandage on it.

What parts make up a vibrating wiper motor assembly?

Before you can choose the right replacement parts, it helps to understand what's inside the assembly. A typical wiper motor assembly includes the motor itself, the wiper linkage (also called the wiper transmission), the mounting bracket and bushings, the crank arm, and the wiper arms and blades. Each of these components can contribute to vibration if it's worn, cracked, or out of balance.

The motor contains internal gears and an armature that spins at high speed. When those gears wear down or the armature becomes unbalanced, you'll feel a rhythmic shaking especially at highway speeds. The linkage connects the motor to the wiper arms through a series of pivot points, and worn pivot bushings are one of the most common culprits behind vibration.

Why does my wiper motor assembly vibrate in the first place?

Vibration usually traces back to one of three problems: imbalance in the motor's rotating assembly, worn linkage bushings, or a loose or damaged mounting bracket. If you want to narrow it down, this breakdown of what causes vibration in the steering wheel when wipers are on walks through the specific mechanical causes.

Age and weather exposure accelerate wear. Rubber bushings dry out and crack. Metal pivot pins corrode and develop play. Even the grease inside the motor housing dries up over years, increasing friction and contributing to uneven rotation.

Which replacement parts should I buy first?

Start with the parts most likely to fail. Here's what experienced mechanics and DIYers replace most often when dealing with a vibrating wiper motor assembly:

Wiper linkage bushings

These small rubber or nylon bushings sit at every pivot point in the linkage. They're cheap usually $5–$15 for a full set and they're the number one cause of vibration in older vehicles. When they wear, they create play in the linkage that translates into a visible and audible shake.

Wiper motor

If the motor's internal armature or gears are worn, no amount of bushing replacement will fix the vibration. Rebuilt or remanufactured motors from brands like Cardone or BWD Automotive are reliable and typically cost $40–$120 depending on your vehicle. New OEM motors run higher but come with the best fitment guarantees.

Wiper motor mounting bracket and grommets

The bracket bolts the motor assembly to the firewall or cowl. If the rubber grommets between the bracket and the body are deteriorated, the whole assembly vibrates against the metal body of the car. Replacement grommets are inexpensive and easy to swap.

Crank arm

The crank arm converts the motor's rotational motion into the back-and-forth motion of the linkage. If it's bent or the splines are stripped, you'll get uneven movement and vibration. Inspect it when you have the assembly apart.

How do I test my wiper motor before buying parts?

Don't guess. Test first so you only buy what you actually need. You can test a car wiper motor for imbalance and vibration with basic tools in your garage. A simple bench test with the motor removed from the car will tell you if the motor itself is the problem or if the issue lies in the linkage and mounting hardware.

You can also diagnose whether the wiper motor is causing your steering wheel shake without removing anything. Running the wipers at different speeds while parked and observing the assembly for visible wobble can point you in the right direction.

OEM vs. aftermarket replacement parts which is better?

OEM parts match the original spec exactly. They fit without modification and tend to last longer because the materials match what the manufacturer intended. The downside is cost and availability some OEM parts are dealer-only and marked up significantly.

Aftermarket parts from reputable suppliers work well for most drivers. The key is choosing quality brands. For wiper motors, look for remanufactured units with a warranty of at least one year. For linkage bushings, nylon replacements from companies like Dorman often outlast the original rubber ones.

What are the most common mistakes people make?

Replacing only the wiper arms or blades. If the vibration is coming from the motor or linkage, new arms won't fix anything. This wastes money and delays the real fix.
Skipping the linkage bushings. Many people go straight for a new motor when a $10 set of bushings would have solved the problem. Always check the bushings first.
Not torquing the mounting bracket bolts properly. Loose bolts reintroduce vibration immediately after replacement. Use a torque wrench and follow the spec in your vehicle's service manual.
Ignoring the crank arm. A slightly bent crank arm is hard to spot but causes noticeable vibration. Check it with a straightedge while the assembly is apart.
Using the wrong grease on reassembly. Standard lithium grease works for most wiper linkage pivot points, but avoid petroleum-based lubricants on rubber bushings they degrade rubber over time.

How much should I expect to spend on replacement parts?

For most vehicles, a full refresh of the wiper motor assembly new bushings, remanufactured motor, grommets, and hardware runs between $60 and $200 in parts. Labor at a shop adds another $75–$150 depending on how much of the cowl and trim need to come off.

If only the bushings need replacing, you're looking at under $20 in parts and about 30–60 minutes of your time. That's why testing and diagnosing before buying matters.

Can I do this repair myself?

Yes, in most vehicles. Replacing wiper linkage bushings and the motor assembly is a moderate DIY job. You'll typically need to remove the wiper arms, pull off the cowl panel (held by clips or screws), unplug the motor connector, and unbolt the assembly. The job takes one to two hours for a first-timer.

Label your wiper arm positions before removal so they park correctly when you reinstall. Take photos as you disassemble. And unplug the battery before disconnecting the motor to avoid any electrical surprises.

What's the practical next step?

Run a diagnosis before you order anything. Start by checking linkage bushings for visible play, then bench-test the motor if the bushings look fine. Here's a quick checklist:

Turn wipers on while parked and watch the assembly for wobble at different speeds.
Grab the wiper linkage near each pivot point and check for excessive play.
If bushings are cracked or loose, order a full bushing kit for your vehicle.
If the motor runs rough on a bench test or makes grinding noises, order a remanufactured motor with a warranty.
Replace the mounting grommets while you have the assembly out they cost a few dollars and prevent future issues.
Torque all fasteners to spec and use the correct lubricant on pivot points.
Test the wipers at all speeds after reassembly before reinstalling the cowl and arms.

Getting the right replacement parts the first time saves you from pulling the cowl apart twice. Diagnose, then buy, then fix. That's the order that works.

Get Started