Motor mounts hold your engine in place and absorb vibration as it runs
A motor mount is a rubber-and-metal component that connects your engine to the frame of your vehicle. As your engine runs and produces power, it creates vibration and movement. The motor mounts keep that movement controlled so the engine does not shift excessively or damage surrounding parts. Over time, the rubber deteriorates from heat, oil exposure, and constant flexing, and the mount fails.
When a motor mount wears out, you will notice the engine shaking noticeably when you accelerate, brake, or shift gears. The vibration travels through the steering wheel and floor. In some cases, you may hear clunking sounds from under the hood, or feel the engine rock side to side when you put the car in gear. A failed mount can also allow the engine to move enough to damage hoses, belts, or the radiator fan.
Most vehicles have between three and four motor mounts, depending on engine size and vehicle design. A single mount can fail while others remain intact, but once one fails, the remaining mounts carry extra load and often fail sooner than they would have otherwise. Replacing one mount usually means the mechanic will inspect the others and recommend replacing all of them at the same time.
Key Takeaways
- Motor mount replacement typically costs between $300 and $1,200 per mount, depending on which mount, your vehicle model, and whether the job requires removing other engine components to reach it.
- Labor time ranges from one to four hours per mount; some mounts are accessible from the top of the engine, while others require removing the engine partially or completely.
- A single failed mount creates extra stress on the remaining mounts, so mechanics often recommend replacing all mounts together even if only one is visibly damaged.
- Symptoms include noticeable engine vibration during acceleration or braking, clunking sounds from the engine bay, and visible engine rocking when you shift into gear.
What motor mount replacement costs
The total cost depends on three factors: which mount has failed, how difficult it is to access, and whether you replace one or all of them. A single replacement typically runs $300 to $1,200, with labor making up $150 to $600 of that and the part itself $150 to $600. Luxury vehicles, high-performance engines, and vehicles where the mount sits deep in the engine bay cost more because labor time is longer.
If you replace all mounts at once—which many mechanics recommend—the total can reach $1,500 to $3,500 depending on the vehicle. Some shops offer a discount when doing multiple mounts in one visit because they do not have to remove and reinstall the engine multiple times. Independent repair shops typically charge less than dealerships for the same work, though some dealerships offer warranty coverage on parts and labor that independents do not.
The part itself is usually inexpensive—often $50 to $150 per mount—but the labor is high because accessing the mount often requires removing other engine components. Some mounts sit directly under the engine and require lifting the engine or removing the subframe. Others sit on the side and need the wheel well opened or the engine tilted. A few are accessible from the top with basic tools.
How mechanics access and replace a motor mount
The process begins with the vehicle on a lift and the engine secured so it cannot fall. The mechanic removes any components blocking access to the mount—this might include the wheel, fender liner, air intake, or radiator hose. Once the mount is visible, they support the engine weight with a jack or engine hoist so the mount can be unbolted without the engine dropping.
The old mount is unbolted from both the engine and the frame, then removed. The new mount is positioned and bolted in place, usually hand-tight first, then torqued to the manufacturer's specification with a torque wrench. Torque matters because an undertightened bolt can loosen and cause the engine to shift; an overtightened bolt can crack the rubber or strip the threads.
Once the new mount is installed, the engine is lowered back onto it, and the supporting jack is removed. All removed components are reinstalled and checked for proper fit. The mechanic then starts the engine and checks that vibration has decreased and the engine sits level in the bay. Some shops test-drive the vehicle to confirm the fix before returning it to you.
Labor time varies widely depending on mount location
The easiest mounts to replace take one to two hours. These are usually side mounts or rear mounts that sit on the outside of the engine and do not require removing the engine or major components. A mechanic can access them, support the engine, unbolt the old mount, and install the new one without extensive disassembly.
Mounts that sit directly under the engine or between the engine and transmission take two to four hours. The mechanic must lift the engine higher, remove more components, or partially lower the engine to reach the mount. Some vehicles require removing the engine oil pan or transmission pan to access the mount bolts from underneath.
In rare cases—usually on front-wheel-drive vehicles with tight engine bays—the entire engine must be removed to replace a single mount. This can take six to eight hours of labor and significantly increases the total cost. Before you approve a job, ask the mechanic which mounts need replacement and how long each one will take. If one mount requires engine removal and others do not, you may choose to replace only the failed one now and the others later.
Signs that a motor mount has failed
The most obvious sign is excessive engine vibration felt through the steering wheel, floor, or seat when the engine is running. This vibration is usually worse during acceleration or when the engine is under load. You may notice it most when pulling away from a stop or climbing a hill.
A clunking or banging sound from the engine bay during acceleration or gear shifts indicates the engine is moving too much and hitting the frame or other components. This sound is often louder when shifting from Park to Drive or Reverse, because the sudden engine torque causes it to rock forward or backward.
Visible engine movement is another sign. With the engine running and the car in Park, look at the engine from the side or front. If it rocks noticeably when you shift into Drive or Reverse, a mount is likely worn. You can also have a helper watch the engine while you gently accelerate and brake; excessive rocking suggests a failed mount.
Damage to hoses, belts, or the radiator fan can result from a failed mount allowing the engine to shift into components it normally clears. If you notice a coolant leak, a broken radiator fan, or a belt that has been rubbed or torn, have the motor mounts inspected before assuming the damaged component is the only problem.
Replacing one mount versus replacing all mounts
If only one mount has failed and the others are visibly intact, you can replace just that one. This saves money in the short term and gets you back on the road faster. However, the remaining mounts are now carrying extra load, and the failed mount usually indicates the others are aging and will fail soon.
Many mechanics recommend replacing all mounts together because the labor cost is only slightly higher than replacing one—you do not have to remove and reinstall the engine multiple times. If you replace only the failed mount now and another fails six months later, you will pay for engine removal and reinstallation twice. Replacing all at once costs more upfront but often saves money over the life of the vehicle.
Ask your mechanic to inspect all mounts and report their condition. Some shops provide photos or video showing cracks, oil saturation, or separation of the rubber from the metal. If the others show visible damage, replacing them together makes financial sense. If they appear intact, replacing only the failed one is a reasonable choice, though you should plan to replace the others within the next year or two.
What to expect after motor mount replacement
After the work is done, the engine vibration should be noticeably reduced or gone. The steering wheel and floor should feel steady during acceleration and braking. If vibration remains, the mechanic should recheck the work—sometimes a bolt was not torqued correctly, or another mount was damaged and needs replacement too.
Some vehicles have engine mounts that are designed to allow a small amount of movement for comfort, so you may still feel a slight vibration at idle or during hard acceleration. This is normal. What should be gone is the excessive shaking that made you seek repair in the first place.
Most shops offer a warranty on the parts and labor, typically 12 months or 12,000 miles. If a newly installed mount fails within that period, the shop will replace it at no charge. Keep your receipt and note the warranty terms so you know what is covered if a problem develops.
Frequently Asked Questions
Can I drive with a failed motor mount?
You can drive short distances, but it is not safe for long trips. The excessive engine movement can damage hoses, belts, and the radiator fan, leading to overheating or a broken belt that leaves you stranded. The vibration also makes steering and braking less precise. Have it repaired as soon as you can.
Why do motor mounts fail faster on some vehicles than others?
High-performance engines produce more vibration and torque, so their mounts wear faster. Vehicles driven in stop-and-go traffic or with aggressive acceleration patterns also see faster wear. Heat from the engine bay and exposure to oil and coolant leaks also degrade the rubber faster on some vehicles than others.
Is motor mount replacement covered by a vehicle warranty?
Most factory warranties cover motor mounts for three years or 36,000 miles. Extended warranties may cover them longer. Check your warranty paperwork or contact your dealership to confirm coverage. If your vehicle is still under warranty, have the work done at the dealership so the warranty remains valid.
What is the difference between an OEM mount and an aftermarket mount?
OEM (original equipment manufacturer) mounts are made by the vehicle manufacturer and are usually more expensive but designed specifically for your vehicle. Aftermarket mounts are made by third-party suppliers and cost less but vary in quality. Most mechanics recommend OEM mounts for reliability, though quality aftermarket mounts are often acceptable.
Can a bad motor mount damage the transmission?
Excessive engine movement can stress transmission mounts and shift linkages, but it does not usually damage the transmission itself. However, if the engine rocks far enough to damage the transmission pan or cooling lines, that can lead to transmission problems. This is why it is important to repair a failed mount before other damage occurs.