What Engine Mounts Do and What the Job Includes
Your engine and transmission weigh several hundred pounds and twist every time you step on the gas. The mounts hold that weight in place and keep the shaking out of the cabin. Most are a rubber block bonded between two metal brackets. Some are filled with fluid to absorb more. Some luxury cars use mounts that change stiffness on command.
The transmission mount is part of the same system and is often sold as one of the engine mounts.
The job is simple in concept. The tech supports the engine with a jack or a support bar across the engine bay, removes the bolts on the bad mount, lifts the engine a little, swaps the mount, and tightens the bolts with the engine sitting at rest. On easy cars this is about an hour per mount. On hard ones it can be three or more.
The tech should also check the bolts and brackets. Some brackets crack, and some bolts stretch. Reusing a damaged bracket with a new mount is a common reason the clunk comes back.
On cars with active mounts, the shop may need to plug in the wiring or vacuum line and check for codes after the job.
Why the Price Varies
Location is the biggest factor. A top mount you can see from above is quick. A lower mount under the exhaust, or one that needs the subframe lowered, is slow.
Mount type matters next. A plain rubber mount for a compact can be under $60. A fluid filled mount for a midsize V6 can be $100 to $200. An active mount for a luxury car can top $300.
Mount quality matters a lot in this category. Cheap aftermarket mounts are a common reason for a vibration that comes back soon after the repair. OEM or a known brand is worth the extra money.
Venue matters too. Dealers charge the most. Independent shops are usually the best value. A mobile mechanic can do most top and side mounts in a driveway. Lower mounts on some cars need a lift.
Your local labor rate matters too. Three hours at $95 and three hours at $160 differ by nearly $200 on the same mount. Ask whether the quote covers one mount or several, since many shops quote a set.
Should You Replace All the Mounts?
Not automatically. Mounts wear at different rates, and the one that takes the most torque usually goes first.
The honest answer depends on age. On a car with 150,000 miles, if one mount is torn, the others are likely tired. Replacing them all at once saves on repeat labor and gives the best result.
On a newer car where one mount failed early, just replace that one. Have the tech show you the others.
Ask the tech to do a power brake test. With your foot on the brake, they shift into drive and reverse and lightly press the gas while someone watches the engine. A healthy engine moves a little. A bad mount lets it jump.
Think about labor overlap too. If two mounts are reached through the same steps, doing both now costs less than two separate visits. If each mount is on a different side with its own steps, there is less to save by doing them together.
A sagging engine changes how the other mounts sit. When one mount collapses, the others take extra load and twist. That is another reason worn mounts tend to fail one after another on older cars.
What Else Feels Like a Bad Mount
Engine shake can come from many places. Rule these out before you pay for mounts.
A misfire from a bad spark plug or coil makes the engine run rough at idle. That shake feels just like a bad mount but needs a different fix.
A clunk when you shift or take off can be a CV axle, a U joint, or a worn control arm bushing.
A vibration at highway speed is usually tires, wheel balance or an axle, not mounts. Mount vibration is worst at idle in gear and when you load the engine.
A bad idle speed or a vacuum leak can also make the engine shake at stops.
A good shop scans for misfires and does the power brake test before quoting mounts.
On hybrids, a thump at engine start is often a mount, but it can also be the engine start settings. A scan and a look at the mounts sorts that out.
What Often Gets Done at the Same Time
A few items are worth a look while the engine is supported.
- Other mounts at high mileage: worth doing if they show cracks or sag.
- Transmission mount: often worn at the same time as the engine mounts.
- Exhaust hangers and the flex pipe: a bouncing engine can crack them.
- Serpentine belt and hoses: worth a check if the engine has been moving a lot.
- Upgraded stiff mounts: an upsell on a daily driver. They add vibration in the cabin.
Questions to Ask Before You Approve the Quote
These questions help you pay for the right mount and the right fix.
- Which mount is bad, and can you show me the crack, sag or leak?
- Did you rule out a misfire or an axle problem?
- Is the price for one mount or all of them?
- Are you using OEM or an aftermarket brand, and which one?
- Is my mount fluid filled or active, and does it need a relearn?
- What is the warranty on the part and the labor?
How Long Mounts Last
Many mounts last 100,000 miles or more. Heat, oil leaks and hard driving shorten that. Oil dripping onto a rubber mount softens it and makes it fail early, so fix oil leaks above the mounts.
Hard launches and towing twist the mounts harder. Smooth driving helps them last.
A quality part matters most. Mounts are one place where the cheapest option often costs more in the end.
Signs you need this repair
- More vibration in the seat, steering wheel or pedals at idle, especially in drive
- A clunk or bang when you shift into drive or reverse
- The engine lurches or rocks when you step on or off the gas
- A thump each time a hybrid engine starts
- Visible cracks, sagging or torn rubber on a mount
- Dark fluid leaking from a fluid filled mount
- Engine sits lower on one side or the fan hits the shroud
Cost by vehicle type
| Vehicle | Typical range | Notes |
|---|---|---|
| Compact / economy car | $175 to $760 | Front drive cars often wear out the passenger side or the rear torque mount first. Most are easy to reach and parts are cheap. |
| Midsize sedan / small SUV | $185 to $810 | Many V6 sedans use fluid filled or active mounts that cost more. The rear mount may need the car on a lift. |
| Full-size truck / large SUV | $215 to $940 | Trucks usually have two engine mounts and one transmission mount. The engine has to be lifted a bit to swap them, which a shop does with a jack or hoist. |
| Luxury / European | $260 to $1,150 | Many use fluid filled or electronic active mounts that can cost $200 to $400 each. Some need the subframe lowered. |
| Hybrid | $200 to $890 | Hybrids start and stop the engine often, which works the mounts hard. Worn mounts show up as a thump each time the engine restarts. |
| Electric vehicle | $210 to $930 | Motor mounts rarely fail but can wear from instant torque. A clunk when you take off is the usual sign. |
| Diesel / heavy duty | $255 to $1,115 | Diesels shake more and use heavy mounts. Expect the upper part of the range and the engine lifted to do the job. |
Ranges assume national-average labor rates ($95, $140/hr) and quality aftermarket parts.
Cost by state
State ranges reflect typical independent-shop labor rates for a midsize vehicle.
Common questions
How much does it cost to replace an engine mount?
Most single mounts cost about $200 to $650 at an independent shop. Fluid filled or active mounts and hard to reach mounts cost more. Replacing all mounts can run $600 to $1,500.
Can I drive with a bad engine mount?
Usually yes for a short time, but it gets worse. A failing mount stresses hoses, wiring, axles and the exhaust. A fully broken mount should be fixed soon.
How do I know if my engine mount is bad?
The usual signs are more vibration at idle in gear and a clunk when you shift. A shop can confirm it with a power brake test while watching the engine move.
Should I replace all engine mounts at once?
Only if they are all worn. On a high mileage car it often makes sense. On a newer car, replace the bad one and check the rest.
Can a bad engine mount cause a check engine light?
Not directly in most cars. A shaking engine can sometimes upset sensors or wiring. Active mounts on some luxury cars can set their own warning.
Can a mobile mechanic replace engine mounts?
Yes, for most top and side mounts. Lower or rear mounts on some cars need a lift and are better done in a shop.
Why does my car still vibrate after new engine mounts?
Either the mounts were not the real cause, or the new parts are poor quality. Check for misfires and use OEM or a known brand mount.
How much does an engine mount replacement cost at a dealer?
Dealers often charge $350 to $900 per mount, more for active mounts. The gap is mostly labor rate and OEM part price. An independent shop using an OEM or known brand mount is usually cheaper.
Related Repair Guides
More Engine Repair Costs
Sources and further reading
Primary sources behind this page. Federal safety, emissions and consumer-protection references, worth reading before you authorize any repair.
- fueleconomy.gov maintenance guide Federal guidance on routine maintenance and engine health.
- ASE certification Look for ASE certified techs when choosing who works on your engine.
- fueleconomy.gov hybrid technology How hybrids stop and restart the engine, which works the mounts harder.
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