A Lexus Owner's Guide to the 2013-2019 ES300h Automatic Transmission Mount
Learn to spot the signs of a failing transmission mount and choose the right replacement for your luxury hybrid.
- A clunking noise when shifting gears is the most common symptom of a failed transmission mount.
- For the ES300h, using a genuine OEM or premium hydraulic mount is strongly recommended to preserve the smooth, quiet ride and avoid increased vibration from budget aftermarket parts.
- While you can drive with a bad mount, it's best to replace it soon to prevent stress and damage to other drivetrain components.
- Expect a total replacement cost of $650-$870 at a repair shop using an OEM part.
Is Your Lexus ES300h Feeling Less Smooth? It Could Be a Transmission Mount.
A failing automatic transmission mount can introduce noise and vibration that ruins the driving experience of your Lexus. Because this part is made of rubber, it can crack, sag, and wear out over time from constant use and exposure to the elements. When it fails, the transmission is no longer held securely, leading to a number of noticeable symptoms.
Symptoms of a Bad Transmission Mount
- Clunking or Thumping Noises: The most common sign is a distinct "clunk" when you shift from Park into Drive or Reverse. You might also hear this noise during hard acceleration or braking as the transmission moves around.
- Excessive Vibration: You may feel a new, persistent vibration in the floor, seats, or steering wheel, especially when the car is stopped and in gear. This happens because the worn-out mount can no longer absorb the transmission's vibrations.
- Drivetrain Lurching: A feeling that the engine and transmission are jerking or lurching forward or backward when you accelerate or brake. In some cases, you might even see the engine move excessively if an assistant revs the engine while you watch from under the hood.
A Note on Aftermarket Parts for Your Lexus
For a luxury vehicle like the ES300h, the choice between Original Equipment Manufacturer (OEM) and aftermarket parts is critical, especially for mounts. The original Lexus mount is typically a hydraulic, fluid-filled component designed to absorb a wide range of vibrations and deliver a smooth ride.
Many budget-friendly aftermarket brands, such as Anchor or DEA, use a solid, harder rubber compound. While functional, this design is less effective at damping vibrations and often results in a noticeable increase in cabin noise and vibration (NVH). Many Lexus owners who have tried budget aftermarket mounts report being unhappy with the ride quality and sometimes experience premature failure. For this part, sticking with an OEM or a premium aftermarket equivalent that specifies a hydraulic design is highly recommended to maintain your car's original comfort levels.
Cost of Replacing the Automatic Transmission Mount
The total cost can vary based on your location and whether you choose an OEM or aftermarket part. Here’s a general breakdown for the 2013-2019 Lexus ES300h:
| Part/Service | Estimated Cost | Notes |
|---|---|---|
| New Aftermarket Part | $74 - $95 | Price for brands like Anchor or DEA. May increase cabin vibration. |
| New OEM Part | $200 - $220 | Recommended for maintaining factory ride quality. |
| Shop Labor | $440 - $650 | Labor at a professional repair shop can be significant. The job typically takes 2-3 hours. |
| Total Professional Replacement (OEM Part) | $650 - $870 | This is the estimated all-in cost for parts and labor at a dealership or independent shop. |
Known Issues, Recalls, and Service Bulletins
As of early 2026, there are no specific recalls or Technical Service Bulletins (TSBs) from Lexus or the NHTSA that directly address the automatic transmission mount for the 2013-2019 ES300h. Any failure of this part is typically due to age and wear. Always check for the latest information using your vehicle's VIN on the NHTSA website.
Frequently Asked Questions (FAQ)
Can I drive my ES300h with a bad transmission mount?
Yes, but it is not recommended for long. While the transmission is unlikely to fall out, driving with a bad mount puts extra stress on other components like engine mounts, CV axles, and exhaust connections, potentially leading to more expensive repairs down the road. It's best to get it replaced as soon as you notice symptoms.
Will a new aftermarket mount really make my Lexus vibrate more?
Yes, it is very likely if you choose a budget, solid-rubber mount. The original Lexus mounts are fluid-filled (hydraulic) for a reason—to provide superior damping. A solid rubber mount is stiffer and transmits more of the drivetrain's natural vibrations into the car's frame, which you will feel in the cabin. For a Lexus, this can be a significant downgrade in ride quality.
Is replacing the transmission mount a DIY job?
For an experienced DIY mechanic, it is possible. The job requires safely lifting and supporting the vehicle, using a jack to support the transmission, and having the right tools to access the mount bolts, which are often located in a tight space near the driver-side wheel well. However, given the labor involved, many owners choose to have a professional handle the replacement.
How do I know it's the transmission mount and not an engine mount?
The symptoms are very similar and they often wear out around the same time. A clunking noise specifically when shifting into gear often points more directly to the transmission mount. A mechanic can perform a visual inspection and use a pry bar to check for excessive movement in all the mounts to pinpoint the failed part. It's common to replace engine and transmission mounts together as a set.
Technical Specifications
OEM Part Numbers: 12371-36070 12372-36070 12371-31291
The left (driver side) transmission mount is the most commonly replaced. The OEM part is a hydraulic, fluid-filled design for superior vibration damping. Aftermarket options are typically solid rubber. Always verify the correct part number with your vehicle's VIN before ordering.
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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.
- Lexus ES300h:
- 🛍️ Shop This Part
- Is Your Lexus ES300h Feeling Less Smooth? It Could Be a Transmission Mount.
- Symptoms of a Bad Transmission Mount
- A Note on Aftermarket Parts for Your Lexus
- Cost of Replacing the Automatic Transmission Mount
- Known Issues, Recalls, and Service Bulletins
- Frequently Asked Questions (FAQ)
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