2021-2025 Tesla Model S & Model X Drive Axle: Diagnosing Shudder, Clicks, and Vibrations
This guide covers the common failure symptoms, replacement costs, and critical compatibility differences for the drive axle shafts on 'Palladium' generation Tesla Model S and Model X vehicles.
- The most common failure symptom is a shudder or vibration from the front end during hard acceleration, a well-known issue often called the 'Tesla Shudder'.
- Part compatibility is critical. Axles are specific to front/rear and left/right positions. This guide is for 2021+ 'Palladium' refresh models ONLY. Always verify your original part number.
- When buying a used axle, the condition of the rubber CV boots is the most important factor. Any tear or crack means the joint is compromised and will fail.
- Replacement requires a new, one-time-use axle nut torqued to 245 Nm (181 lb-ft).
Symptoms of a Failing Drive Axle
Because the Tesla Model S and Model X are so quiet, drivetrain noises are often more noticeable than in a gasoline-powered car. Axle failures typically present with very specific sounds and vibrations.
The #1 Symptom: Shudder or Vibration During Acceleration
The most widely reported symptom for these models is a noticeable shudder, shake, or vibration, usually from the front of the vehicle, during moderate to hard acceleration. This issue is so common it's often called the "Tesla Shudder." The vibration is caused by premature wear within the inner CV joints, which can develop imperfections from the high torque and the steep angle of the axles, especially when the air suspension is set to a higher ride height. While Tesla Technical Service Bulletin (TSB) SB-21-39-001 officially addresses this on pre-2021 models, the same mechanical issue persists on the 2021-2025 Model S and Model X.
🎬 Watch: Understanding the Tesla acceleration shudder and tire wear solutionClicking or Popping Noises When Turning
A rhythmic clicking or popping sound that occurs when making sharp, low-speed turns (like in a parking lot) is a classic sign of a worn outer CV joint. The noise is caused by excessive play in the worn joint, allowing the internal ball bearings to click as they move in their channels. The sound will typically come from the side of the vehicle with the bad axle and may disappear when driving straight.
🎬 See: How to fix a clicking Tesla Model X axleClunking or Knocking Sounds
A clunking or knocking sound when you accelerate, decelerate, or shift between Drive and Reverse can point to a failing inner CV joint. This indicates significant wear and excessive movement within the joint assembly.
Grease on the Inside of the Wheel
The CV joints are packed with a special grease and sealed by flexible rubber boots. If a boot tears or cracks, this grease will be flung outward by the spinning axle, splattering on the inside of the wheel, tire, and nearby suspension components. A torn boot allows dirt and moisture to enter the joint, which contaminates the remaining grease and rapidly destroys the joint. A visual inspection for leaking grease is one of the easiest ways to spot a compromised axle.
Buying a Used Drive Axle Shaft (2021-2025 S & X)
For high-performance vehicles like the Model S and Model X, a high-quality used OEM axle is often a better choice than a new, unproven aftermarket part. The OEM axles are designed to handle the specific torque characteristics of Tesla's drive units. Here’s what to look for.
1. Inspect the CV Boots Above All Else
This is the most important inspection. A used axle is only as good as its CV boots. Carefully inspect the rubber boots on both ends of the axle. They should be supple, with no cracks, splits, or pinholes. Squeeze the boots to check for hidden cracks and ensure they are properly sealed with their clamps. If you see any sign of grease leakage or a torn boot, do not buy the part. The joint is already contaminated and will fail prematurely.
2. Verify the Exact Part Number
Warning: Axles are not interchangeable. They are specific to their position on the vehicle. You must match the part number from your original axle to ensure compatibility.
The drive axles are different for the front, rear, left, and right sides. For example:
- Part number 1420119-00-B is for the Front Right axle on 2021+ Model S and Model X vehicles.
- Part number 1420161-00-A has been identified as a Rear Left axle for these models.
These parts are only for the 2021-2025 "Palladium" refresh models and will not fit earlier vehicles. They are for All-Wheel Drive (AWD) models, which includes all Long Range and Plaid trims from this era.
3. Check for Physical Damage
Check the splines on both ends of the axle for any damage, twisting, or excessive wear. Ensure the threaded end for the axle nut is clean and undamaged. Try to move the joints by hand; they should move smoothly but not have excessive looseness or play.
Is Mileage a Concern?
Not necessarily. Due to the high-stress nature of these components, especially on Plaid models, failure can occur at relatively low mileage (some owners report issues under 30,000 miles). A high-mileage axle from a car that was driven gently may be in better condition than a low-mileage axle from a car that was frequently launched hard. The physical condition of the boots is a more reliable indicator of health than the odometer reading.
Replacement Overview & Special Procedures
Replacing a drive axle is a moderately difficult job that is feasible for an experienced DIY mechanic. However, it requires proper tools and adherence to safety procedures.
Safety First: Before lifting the vehicle, you must use the touchscreen to activate 'Jack Mode' to disable the self-leveling air suspension. Failure to do so can cause the vehicle to unexpectedly lower, creating a serious safety hazard. Always use jack stands and follow proper safety protocols when working under a vehicle.
The general steps for replacement include:
- Engage 'Jack Mode' and safely lift and support the vehicle.
- Remove the wheel and the large central axle nut. This nut is single-use and must be replaced.
- Disconnect necessary suspension components to allow the steering knuckle to move, such as the upper control arm, stabilizer bar link, and tie rod end.
- Use a puller to push the axle splines out of the wheel hub.
- Use a slide hammer with a special cable attachment or a pry bar in the correct location to pop the inner end of the axle out of the drive unit. 🎬 Watch: DIY cable trick to easily remove a Tesla CV axle
- When installing the new axle, apply a small amount of Molykote M-77 grease to the outer splines and carefully slide the inner joint into the drive unit until it clicks into place.
- Reassemble the suspension, install a new axle nut, and torque all fasteners to specification.
Key Torque Specs
Using a torque wrench is mandatory for this job. Over or under-tightening these critical bolts can lead to component failure or unsafe driving conditions. While specs can vary slightly, these are the commonly cited values from Tesla's service documentation:
| Component | Torque Spec (Nm) | Torque Spec (lb-ft) | Notes |
|---|---|---|---|
| Axle Nut (Front & Rear) | 245 Nm | ~181 lb-ft | Must use a new nut. |
| Wheel Lug Nuts | 175 Nm | ~129 lb-ft | |
| Rear Upper Control Arm to Knuckle | 150 Nm | ~111 lb-ft | |
| Front Upper Control Arm to Knuckle | 60 Nm | ~44 lb-ft | |
| Brake Caliper to Knuckle (Rear) | 125 Nm | ~92 lb-ft |
Cost to Replace a Tesla Model S / X Drive Axle
Costs can vary based on your location and whether you choose OEM or aftermarket parts. Given the performance demands, using a recycled OEM part is a strong value.
| Part / Service | Estimated Cost | Notes |
|---|---|---|
| New OEM (from Tesla) | $700 - $900 | Price for a single axle assembly. |
| New Aftermarket | $150 - $400 | Availability for 2021+ models is limited and quality may not match OEM for high-torque applications. |
| Used OEM | $250 - $450 | A cost-effective option that retains factory quality. Price for a single inspected axle. |
| Shop Labor | $350 - $600 | Represents 2-3 hours of labor at an independent shop. Tesla may offer a lower subsidized price if your car qualifies for the shudder TSB. |
Frequently Asked Questions
Is the acceleration shudder dangerous?
According to Tesla, the vibration is a Noise, Vibration, and Harshness (NVH) issue and does not affect steering, braking, or safety. However, if a worn axle is ignored, it can eventually break completely, which would cause a loss of power to that wheel and leave the vehicle stranded. It is best to address the issue as soon as it appears.
Will this part fit my 2020 Model S?
No. This part is specifically for the refreshed Tesla Model S and Model X that were introduced in 2021 (often called the 'Palladium' update). The drivetrain and suspension components are different from the 2020 and earlier models.
Is this the same as a driveshaft?
No. A drive axle, or half-shaft, transmits power from the differential/drive unit to a wheel. A driveshaft typically refers to the single, longer shaft that connects a transmission to a differential in a rear-wheel-drive or all-wheel-drive vehicle. Your Tesla has four drive axles (one for each wheel) but does not have a traditional central driveshaft.
Can I just replace the torn rubber boot?
While CV boot kits are available for many cars, it is generally not recommended. Once a boot has torn, the joint has been contaminated with dirt and debris, and the damage has already begun. Furthermore, the labor involved in replacing just the boot is nearly the same as replacing the entire axle assembly. For this reason, replacing the complete drive axle shaft is the standard and most reliable repair.
Helpful Videos
Technical Specifications
OEM Part Numbers: 1420119-00-B (Front Right) 1420161-00-A (Rear Left)
Axle Nut Torque: 245 Nm (181 lb-ft)
We Have This Part in Stock
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.
- Tesla S:
- TESLA S:
- Tesla X:
- TESLA X:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing Drive Axle
- Clicking or Popping Noises When Turning
- Clunking or Knocking Sounds
- Grease on the Inside of the Wheel
- Buying a Used Drive Axle Shaft (2021-2025 S & X)
- 1. Inspect the CV Boots Above All Else
- 2. Verify the Exact Part Number
- 3. Check for Physical Damage
- Is Mileage a Concern?
- Replacement Overview & Special Procedures
- Key Torque Specs
- Cost to Replace a Tesla Model S / X Drive Axle
- Frequently Asked Questions
- 🎟️ Get 5% Off