why does my Tesla Model S Original (2012-2020) rear end feel loose

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

499 words

Problem Statement

Learn how to diagnose and fix a loose rear end in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Suspension

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems or components to avoid shocks and shorts.

Symptoms

•Noticeable instability or swaying in the rear end during cornering
•Uneven tire wear on the rear tires
•Clunking or rattling noises from the rear suspension
•Difficulty maintaining straight-line stability
•Rear end feels bouncy or overly soft when driving over bumps

Diagnostic Steps

1
Inspect rear suspension components visually for signs of wear or damage, including bushings, control arms, and shocks/struts.
2
Check tire pressure on the rear tires to ensure they are within the manufacturer's specifications.
3
Examine the alignment of the rear wheels using a wheel alignment tool to identify any misalignments.
4
Test the rear shocks/struts for proper damping by pushing down on the rear of the vehicle and observing the rebound.
5
Look for any loose or damaged components in the rear subframe that could contribute to instability.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

Verification

After completing the repair, verify that the issue has been resolved:

✓Test the affected component to ensure it functions correctly
✓Check for any error codes or warning lights
✓Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

•Follow the manufacturer's recommended maintenance schedule
•Address warning signs early before they develop into major issues
•Use quality parts and fluids recommended for your vehicle
•Keep detailed records of all repairs and maintenance

Tools & Equipment Required

•OBD-II scanner
•Socket set
•Bushing removal tool
•Hydraulic press
•Wheel alignment tool

Parts Required

•Control arm bushings
•Shocks/struts (if damaged)

Related Faults

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Diagnostic Steps

1
Inspect rear suspension components visually for signs of wear or damage, including bushings, control arms, and shocks/struts.
2
Check tire pressure on the rear tires to ensure they are within the manufacturer's specifications.
3
Examine the alignment of the rear wheels using a wheel alignment tool to identify any misalignments.
4
Test the rear shocks/struts for proper damping by pushing down on the rear of the vehicle and observing the rebound.
5
Look for any loose or damaged components in the rear subframe that could contribute to instability.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface and secure it with wheel chocks.
Gather necessary tools and parts.
Safety warning: Disconnect the 12V battery to prevent electrical issues during repairs.

2. Inspect and Replace Worn Suspension Components

Inspect Components:
- Remove the rear wheels using a socket set.
- Inspect control arm bushings for cracks or excessive play.
- Check the condition of the shocks/struts for leaks or damage.
Replace Components (if necessary):
- For worn bushings:
  1. Use a bushing removal tool to extract old bushings from the control arms.
  2. Press in new bushings using a hydraulic press.
- For defective shocks/struts:
  1. Remove the mounting bolts using a socket set.
  2. Replace with new shocks/struts, ensuring to torque bolts to manufacturer's specifications (usually around 50-70 ft-lbs).

3. Wheel Alignment

After replacing any components, perform a rear wheel alignment:
1. Use a wheel alignment machine to adjust camber, caster, and toe settings to the manufacturer's specifications.
2. Take the vehicle off the alignment rack and recheck.