why is my Tesla Model S Plaid/Refresh (2021-present) engine making a knocking noise

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

3 min read

477 words

Problem Statement

Learn how to diagnose and fix engine knocking noise in Tesla Model S Plaid. Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Engine

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical systems.
•Ensure the vehicle is on a flat surface and stable when lifting.

Symptoms

•Knocking noise during acceleration or deceleration
•Possible reduction in acceleration performance
•Unusual vibrations felt through the chassis
•Occasional warning messages on the dashboard
•Increased energy consumption (reduced efficiency)

Diagnostic Steps

1
Inspect the vehicle for any visible signs of fluid leaks or damaged components.
2
Use an OBD-II scanner to check for any stored error codes.
3
Perform a visual inspection of the motor mounts for wear or damage.
4
Check the condition of the battery cooling system, ensuring proper operation.
5
Conduct a sound test by revving the engine in a safe environment to isolate the source of the noise.
6
Inspect the undercarriage for any loose parts or debris that may be contributing to the noise.

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
•Torque wrench
•Inspection mirror

Parts Required

•Motor mounts (if damaged)
•Any necessary fasteners or seals

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Diagnostic Steps

1
Inspect the vehicle for any visible signs of fluid leaks or damaged components.
2
Use an OBD-II scanner to check for any stored error codes.
3
Perform a visual inspection of the motor mounts for wear or damage.
4
Check the condition of the battery cooling system, ensuring proper operation.
5
Conduct a sound test by revving the engine in a safe environment to isolate the source of the noise.
6
Inspect the undercarriage for any loose parts or debris that may be contributing to the noise.

Solution

1. Preparation

Tools Required:
- OBD-II scanner
- Socket set
- Torque wrench
- Inspection mirror
Ensure the vehicle is parked on a level surface, engage the parking brake, and disconnect the 12V battery to prevent electrical hazards.

2. Inspect and Tighten Components

Sub-steps:
- Remove the front underbody shield using a socket set.
- Inspect all visible bolts and fasteners on the motor mounts and surrounding components.
- Tighten any loose bolts to manufacturer's specifications (refer to service manual for torque values).
- Recheck the tightness of the battery cooling unit connections.

3. Replace Damaged Components

Sub-steps:
- If motor mounts are worn, remove the old mounts using a socket set.
- Install new motor mounts, ensuring they are torqued to the specifications in the service manual.
- Reattach any components removed during inspection.

4. Reassemble and Test

Sub-steps:
- Reinstall the underbody shield securely.
- Reconnect the 12V battery.
- Start the vehicle and allow it to idle, listening for any knocking noise.
- Take the car for a test drive to confirm the issue has been resolved.