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

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

514 words

⚠️ Safety Warning

This issue requires immediate attention. If you are not experienced with automotive repairs, consult a professional mechanic. Working on critical systems can be dangerous.

Problem Statement

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

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the vehicle to cool before inspecting engine components.

Symptoms

•Knocking noise from the engine compartment when starting
•Possible vibrations felt through the chassis
•Intermittent loss of power during initial acceleration
•Warning messages on the dashboard
•Check engine light illuminated

Diagnostic Steps

1
Scan the vehicle’s computer system using an OBD-II scanner to retrieve any error codes.
2
Inspect the battery terminals and connections for corrosion or loose fittings.
3
Check the powertrain for any visible signs of damage or loose components.
4
Listen for any unusual sounds from the electric motors during startup.
5
Verify the condition of the motor mounts and transmission mounts.
6
Conduct a visual inspection of the drive axles and joints for any signs of wear or obstruction.

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
•Multimeter
•Socket set
•Torque wrench
•Inspection mirror

Parts Required

•Battery terminal connectors (if corroded)
•Motor mounts (if found damaged)

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Diagnostic Steps

1
Scan the vehicle’s computer system using an OBD-II scanner to retrieve any error codes.
2
Inspect the battery terminals and connections for corrosion or loose fittings.
3
Check the powertrain for any visible signs of damage or loose components.
4
Listen for any unusual sounds from the electric motors during startup.
5
Verify the condition of the motor mounts and transmission mounts.
6
Conduct a visual inspection of the drive axles and joints for any signs of wear or obstruction.

Solution

1. Preparation

Gather tools: OBD-II scanner, multimeter, socket set, torque wrench, and inspection mirror.
Ensure the vehicle is parked on a flat surface, and engage the parking brake.
Disconnect the 12V battery for safety.

2. Inspect Battery Connections

Reconnect the battery if disconnected.
Use a multimeter to check the voltage at the battery terminals. It should read around 12.6V.
Tighten any loose connections and clean corrosion as needed.

3. Check Powertrain Components

Open the hood and visually inspect the powertrain.
Look for any loose bolts or nuts on the motor mounts and transmission mounts; tighten to manufacturer's specifications if found loose.
Inspect the drive axles and joints for any damage or misalignment.

4. Test Motor Functionality

Reconnect the battery and start the vehicle.
Monitor the electric motors for unusual sounds and vibrations.
If a knocking sound persists, consider removing the motor cover and inspecting motor components for wear or damage.

5. Final Assembly and Testing

If all components are secure and no visible issues are found, reassemble any parts that were removed during inspection.
Torque all fasteners to the manufacturer’s specifications.
Start the vehicle again to test for the knocking noise.