how to fix the Tesla Model S Original (2012-2020) rear motor malfunction

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

4 min read

611 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 rear motor malfunction in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Electrical

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the high-voltage battery before working on the rear motor to prevent electric shock
•Allow the vehicle to sit for a minimum of 15 minutes after disconnecting the battery to ensure capacitors are discharged

Symptoms

•Warning message on the dashboard regarding the rear motor
•Loss of power to the rear wheels
•Unusual noises from the rear motor area
•Inconsistent acceleration
•Check powertrain alert illuminated

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect the wiring harness and connectors leading to the rear motor for damage, corrosion, or loose connections
3
Check the rear motor's power supply by measuring voltage at the motor terminals with a multimeter
4
Perform a visual inspection of the rear motor for signs of physical damage or leakage
5
Examine the inverter for faults
6
Monitor temperature of the rear motor to check for overheating issues

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
•Safety gloves

Parts Required

•Rear motor (if replacement is necessary)
•Wiring harness (if damaged)
•Connectors (if corroded or damaged)

Related Faults

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Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect the wiring harness and connectors leading to the rear motor for damage, corrosion, or loose connections
3
Check the rear motor's power supply by measuring voltage at the motor terminals with a multimeter
4
Perform a visual inspection of the rear motor for signs of physical damage or leakage
5
Examine the inverter for faults
6
Monitor temperature of the rear motor to check for overheating issues

Solution

1. Preparation

Tools Needed: OBD-II scanner, multimeter, socket set, torque wrench, and safety gloves.
Safety Warning: Disconnect the high-voltage battery before working on the rear motor to prevent electric shock.

2. Disconnect Battery

Locate the high-voltage battery disconnect switch and turn it off.
Remove the negative terminal from the 12V battery as an additional safety precaution.

3. Remove Motor Cover

Use a socket set to remove the bolts securing the rear motor cover.
Carefully lift off the cover and set it aside to access the motor.

4. Inspect and Test Wiring

Check the wiring harness for any visible damage or corrosion.
Use a multimeter to test for continuity and voltage at the motor terminals. Ensure proper voltage is being delivered.

5. Replace Faulty Components

If any faults are found in the wiring or connectors, replace them with OEM parts.
If the motor or inverter is faulty, carefully remove the motor by unscrewing the mounting bolts, disconnecting all electrical connectors, and pulling the motor out.
Install the new rear motor or inverter by reversing the removal steps and ensuring all connections are secure.

6. Reassemble and Test

Reattach the motor cover and secure it with the previously removed bolts.
Reconnect the battery terminals and turn on the high-voltage battery disconnect switch.
Perform a system check using the OBD-II scanner to ensure no error codes are present.