how to fix Tesla Model S Original (2012-2020) transmission slipping when shifting

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

539 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 transmission slipping in Tesla Model S (2012-2020). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical components.
•Allow the vehicle to cool before performing any repairs on the transmission.

Symptoms

•Transmission fails to engage smoothly when shifting between gears
•Increased engine RPM without corresponding acceleration
•Unusual noises during gear shifts (grinding or whining)
•Warning messages related to transmission or drivetrain on the dashboard
•Decreased overall performance and responsiveness

Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the transmission.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission control module (TCM) for any software updates or faults.
4
Perform a visual inspection of the transmission wiring harness for damage or corrosion.
5
Monitor the operation of the transmission during a test drive to evaluate shift quality and timing.

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
•Fluid pump
•Torque wrench
•Drain pan

Parts Required

•Tesla recommended transmission fluid
•Replacement wiring harness (if damaged)

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Symptoms

•Transmission fails to engage smoothly when shifting between gears

•Increased engine RPM without corresponding acceleration

•Unusual noises during gear shifts (grinding or whining)

•Warning messages related to transmission or drivetrain on the dashboard

•Decreased overall performance and responsiveness

Diagnostic Steps

1
Scan the vehicle's OBD-II system for any error codes related to the transmission.
2
Check the transmission fluid level and condition; look for discoloration or burnt smell.
3
Inspect the transmission control module (TCM) for any software updates or faults.
4
Perform a visual inspection of the transmission wiring harness for damage or corrosion.
5
Monitor the operation of the transmission during a test drive to evaluate shift quality and timing.

Solution

1. Preparation

Gather tools and parts required for the repair.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the vehicle's 12V battery to ensure safety during electronic repairs.

2. Check Transmission Fluid

Remove the transmission fluid fill plug.
Insert a dipstick or similar tool to check fluid level.
If the fluid is low, add the recommended Tesla transmission fluid until it reaches the proper level.
If the fluid is discolored or burnt, proceed to a fluid change.

3. Change Transmission Fluid

Tools Required: Socket set, fluid pump, transmission fluid (recommended by Tesla), drain pan.
Place a drain pan under the transmission.
Remove the transmission drain plug and allow the fluid to fully drain.
Reinstall the drain plug and torque to manufacturer specifications.
Use a fluid pump to fill the transmission with fresh fluid through the fill plug.
Ensure the fluid level is correct again after filling.

4. Update Transmission Control Module (TCM)

Reconnect the 12V battery and power on the vehicle.
Use Tesla's diagnostic tool or software to check for TCM updates.
If updates are available, follow the prompts to apply the software updates to the TCM.

5. Inspect and Repair Wiring

Inspect the wiring harness connected to the TCM and transmission for any signs of wear or damage.
Repair or replace any damaged wiring as necessary.
Ensure all connectors are secure and free of corrosion.