how to diagnose the P0700 code on my Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

Error Code: P0700

3 min read

575 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 to diagnose and fix P0700 transmission control system malfunction in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures.

Error Code

P0700

Affected Component

Transmission

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the 12V battery before working on electrical components to avoid shock or shorts
•Ensure the transmission is cool before inspecting or servicing fluid levels

Symptoms

•Check engine light illuminated
•Unusual shifting behavior or harsh shifts
•Loss of power during acceleration
•Increased battery consumption
•Reduced regenerative braking efficiency

Diagnostic Steps

1
Scan for error codes using OBD-II scanner
2
Inspect transmission fluid level
3
Check for software updates
4
Perform visual inspection for leaks and damaged wiring
5
Test TCM communication with diagnostic tool
6
Monitor transmission temperature

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
•Fluid pump
•Torque wrench

Parts Required

•Transmission fluid (manufacturer-recommended type)
•Transmission Control Module (if replacement is necessary)

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Solution

1. Preparation

Tools Required: OBD-II scanner, multimeter, socket set, fluid pump, torque wrench.
Disconnect the vehicle's 12V battery to prevent electrical shock or short circuits.

2. Address Fluid Issues

Check Fluid Level: Remove the transmission fill plug and check the fluid level. If low, add the manufacturer-recommended transmission fluid until the level is correct.
Change Fluid if Necessary: If the fluid is dark or smells burnt, perform a fluid change.
- Sub-steps:
  1. Place a drain pan under the transmission.
  2. Remove the drain plug and let old fluid drain out.
  3. Replace the drain plug and torque to manufacturer specifications.
  4. Refill with new transmission fluid using a fluid pump until it reaches the proper level.

3. Reprogram TCM (if required)

Update Software: Using the Tesla service tool, check for and apply any software updates for the TCM.
- Sub-steps:
  1. Connect the diagnostic tool to the vehicle.
  2. Navigate to the TCM software section.
  3. Follow prompts to update if updates are available.

4. Repair or Replace TCM

Inspect and Replace TCM: If communication tests fail, the TCM may need to be replaced.
- Sub-steps:
  1. Locate the TCM (generally near the transmission).
  2. Disconnect the wiring harness.
  3. Remove mounting bolts and take out the old TCM.
  4. Install the new TCM and secure with bolts.
  5. Reconnect the wiring harness and ensure a secure fit.