how to fix the Tesla Model S Original (2012-2020) that has intermittent power loss

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

high

Severity

3 min read

567 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 intermittent power loss in Tesla Model S (2012-2020). 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 12V battery before working on high voltage systems.
•Allow the vehicle to cool down before starting any inspection or repair work.

Symptoms

•Sudden loss of acceleration power
•Dashboard warning lights illuminated
•Reduced regenerative braking capability
•Unresponsive throttle
•Vehicle entering 'limp mode' intermittently
•Decreased range or battery drain

Diagnostic Steps

1
Scan for error codes using a Tesla diagnostic tool to identify any stored errors related to the power loss.
2
Inspect battery connections, including the battery pack and contactor for corrosion or loose terminals.
3
Check high voltage system for any signs of faults or short circuits using a multimeter.
4
Examine the vehicle's firmware for any available updates that may address power management issues.
5
Monitor battery health and state of charge using the vehicle's onboard diagnostics.
6
Inspect the traction control system for any malfunctions or error codes.

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

•Tesla diagnostic tool
•Multimeter
•Torque wrench
•Socket set

Parts Required

•Dielectric grease (if corrosion is found)
•Replacement battery connectors (if severely corroded)

Related Faults

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Diagnostic Steps

1
Scan for error codes using a Tesla diagnostic tool to identify any stored errors related to the power loss.
2
Inspect battery connections, including the battery pack and contactor for corrosion or loose terminals.
3
Check high voltage system for any signs of faults or short circuits using a multimeter.
4
Examine the vehicle's firmware for any available updates that may address power management issues.
5
Monitor battery health and state of charge using the vehicle's onboard diagnostics.
6
Inspect the traction control system for any malfunctions or error codes.

Solution

1. Preparation

Tools Required: Tesla diagnostic tool, multimeter, torque wrench, socket set.
Ensure the vehicle is parked on a flat surface and the parking brake is engaged.
Disconnect the 12V battery to ensure safety while working on high voltage components.

2. Battery Connection Inspection

Tools Required: Socket set, torque wrench.
Remove the rear trunk cover to access the battery connections.
Inspect the battery connectors for corrosion or looseness.
Tighten any loose connections to manufacturer specifications (typically around 12-15 Nm).
Clean any corrosion using a wire brush and apply dielectric grease to prevent future corrosion.

3. High Voltage System Check

Tools Required: Multimeter.
Reconnect the 12V battery.
With the vehicle in "Off" mode, measure the voltage at the battery terminals using a multimeter.
Ensure voltage readings are within the manufacturer's specified range (typically around 350-400V for Model S).
If readings are out of range, consult Tesla service for a battery replacement or further diagnostics.

4. Firmware Update

Connect the vehicle to Wi-Fi and check for any available firmware updates through the vehicle settings.
Follow on-screen instructions to download and install updates.
Ensure the vehicle is fully charged or plugged in during the update process to prevent interruptions.

5. Traction Control System Inspection

Use the Tesla diagnostic tool to check for any DTCs related to the traction control system.
If errors are present, follow the manufacturer’s guidelines to reset or calibrate the system as necessary.