how to troubleshoot electric power steering problems in Tesla Model S Original (2012-2020)

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

543 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 troubleshoot electric power steering problems in Tesla Model S (2012-2020). Step-by-step guide for diagnosing and fixing EPS issues.

Affected Component

Steering

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems to prevent shock or short circuits.
•Follow proper lifting procedures if the vehicle needs to be elevated for access.

Symptoms

•Steering wheel feels heavy or difficult to turn
•Power steering warning light illuminated on the dashboard
•Intermittent loss of steering assist while driving
•No resistance in the steering wheel when turning
•Unusual noises when turning the steering wheel
•Error messages on the display related to steering

Diagnostic Steps

1
Check for any stored error codes using an OBD-II scanner to identify specific EPS faults.
2
Inspect the power steering fluid level and condition (if applicable) for any leaks or contamination.
3
Examine the battery voltage and health, ensuring it is within operational limits for EPS functionality.
4
Verify the electrical connections at the EPS motor and steering column for corrosion or loose connections.
5
Test the steering angle sensor for proper operation using diagnostic software.
6
Inspect the EPS control module for any signs of damage or failure.

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
•Electrical contact cleaner
•Socket set
•Screwdrivers (flathead and Phillips)
•Torque wrench

Parts Required

•EPS control module (if faulty)
•Steering angle sensor (if faulty)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Symptoms

•Steering wheel feels heavy or difficult to turn

•Power steering warning light illuminated on the dashboard

•Intermittent loss of steering assist while driving

•No resistance in the steering wheel when turning

•Unusual noises when turning the steering wheel

•Error messages on the display related to steering

Diagnostic Steps

1
Check for any stored error codes using an OBD-II scanner to identify specific EPS faults.
2
Inspect the power steering fluid level and condition (if applicable) for any leaks or contamination.
3
Examine the battery voltage and health, ensuring it is within operational limits for EPS functionality.
4
Verify the electrical connections at the EPS motor and steering column for corrosion or loose connections.
5
Test the steering angle sensor for proper operation using diagnostic software.
6
Inspect the EPS control module for any signs of damage or failure.

Solution

1. Preparation

Gather tools and parts required for the repair.
Ensure the vehicle is parked on a level surface and the ignition is off.
Disconnect the 12V battery to prevent any electrical shock during the repair.

2. Inspect and Clean Electrical Connections

Remove the lower steering column cover to access the EPS motor and connectors.
Visually inspect the connectors for corrosion or damage.
Use electrical contact cleaner to clean the connectors, allowing them to dry completely before reassembly.
Reconnect the connectors securely.

3. Replace Faulty Components

If the EPS control module is faulty, remove it by unscrewing the mounting bolts and disconnecting wiring harnesses.
Install the new EPS control module, ensuring all connections are secure and correctly oriented.
If the steering angle sensor is defective, disconnect it, remove any mounting screws, and replace it with a new sensor.

4. Reassemble and Reconnect Battery

Reinstall the lower steering column cover, ensuring all clips are secured.
Reconnect the 12V battery and ensure all electrical systems are functioning properly.
Clear any error codes using the OBD-II scanner.

5. Calibration

Perform a steering angle sensor calibration using diagnostic software to ensure proper EPS functionality.
Follow the manufacturer's guidelines for recalibration procedures.