why does my Tesla Model S Original (2012-2020) have a loss of steering power

Tesla Model S Plaid/Refresh (2021-present)

Error Codes

2-4 hours

Time

medium

Difficulty

critical

Severity

3 min read

507 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 loss of steering power in Tesla Model S (2012-2020). Step-by-step guide with diagnostic procedures and repair instructions.

Affected Component

Steering

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Ensure the vehicle is secure and on a level surface before starting repairs.

Symptoms

•Steering feels heavy or unresponsive
•Warning message on the dashboard related to power steering
•Difficulty in maneuvering the vehicle at low speeds
•Unusual noises when turning the steering wheel
•Possible vibrations felt through the steering wheel

Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the steering system.
2
Inspect the power steering fluid levels, if applicable, and check for leaks in the system.
3
Examine the steering column and electronic power steering (EPS) motor for visible damage or disconnections.
4
Test the EPS motor voltage and ground connections using a multimeter.
5
Check for software updates or recalls that might be related to the steering system.
6
Perform a visual inspection of the power steering module and associated wiring harness for signs of wear or damage.

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
•Screwdriver
•Torque wrench
•Multimeter

Parts Required

•Electric power steering motor (if faulty)
•Steering angle sensor (if faulty)

Related Faults

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Diagnostic Steps

1
Scan the vehicle’s onboard diagnostics (OBD-II) for any error codes related to the steering system.
2
Inspect the power steering fluid levels, if applicable, and check for leaks in the system.
3
Examine the steering column and electronic power steering (EPS) motor for visible damage or disconnections.
4
Test the EPS motor voltage and ground connections using a multimeter.
5
Check for software updates or recalls that might be related to the steering system.
6
Perform a visual inspection of the power steering module and associated wiring harness for signs of wear or damage.

Solution

1. Preparation

Ensure the vehicle is parked on a level surface with the ignition turned off.
Disconnect the 12-volt battery to prevent any electrical shock or short circuits.
Gather necessary tools and parts for repair.

2. Inspect and Replace EPS Motor

Sub-steps:
1. Remove the lower steering column cover using a screwdriver.
2. Disconnect the wiring harness from the EPS motor.
3. Unbolt the EPS motor from its mounting bracket using a socket set.
4. Install the new EPS motor by reversing the disassembly steps.
Tools Required: Socket set, screwdriver, torque wrench.

3. Check and Replace Steering Angle Sensor

Sub-steps:
1. Locate the steering angle sensor on the steering column.
2. Disconnect the sensor's wiring harness.
3. Remove the sensor from its mounting position.
4. Install the new steering angle sensor and reconnect the wiring harness.
Tools Required: Screwdriver, torque wrench.

4. Reconnect Battery and Clear Codes

Reconnect the 12-volt battery.
Use an OBD-II scanner to clear any existing error codes.
Perform a steering calibration through the vehicle’s service menu if applicable.