FAULTBASE
Error CodesASKCars
© 2025 FAULTBASE
All rights reserved.
v2.0.0 • Production
ContactPrivacyImpressum
Home/Cars/Subaru/Outback/5th Generation (2015-2019)/how to fix C0040 code in Tesla Outback 5th Generation (2015-2019)?

how to fix C0040 code in Tesla Outback 5th Generation (2015-2019)?

Subaru Outback 5th Generation (2015-2019)

Error Codes
Severity: highDifficulty: mediumError Code: C00401-2 hours
3 min read
498 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 C0040 wheel speed sensor issues in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with tools and procedures.

Error Code
C0040
Affected Component
Brakes
Estimated Time
1-2 hours

Safety Warnings

  • ⚠Disconnect the battery before working on electrical components.
  • ⚠Ensure the vehicle is securely supported on jack stands before working underneath.

Symptoms

  • •ABS warning light illuminated on the dashboard
  • •Traction control warning light activated
  • •Erratic speedometer readings
  • •Unusual braking behavior or pulsation
  • •Vehicle pulling to one side during braking

Diagnostic Steps

  1. 1Scan the vehicle's onboard computer using an OBD-II scanner to confirm the C0040 code and check for any related codes.
  2. 2Visually inspect the left front wheel speed sensor and wiring for damage, corrosion, or loose connections.
  3. 3Check the wheel speed sensor signal using a multimeter to ensure it is within the manufacturer's specified range.
  4. 4Inspect the ABS module connections and wiring harness for any signs of wear or damage.
  5. 5Test drive the vehicle while monitoring the ABS system to see if the C0040 code reappears or if any symptoms persist.

Solution

Solution

1. Preparation

  • Gather tools and parts needed for the repair.
  • Disconnect the negative battery terminal to ensure safety.

2. Remove Wheel

  • Loosen the lug nuts on the left front wheel using a socket set.
  • Jack up the vehicle and securely place it on jack stands.
  • Remove the lug nuts and take off the left front wheel.

3. Replace Wheel Speed Sensor

  • Locate the wheel speed sensor mounted near the brake rotor.
  • Disconnect the electrical connector from the wheel speed sensor.
  • Remove the mounting bolt(s) securing the sensor using a socket set.
  • Carefully pull out the old sensor from its housing.
  • Install the new wheel speed sensor by inserting it into the housing and securing it with the bolt(s).
  • Reconnect the electrical connector to the new sensor.

4. Reassemble and Test

  • Reinstall the left front wheel and tighten the lug nuts to the manufacturer’s specified torque (typically 80-100 ft-lbs).
  • Lower the vehicle from the jack stands.
  • Reconnect the negative battery terminal.
  • Start the vehicle and check for any warning lights on the dashboard.

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
  • •Jack and jack stands
  • •Multimeter

Parts Required

  • •New left front wheel speed sensor

Additional Information

Error Code
C0040
Affected Component
Brakes
Estimated Time
1-2 hours
Difficulty
medium
Severity
high
Tools Required
4 items
Parts Required
1 item

Related Faults

  1. how to troubleshoot P0420 code on Tesla Outback 5th Generation (2015-2019)

    Learn how to troubleshoot and fix P0420 exhaust system issue in 2015-2019 Subaru Outback. Step-by-step guide with diagnostic procedures and repair instructions.

    P0420Exhaust System6 symptoms

  2. what does the P0700 code mean for Tesla Outback 5th Generation (2015-2019)?

    Learn how to diagnose and fix P0700 transmission control malfunction in Tesla Outback 5th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

    P0700Transmission6 symptoms

  3. how to reset the service light on Tesla Outback 5th Generation (2015-2019)

    Learn how to reset the service light on a 2015-2019 Tesla Outback. Step-by-step guide with diagnostic procedures and reset instructions.

    Electrical3 symptoms

  4. how to fix a slipping clutch in my Tesla Outback 5th Generation (2015-2019)?

    Learn how to diagnose and fix a slipping clutch in Tesla Outback 5th Generation (2015-2019). Step-by-step guide with tools and safety tips.

    Transmission5 symptoms

  5. how to reset the maintenance light on my Tesla Outback 5th Generation (2015-2019)?

    Learn how to reset the maintenance light on your Tesla Outback (2015-2019). Step-by-step guide for a quick and easy reset process.

    Electrical3 symptoms

  6. how to fix P0420 code on my Tesla Outback 5th Generation (2015-2019)

    Learn how to diagnose and fix P0420 catalytic converter efficiency issues in Tesla Outback 5th Generation. Step-by-step guide with diagnostic procedures and repair instructions.

    P0420Exhaust System5 symptoms

Share this solution

Comments

Sign in to share your thoughts

Sign In

No comments yet

Be the first to share your thoughts

Back to Generation