how to fix the P0720 code in my BMW X5 F15 (2014-2019)

BMW X5 F15 (2014-2019)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0720

3 min read

536 words

Problem Statement

The P0720 code indicates a malfunction in the vehicle speed sensor circuit in a 2014-2019 BMW X5 F15, affecting the transmission's ability to determine the vehicle speed.

Error Code

P0720

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Always disconnect the battery before working on electrical components to avoid short circuits.

Symptoms

•Check engine light illuminated
•Erratic transmission shifting
•Speedometer malfunction or inaccurate readings
•Engine stalling during gear changes
•Poor fuel economy
•Transmission slipping or failing to engage

Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the vehicle speed sensor (VSS) wiring and connectors for damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within manufacturer specifications.
4
Check the sensor signal at the ECM (Engine Control Module) for the correct voltage and waveform.
5
Inspect the transmission fluid for contamination or low levels that may affect sensor performance.
6
Verify the function of the ABS (Anti-lock Braking System) module, which may also influence vehicle speed readings.

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 (including extensions)
•Torque wrench
•Screwdriver set

Parts Required

•Vehicle speed sensor (if faulty)

Related Faults

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Diagnostic Steps

1
Scan the vehicle with an OBD-II scanner to confirm the P0720 code and check for any additional codes.
2
Inspect the vehicle speed sensor (VSS) wiring and connectors for damage or corrosion.
3
Measure the resistance of the vehicle speed sensor using a multimeter to ensure it is within manufacturer specifications.
4
Check the sensor signal at the ECM (Engine Control Module) for the correct voltage and waveform.
5
Inspect the transmission fluid for contamination or low levels that may affect sensor performance.
6
Verify the function of the ABS (Anti-lock Braking System) module, which may also influence vehicle speed readings.

Solution

1. Preparation

Gather necessary tools and parts.
Park the vehicle on a level surface and engage the parking brake.
Disconnect the negative battery terminal to prevent electrical shock.

2. Remove the Speed Sensor

Locate the vehicle speed sensor on the transmission (refer to the vehicle's service manual for exact location).
Remove any protective covers if necessary using a socket set.
Disconnect the electrical connector from the speed sensor.
Unscrew the sensor using the appropriate socket and remove it from the transmission.

3. Inspect and Test the Sensor

Visually inspect the sensor for signs of wear or damage.
Use a multimeter to check the resistance of the speed sensor. Compare the reading with manufacturer specifications.
If the sensor is faulty, proceed to replace it.

4. Install the New Sensor

Apply a small amount of thread sealant to the threads of the new speed sensor if recommended by the manufacturer.
Insert the new sensor into the transmission and tighten it to the manufacturer's torque specification (typically around 10-15 Nm).
Reconnect the electrical connector securely.

5. Reassemble and Test

Reinstall any protective covers removed during the process.
Reconnect the negative battery terminal.
Start the vehicle and allow it to idle for a few minutes.