how to diagnose P0720 code on BMW 5 Series F10/F11 (2010-2017)

BMW 5 Series F10/F11 (2010-2017)

Error Codes

1-2 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0720

3 min read

462 words

Problem Statement

The P0720 code indicates a problem with the output speed sensor circuit on a BMW 5 Series F10/F11 (2010-2017), which can affect transmission performance and vehicle operation.

Error Code

P0720

Estimated Time

1-2 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the engine and transmission to cool before servicing.

Symptoms

•Check engine light illuminated
•Erratic or harsh shifting
•Transmission slipping or failure to engage
•Speedometer not functioning or inaccurate
•Decreased fuel efficiency

Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes and note any additional codes present.
2
Inspect the vehicle's wiring and connectors associated with the output speed sensor for damage or corrosion.
3
Test the output speed sensor's resistance using a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle's transmission fluid level and condition; low or contaminated fluid can affect sensor performance.
5
Monitor the output speed sensor signal using a scan tool while driving to confirm it is transmitting data correctly.

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
•Torque wrench

Parts Required

•Output speed sensor (if faulty)
•Transmission fluid (if low)

Related Faults

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Diagnostic Steps

1
Scan the vehicle's OBD-II system for error codes and note any additional codes present.
2
Inspect the vehicle's wiring and connectors associated with the output speed sensor for damage or corrosion.
3
Test the output speed sensor's resistance using a multimeter to ensure it is within manufacturer specifications.
4
Check the vehicle's transmission fluid level and condition; low or contaminated fluid can affect sensor performance.
5
Monitor the output speed sensor signal using a scan tool while driving to confirm it is transmitting data correctly.

Solution

1. Preparation

Gather tools and parts required for the repair.
Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Remove the Output Speed Sensor

Locate the output speed sensor on the transmission. Refer to the service manual for exact placement.
Use a socket set to remove the sensor mounting bolts.
Carefully disconnect the wiring harness from the sensor.

3. Inspect and Replace the Sensor

Inspect the old sensor for signs of wear or damage.
If the sensor is faulty, install the new output speed sensor by reversing the removal process:
- Connect the wiring harness to the new sensor.
- Secure the sensor with the mounting bolts and tighten them to the manufacturer's torque specifications (usually around 10-15 Nm).

4. Reconnect Battery and Clear Codes

Reconnect the vehicle's battery.
Use an OBD-II scanner to clear any stored codes from the system.

5. Test the Vehicle

Start the vehicle and take it for a test drive to ensure proper operation.
Monitor the transmission performance and check for any new error codes.