how to fix P0701 code in BMW 3 Series F30/F31 (2012-2019)

BMW 3 Series F30/F31 (2012-2019)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0701

3 min read

575 words

Problem Statement

The P0701 code in a BMW 3 Series F30/F31 (2012-2019) indicates a malfunction in the transmission control system, specifically related to the Transmission Range Sensor (TRS) or the

Error Code

P0701

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

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

Symptoms

•Check engine light illuminated
•Transmission not shifting properly
•Slipping or harsh shifting during gear changes
•Vehicle stuck in one gear
•Reduced acceleration or power
•Transmission fluid leaks

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0701 and check for any other related codes.
2
Inspect the Transmission Range Sensor (TRS) connections and wiring for any signs of damage or corrosion.
3
Check the transmission fluid level and condition; look for any signs of contamination or burning.
4
Verify the operation of the TRS by testing its voltage and resistance using a multimeter.
5
Clear the codes and perform a test drive to see if the code reappears.
6
Inspect the Transmission Control Module (TCM) for proper function and connections.

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

•Inspect the wiring harness leading to the TRS for any frayed or damaged wires.
•Repair any damaged wiring using electrical tape or soldering as necessary.
•Ensure all connectors are clean and tight.

Parts Required

•Transmission Range Sensor
•Transmission fluid (specific to BMW specifications)

Related Faults

Share this solution

Comments

No comments yet

Be the first to share your thoughts

Back to Generation

Diagnostic Steps

1
Scan for error codes using an OBD-II scanner to confirm P0701 and check for any other related codes.
2
Inspect the Transmission Range Sensor (TRS) connections and wiring for any signs of damage or corrosion.
3
Check the transmission fluid level and condition; look for any signs of contamination or burning.
4
Verify the operation of the TRS by testing its voltage and resistance using a multimeter.
5
Clear the codes and perform a test drive to see if the code reappears.
6
Inspect the Transmission Control Module (TCM) for proper function and connections.

Solution

1. Preparation

Gather necessary tools and parts.
Ensure the vehicle is on level ground and secure it with wheel chocks.
Disconnect the battery to prevent electrical shorts.

2. Inspect and Repair Wiring

Tools Required: Multimeter, wire strippers, electrical tape, soldering iron (if needed).
Inspect the wiring harness leading to the TRS for any frayed or damaged wires.
Repair any damaged wiring using electrical tape or soldering as necessary.
Ensure all connectors are clean and tight.

3. Replace Transmission Range Sensor (if faulty)

Tools Required: Socket set, torque wrench, screwdrivers.
Locate the TRS on the transmission.
Remove the mounting bolts securing the TRS.
Disconnect the electrical connector from the sensor.
Install the new TRS:
- Connect the electrical connector.
- Secure the sensor with the mounting bolts, torque to manufacturer specifications (consult repair manual for torque value).

4. Check and Replace Transmission Fluid (if necessary)

Tools Required: Fluid pump, drain pan, funnel.
Drain the transmission fluid by removing the drain plug.
Inspect the old fluid; if it’s dark or has a burnt smell, replace it.
Refill with new transmission fluid that meets BMW specifications (consult owner’s manual for fluid type).
Reinstall the drain plug securely.

5. Reconnect Battery and Clear Codes

Reconnect the battery terminals and ensure they are tight.
Use the OBD-II scanner to clear the P0701 code.
Perform a test drive to ensure the transmission operates correctly.