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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/how to troubleshoot transmission jerking in my BMW 3 Series F30/F31 (2012-2019)

how to troubleshoot transmission jerking in my BMW 3 Series F30/F31 (2012-2019)

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: medium2-4 hours
4 min read
673 words

Problem Statement

## Problem Statement The vehicle experiences transmission jerking during acceleration or shifting, indicating potential issues with the transmission system in a BMW 3 Series F30/F31 (2012-2019).

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Allow the engine to cool before opening the hood.
  • ⚠Use caution when working under the vehicle.

Symptoms

  • •Jerking or harsh shifting during acceleration
  • •Delayed engagement or slipping of transmission
  • •Unusual noises from the transmission area (clunking or whining)
  • •Check engine light illuminated
  • •Poor fuel economy
  • •Transmission fluid leaks

Diagnostic Steps

  1. 1Scan for Error Codes**: Use an OBD-II scanner to check for any stored error codes related to the transmission.
  2. 2Check Transmission Fluid Level**: Ensure the transmission fluid is at the appropriate level and condition; look for burnt smell or discoloration.
  3. 3Inspect Transmission Fluid Quality**: Check for contamination or metal shavings in the fluid.
  4. 4Examine Transmission Mounts**: Inspect the transmission mounts for any signs of wear or damage that could cause misalignment.
  5. 5Test Transmission Sensors**: Verify the operation of the transmission speed sensors and throttle position sensor.
  6. 6Road Test the Vehicle**: Take the vehicle for a test drive to replicate the jerking issue and observe conditions under which it occurs.

Solution

Solution

1. Preparation

  • Tools Required: OBD-II scanner, transmission fluid dipstick, socket set, torque wrench, and funnel.
  • Ensure the vehicle is parked on a level surface and the engine is off.
  • Allow the vehicle to cool down before starting work.

2. Check and Replace Transmission Fluid

  1. Locate the Transmission Dipstick: Open the hood and locate the transmission fluid dipstick.
  2. Remove Dipstick: Pull the dipstick out and wipe it clean with a lint-free cloth.
  3. Check Fluid Level: Reinsert the dipstick and remove it again to check the fluid level.
    • If low, add the appropriate type of transmission fluid (consult owner's manual for specification).
  4. Examine Fluid Condition: If the fluid is dark or has a burnt smell, it should be replaced.
  5. Drain Old Fluid:
    • Place a drain pan under the transmission pan.
    • Remove the transmission pan bolts and lower the pan to drain old fluid.
  6. Replace Filter:
    • Remove the old filter and replace it with a new one.
    • Ensure the new filter is seated properly.
  7. Reinstall Transmission Pan: Clean the sealing surface, apply new gasket or sealant, and reinstall the pan with the correct torque specifications.
  8. Refill Transmission Fluid: Using a funnel, refill the transmission with the correct fluid type through the dipstick tube.

3. Check and Replace Transmission Mounts

  1. Visual Inspection: Check the condition of the transmission mounts for cracks or excessive wear.
  2. Remove Old Mounts: If damaged, support the transmission with a jack and remove the bolts securing the mounts.
  3. Install New Mounts: Position the new mounts and secure them with bolts to the specified torque.

4. Test Transmission Sensors

  1. Access Sensors: Locate and disconnect the electrical connectors from the transmission speed sensors.
  2. Check Resistance: Using a multimeter, test the resistance of the sensors against manufacturer specifications.
  3. Replace Faulty Sensors: If any sensor is out of spec, replace it with a new sensor.

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
  • Transmission fluid dipstick
  • Socket set
  • Torque wrench
  • Funnel
  • Multimeter

Parts Required

  • Transmission fluid (specific to BMW specifications)
  • Transmission filter
  • Transmission mounts (if needed)
  • Transmission speed sensors (if needed)

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

4 items

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