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Home/Cars/BMW/3 Series/E90/E91 (2005-2012)/why does my BMW 3 Series E90/E91 (2005-2012) transmission slip when I accelerate

why does my BMW 3 Series E90/E91 (2005-2012) transmission slip when I accelerate

BMW 3 Series E90/E91 (2005-2012)

Severity: mediumDifficulty: medium2-4 hours
3 min read
577 words

Problem Statement

## Problem Statement The BMW 3 Series E90/E91 (2005-2012) is experiencing transmission slippage during acceleration, which typically indicates an issue with the transmission system.

Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect the battery before working on electrical systems to prevent short circuits or damage.
  • ⚠Allow the engine to cool before handling the transmission fluid.

Symptoms

  • •Transmission slips during acceleration
  • •Delayed or harsh shifting between gears
  • •Engine RPM increases without corresponding vehicle speed
  • •Warning lights illuminated on the dashboard
  • •Fluid leaks under the vehicle
  • •Unusual noises (e.g., whining or grinding) from the transmission

Diagnostic Steps

  1. 1Check Transmission Fluid Level**: Inspect the transmission fluid level using the dipstick and ensure it is at the recommended level.
  2. 2Scan for Diagnostic Trouble Codes (DTCs)**: Use an OBD-II scanner to identify any stored fault codes related to the transmission.
  3. 3Inspect Transmission Fluid Condition**: Examine the fluid for signs of contamination or burning; it should be reddish and clear.
  4. 4Check for External Leaks**: Visually inspect the transmission housing and surrounding areas for any signs of fluid leaks.
  5. 5Perform a Visual Inspection of Transmission Components**: Look for damaged or worn components, such as the transmission mount and linkage.
  6. 6Test the Torque Converter**: If applicable, perform a stall test to determine if the torque converter is functioning properly.

Solution

Solution

1. Preparation

  • Tools Required: OBD-II scanner, transmission fluid dipstick, fluid catch pan, torque wrench, socket set, screwdrivers.
  • Safety Warnings: Ensure the vehicle is on a level surface, and disconnect the battery before working on electrical components.

2. Change Transmission Fluid and Filter

  1. Raise the Vehicle: Use jack stands to elevate the vehicle securely.
  2. Drain the Transmission Fluid:
    • Locate the transmission pan and remove the drain plug (or pan) to allow fluid to drain completely into the catch pan.
  3. Remove Transmission Pan:
    • Unbolt the transmission pan, carefully detach it, and clean the pan and magnet for debris.
  4. Replace Transmission Filter:
    • Remove the old filter and install a new transmission filter, ensuring it is properly seated.
  5. Reinstall Transmission Pan:
    • Use a new gasket or sealant, if required, and torque bolts to manufacturer specifications (typically around 8-10 Nm).
  6. Refill Transmission Fluid:
    • Use the appropriate type of transmission fluid (refer to the owner’s manual) and refill through the dipstick tube until the correct level is reached.

3. Check Transmission Control Module (TCM) Settings

  1. Reprogram or Reset TCM:
    • If there are DTCs related to the TCM, follow the manufacturer's procedure for reprogramming or resetting it using the OBD-II scanner.

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
  • Fluid catch pan
  • Torque wrench
  • Socket set
  • Screwdrivers

Parts Required

  • Transmission fluid (specific to BMW specifications)
  • Transmission filter
  • Gasket or sealant for the transmission pan

Additional Information

Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

6 items

Parts

3 items

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