my BMW 5 Series transmission slips when I accelerate what should I do

Solution

1. Preparation

• Gather all necessary tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check and Replace Transmission Fluid

1. Remove the transmission dipstick and wipe it clean.
2. Insert the dipstick back and remove it to check the fluid level.
3. If low, add the appropriate type of transmission fluid as specified in the owner’s manual.
4. If fluid is dark or has a burnt smell, proceed to replace the fluid.
5. To change the fluid, place a drain pan under the transmission and remove the drain plug or pan bolts.
6. Allow the old fluid to drain completely, then replace the drain plug and tighten to manufacturer specifications.

3. Replace Transmission Filter

1. Remove the transmission pan by unscrewing the bolts securing it in place.
2. Carefully lower the pan and remove the old filter.
3. Clean the pan thoroughly and inspect for metal shavings or debris.
4. Install the new filter, ensuring it is seated correctly.
5. Reinstall the transmission pan with a new gasket and torque the bolts to the specified values.

4. Inspect and Replace Solenoids (if necessary)

1. Locate the transmission solenoids, typically found inside the transmission body.
2. Disconnect the electrical connectors from the solenoids.
3. Remove the solenoids from their mounting locations.
4. Install new solenoids in the reverse order of removal and connect the electrical connectors.

5. Reconnect Battery and Test Drive

• Reconnect the battery.
• Start the engine and allow it to warm up while checking for leaks.
• Conduct a test drive to ensure proper shifting and operation.