my BMW 5 Series has a hard shifting transmission what's the problem

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the battery to ensure safety while working on electrical components.

2. Check Transmission Fluid

• Tools Required: Fluid pump, funnel, transmission fluid dipstick.
• Check the fluid level using the dipstick; if low, add the appropriate type of transmission fluid as specified in the owner's manual.
• If the fluid is dark or smells burnt, proceed to the fluid change.

3. Change Transmission Fluid and Filter

• Tools Required: Socket set, torque wrench, pan cleaner, new transmission filter and gasket, transmission fluid.
• Elevate the vehicle using jack stands.
• Remove the transmission pan bolts and carefully lower the pan.
• Discard the old fluid and clean the pan thoroughly.
• Replace the old filter with a new one.
• Install a new gasket and reattach the pan, torqueing the bolts to the manufacturer’s specifications.
• Refill with new transmission fluid through the dipstick tube.

4. Inspect and Replace Transmission Solenoids (if necessary)

• Tools Required: Socket set, torque wrench, multimeter.
• Access the transmission solenoids, often located on the valve body.
• Disconnect the electrical connectors and remove the solenoids.
• Test the solenoids for resistance using a multimeter; replace if faulty.
• Reinstall new solenoids and reconnect electrical connectors.

5. Reconnect Battery and Reset TCM

• Reconnect the battery terminals.
• Use the OBD-II scanner to reset any transmission-related error codes.
• Perform a relearn procedure for the TCM if applicable.