what causes transmission slipping in my Volkswagen Passat B8 (2015-2022)?

Solution

1. Preparation

• Gather necessary tools and parts for repair.
• Ensure the vehicle is parked on a level surface and the engine is cool.
• Disconnect the battery to prevent electrical shorts.

2. Check and Replace Transmission Fluid

• Sub-steps:
  1. Remove the transmission dipstick and wipe it clean.
  2. Insert the dipstick back and remove it again to check fluid level.
  3. If low, add the specified transmission fluid (check owner's manual for type).
  4. If fluid is burnt or contaminated, proceed to drain and replace.
• Tools Required: Transmission fluid pump, funnel, and appropriate transmission fluid.
• Safety Warnings: Use gloves to avoid skin contact with transmission fluid.

3. Inspect and Replace Transmission Filter

• Sub-steps:
  1. Remove the transmission pan bolts and carefully lower the pan.
  2. Replace the old filter with a new filter, ensuring it is secured properly.
  3. Clean the transmission pan and replace the gasket before reinstallation.
  4. Reinstall the transmission pan and torque the bolts to manufacturer's specifications.
• Tools Required: Socket set, torque wrench, and gasket scraper.
• Safety Warnings: Ensure the vehicle is securely lifted if needed.

4. Electronic Control Check

• Sub-steps:
  1. Reconnect the battery.
  2. Use a scan tool to check for any fault codes related to the TCM.
  3. If issues are detected, reprogram or replace the TCM as necessary.
• Tools Required: OBD-II scanner.
• Safety Warnings: Ensure all connections are secure to avoid electrical issues.