my Volkswagen Golf MK7 (2015-2019) transmission slips when shifting, why?

Solution

1. Preparation

• Gather tools: OBD-II scanner, socket set, fluid pump, multimeter, torque wrench.
• Ensure the vehicle is on a level surface and the engine is cool.
• Disconnect the battery for safety.

2. Check and Replace Transmission Fluid

• Fluid Level Check

  • Locate the transmission dipstick or fill plug.
  • Remove the dipstick or fill plug and check the fluid level.
  • Add the appropriate transmission fluid if low (refer to owner’s manual for specifications).

• Fluid Replacement

  • If the fluid is dirty or burnt, replace it.
  • Use a fluid pump to drain the old fluid from the transmission pan.
  • Remove the transmission pan bolts and lower the pan.
  • Replace the transmission filter (if applicable) and install a new gasket.
  • Reattach the pan and torque bolts to manufacturer specifications (usually around 8-10 Nm).
  • Refill the transmission with new fluid through the dipstick or fill plug.

3. Inspect and Replace Transmission Solenoids

• Remove the transmission access cover if necessary.
• Disconnect the electrical connectors from the solenoids.
• Use a multimeter to test each solenoid for proper resistance (typically around 20-30 ohms).
• Replace any malfunctioning solenoids with new ones.
• Reassemble the access cover and reconnect the battery.

4. Inspect Clutch Packs or Torque Converter (if applicable)

• If the issue persists, remove the transmission from the vehicle.
• Inspect the clutch packs for wear or damage (manual).
• Replace any worn clutch discs and reassemble.
• For automatic transmissions, check the torque converter for failure signs and replace if necessary.