my Volkswagen Golf MK7 (2015-2019) transmission slips when shifting gears

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to ensure safety while working on electrical components.
• Raise the vehicle using a jack and secure it on jack stands.

2. Fluid Change

1. Drain Old Fluid

   • Place a drain pan under the transmission pan.
   • Remove the transmission pan bolts with a socket set.
   • Carefully lower the pan and drain the old fluid completely.

2. Replace Filter

   • Remove the old transmission filter if applicable.
   • Clean the filter mounting surface and install the new filter according to manufacturer specifications.

3. Install New Fluid

   • Reattach the transmission pan with a new gasket, tightening bolts to the specified torque (typically around 8-10 Nm).
   • Fill the transmission with new fluid using a funnel, ensuring to use the correct type of fluid specified by the manufacturer (usually VW G 052 162 A2 or equivalent).

3. Electrical Inspection

1. Inspect Wiring

   • Check all wiring connectors to the TCM for signs of wear or corrosion.
   • Repair or replace any damaged wires or connectors as necessary.

2. Reprogram TCM (if necessary)

   • Using a diagnostic tool, reprogram the TCM to ensure it is calibrated correctly for the new fluid or components.

4. Test Drive

• Lower the vehicle back to the ground, reconnect the battery, and perform a test drive to ensure that the transmission shifts smoothly without slipping.