my Volkswagen Golf MK7 (2015-2019) feels like it's slipping gears

Solution

1. Preparation

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

2. Check and Replace Transmission Fluid

• Tools Required: Transmission fluid pump, socket set, fluid catch pan
• Remove the transmission pan bolts using a socket set.
• Carefully lower the transmission pan and allow fluid to drain into the catch pan.
• Inspect the pan for metal shavings or debris; clean if necessary.
• Replace the old filter (if applicable) by removing the old filter and installing the new one.
• Reinstall the transmission pan with a new gasket, tightening bolts to manufacturer specifications (usually around 10 Nm).
• Refill the transmission with the appropriate type of fluid through the dipstick tube or fill port.

3. Inspect and Repair Wiring/Connectors

• Tools Required: Multimeter, wire crimping tool
• Visually inspect all wiring harnesses and connectors leading to the TCM and transmission for wear or damage.
• Use a multimeter to test for continuity and proper voltage at the connectors; repair or replace as necessary.

4. TCM Reprogramming/Replacement

• Tools Required: OBD-II scanner capable of programming
• If codes indicate TCM issues, reprogram the TCM using an OBD-II scanner following manufacturer instructions.
• If reprogramming fails, replace the TCM by disconnecting it, removing mounting screws, and installing a new unit.