how to diagnose transmission problems in my Volkswagen Golf MK7.5 (2020-Present)

Solution

1. Preparation

• Ensure the vehicle is parked on a level surface and the engine is off.
• Gather necessary tools: OBD-II scanner, fluid pressure gauge, socket set, and basic hand tools.

2. Address Fluid Issues

1. Check Fluid Level:

   • Remove the transmission dipstick (if equipped) or access the fill plug.
   • Wipe the dipstick clean and reinsert it to check the level.
   • If low, add the appropriate type of VW transmission fluid (consult the owner’s manual for specifications).

2. Change Fluid:

   • Raise the vehicle safely using jack stands.
   • Place a drain pan under the transmission pan.
   • Remove the transmission pan bolts and carefully lower the pan to drain fluid.
   • Replace the filter if applicable and reinstall the pan using a new gasket.
   • Fill the transmission with fresh fluid as per manufacturer specifications.

3. Repair Electrical Issues

1. Inspect Wiring:

   • Disconnect the battery before working on electrical components.
   • Inspect the wiring harness and connectors to the TCM and transmission for damage.
   • Repair or replace any damaged wiring or connectors.

2. Replace TCM (if necessary):

   • Remove the TCM from its mounting location.
   • Disconnect the electrical connectors.
   • Install the new TCM and reconnect the electrical connectors securely.

4. Testing

• After repairs, reconnect the battery and clear any stored error codes with the OBD-II scanner.
• Conduct a road test to ensure proper shifting and functionality of the transmission.