how do I fix the P0700 code on my Volkswagen Golf MK7 (2015-2019)?

Solution

1. Preparation

• Gather necessary tools and parts.
• Disconnect the vehicle battery to avoid electrical shorts.
• Raise the vehicle using a jack and secure it with jack stands for safety.

2. Check and Replace Transmission Fluid

• Tools Required: Socket set, funnel, drain pan
• Remove the transmission drain plug and allow the old fluid to drain completely.
• Inspect the old fluid for contaminants; if it appears burnt or metal shavings are present, further inspection of the transmission might be necessary.
• Replace with manufacturer-recommended transmission fluid, ensuring the correct level is reached by using a funnel to refill through the dipstick tube.
• Reinstall the drain plug and torque it to manufacturer specifications.

3. Inspect and Repair Wiring/Connections

• Tools Required: Wire brush, electrical contact cleaner, multimeter
• Inspect the wiring harness connected to the TCM for frayed or damaged wires.
• Clean any corrosion from connectors using electrical contact cleaner.
• Repair or replace any damaged wiring or connectors as needed.

4. Replace Transmission Control Module (if necessary)

• Tools Required: Socket set, torque wrench
• Disconnect the battery again before working on the TCM.
• Remove the TCM from its mounting bracket by unscrewing the bolts.
• Disconnect the wiring harness from the TCM.
• Install the new TCM by reversing the removal steps, ensuring all connections are secure.
• Torque the mounting bolts to the specified values.