how to fix P0700 transmission code on Volkswagen Passat B8 (2015-2022)

Learn how to diagnose and fix P0700 transmission fault in Volkswagen Passat B8. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather all necessary tools and parts.
• Disconnect the vehicle battery to prevent electrical shorts.
• Ensure the vehicle is on a level surface and secure with wheel chocks.

2. Check and Replace Transmission Fluid

• Sub-step 1: Locate the transmission fluid dipstick (if applicable) and remove it.
• Sub-step 2: Check fluid level and condition; if the fluid is low or burnt, drain the transmission fluid using a fluid pump.
• Sub-step 3: Replace with the manufacturer-approved transmission fluid (e.g., VW G052162A2).
• Sub-step 4: Refill to the correct level, then check for leaks.

3. Inspect and Repair Electrical Connections

• Sub-step 1: Visually inspect the wiring harness connected to the TCM for fraying or corrosion.
• Sub-step 2: Clean any connectors using electrical contact cleaner; ensure they are seated properly.
• Sub-step 3: Replace any damaged connectors or wiring sections as necessary.

4. Replace Faulty Sensors

• Sub-step 1: If diagnostic steps indicated faulty vehicle speed sensors (VSS) or transmission range sensor, locate the sensors on the transmission.
• Sub-step 2: Disconnect the electrical connector and remove the retaining bolts.
• Sub-step 3: Install the new sensor and reconnect the wiring harness.
• Sub-step 4: Torque the bolts to manufacturer specifications (typically around 8 Nm).

5. Reconnect Battery and Clear Codes

• Sub-step 1: Reconnect the vehicle battery and ensure all connections are secure.
• Sub-step 2: Use the OBD-II scanner to clear the P0700 code and any other related codes.
• Sub-step 3: Take the vehicle for a test drive to confirm the repair.