how to diagnose C1201 error code in Volkswagen Passat B8 (2015-2022)

Learn how to diagnose and fix C1201 error code in Volkswagen Passat B8. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

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

2. Inspect and Clean Wheel Speed Sensors

• Locate the wheel speed sensors at each wheel hub.
• Remove any debris or dirt from the sensors and their mounting surfaces.
• Use a multimeter to check each sensor's resistance according to manufacturer specifications (typically between 800-1200 ohms).
• If a sensor is outside of spec, replace it.

3. Inspect ABS Module Connections

• Disconnect the ABS module's electrical connector.
• Inspect the pins for corrosion or damage; clean with electrical contact cleaner if necessary.
• Reconnect the ABS module and ensure a secure fit.

4. Replace ABS Fuse if Necessary

• Locate the fuse box and identify the ABS fuse (consult the owner's manual for the location).
• Remove the fuse and check it for continuity using a multimeter.
• Replace with the correct amperage fuse if blown.

5. Reconnect Battery and Clear Codes

• Reconnect the vehicle's battery.
• Use an OBD-II scanner to clear the C1201 error code and any other related codes.

6. Test Drive

• Conduct a test drive to ensure the repair was successful and verify that the ABS warning light is no longer illuminated.