how to resolve U0121 code in my Genesis G70 IG (2017-2023)

Learn how to diagnose and fix U0121 code related to ABS communication loss in Genesis G70. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather tools and parts necessary for the repair.
• Disconnect the vehicle battery to prevent electrical shock or shorts.

2. Inspect and Repair Wiring

• Sub-steps:
  • Remove the undercarriage shield if necessary to access wiring.
  • Visually inspect the wiring harness for fraying, cuts, or damage.
  • Use a multimeter to check for continuity in the wires connecting to the ABS module.
• Tools Required: Multimeter, socket set, wire strippers/crimpers

3. Replace Faulty Components

• Sub-steps:
  • If any damaged wiring is found, splice in new wire and secure it with heat-shrink tubing.
  • If the ABS module fuse is blown, replace it with a fuse of the same amperage.
  • If the ABS module is defective, remove it by unbolting it from its mount and disconnecting the electrical connectors. Install the new module by reversing the removal steps.
• Tools Required: Socket set, screwdrivers, replacement wiring/fuses/ABS module

4. Reassemble and Reconnect

• Sub-steps:
  • Reattach any undercarriage shields removed during inspection.
  • Reconnect the vehicle battery.

5. Clear Codes and Test

• Sub-steps:
  • Use the OBD-II scanner to clear the U0121 code.
  • Start the vehicle and conduct a test drive to ensure that the ABS and traction control systems function properly.
• Tools Required: OBD-II scanner