why am I getting a C1234 code on my Genesis G70 IG (2017-2023)

Learn how to diagnose and fix C1234 ABS issues in Genesis G70 (2017-2023). Step-by-step guide with symptoms, diagnostic steps, and repair instructions.

Solution

1. Preparation

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

2. Inspect and Replace Wheel Speed Sensors

• Tools Required: Torque wrench, socket set, multimeter, dielectric grease.
• Sub-steps:
  1. Raise the vehicle on jack stands and remove the front and rear wheels as needed.
  2. Locate each wheel speed sensor at the wheel hub assembly.
  3. Disconnect the electrical connector from the wheel speed sensor.
  4. Remove the mounting bolt securing the wheel speed sensor and carefully pull it out from the hub.
  5. Inspect the sensor for wear or damage; replace if necessary.
  6. Apply dielectric grease to the connector, then install the new or inspected sensor.
  7. Tighten the mounting bolt to the manufacturer's specified torque value (consult the repair manual for exact specs).

3. Inspect Wiring and Connectors

• Sub-steps:
  1. Visually inspect the wiring harness leading to each wheel speed sensor for frays or breaks.
  2. Clean any corrosion from the connectors using electrical contact cleaner.
  3. Repair or replace damaged wiring as needed.

4. Testing the ABS Module

• Tools Required: Multimeter.
• Sub-steps:
  1. Reconnect the battery and turn the ignition to the "ON" position without starting the engine.
  2. Use a multimeter to check the voltage at the ABS module connectors (follow vehicle-specific wiring diagrams).
  3. If the voltage readings are out of spec, consider replacing the ABS control module.