GMC Sierra T1XX (2019-Present) ABS light on how to fix

Learn how to diagnose and fix the ABS light issue in 2019-present GMC Sierra T1XX. Step-by-step guide with diagnostic procedures and repair instructions.

Solution

1. Preparation

• Gather required tools and parts.
• Park the vehicle on a level surface and engage the parking brake.
• Disconnect the negative battery terminal to prevent electrical shock or short circuits.

2. Inspect and Replace ABS Sensors

• Tools Required: OBD-II scanner, multimeter, socket set, torque wrench
• Instructions:
  1. Remove the wheel corresponding to the ABS sensor that has been diagnosed as faulty.
  2. Disconnect the electrical connector from the ABS sensor.
  3. Remove the mounting bolt(s) securing the ABS sensor using the socket set.
  4. Install the new ABS sensor, ensuring it fits snugly into the hub.
  5. Reconnect the electrical connector and secure it.
  6. Replace the wheel and torque the lug nuts to the manufacturer’s specifications.

3. Repair or Replace ABS Module

• Tools Required: Torque wrench, diagnostic scanner
• Instructions:
  1. Locate the ABS module, usually found near the brake master cylinder.
  2. Disconnect the electrical connectors from the ABS module.
  3. Remove the mounting bolts and carefully pull the module away from the vehicle.
  4. Replace with a new ABS module, aligning it properly and securing it with bolts.
  5. Reconnect the electrical connectors to the module.
  6. Clear any stored error codes using the OBD-II scanner.

4. Reconnect Battery and Test

• Reconnect the negative battery terminal.
• Start the vehicle and check if the ABS warning light remains illuminated.
• Conduct a test drive to ensure normal ABS operation.