22911900 | Genuine GM® Anti-Lock Brake HCU & Module Kit 2012-2017

1. Prevents wheel lock-up

• During sudden or hard braking, wheels can lock and skid.

• The HCU rapidly adjusts brake fluid pressure to each wheel.

• This keeps the tires rolling instead of sliding.

2. Maintains steering control

• When wheels lock, you can’t steer.

• ABS lets you brake and steer at the same time, helping you avoid obstacles.

3. Improves braking on slippery surfaces

• Works especially well on:

  • Wet roads

  • Snow or ice

  • Gravel

• Reduces skidding and loss of control.

4. Supports safety systems

• The ABS module works with:

  • Traction Control

  • Electronic Stability Control (ESC)

• These systems help prevent spinning or sliding.

5. Restores proper brake system function

• Using the HCU & Module Kit replaces both the hydraulic and electronic parts together.

• Ensures proper communication and reliable braking performance.

6. Meets safety and legal requirements

• ABS is required on most modern vehicles.

• A working HCU & module keeps the vehicle road-legal and safe to drive.

Warning lights & messages

• ABS warning light stays on

• Brake warning light (red or amber)

• Traction Control / Stability Control light

• Messages like:

  • “ABS fault”

  • “Service brake system”

  • “Stability control disabled”

Braking behavior changes

• ABS doesn’t activate during hard braking

• Wheels lock up and skid on slippery roads

• Brake pedal feels hard, soft, or inconsistent

• Brake pedal pulsation is missing when ABS should be active

Vehicle handling issues

• Loss of traction control

• Loss of stability control

• Vehicle may feel unstable during emergency stops or sharp turns

Noises from ABS system

• Grinding, buzzing, or clicking noises near the ABS unit

• ABS pump runs constantly or does not run at all

Diagnostic trouble codes

• Codes related to:

  • ABS pump motor

  • Hydraulic valves

  • Internal ABS module failure

• Wheel speed sensor codes that don’t clear even after sensor replacement

Fluid or hydraulic issues

• Brake fluid leaks around the HCU

• Brake pressure imbalance between wheels

Important safety note

Even if ABS fails:

• Normal braking still works, but

• You lose ABS, traction control, and stability control safety features