22911902 | Genuine GM® Anti-Lock Brake HCU & Module Kit 2012-2017

An Anti-Lock Brake HCU & Module Kit 22911902 is a key part of a vehicle’s ABS (Anti-Lock Braking System). It helps you keep control of the vehicle during hard or emergency braking. ABS prevents the wheels from locking up when you brake hard. This helps you steer while braking and reduces skidding, especially on wet or slippery roads.

General Specifications

Fitment

Fitment can vary by engine build and options. Match the part number on the part you are replacing, or contact us with your vehicle details before ordering.

Purpose & Function

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.

Signs of Bad Anti-Lock Brake HCU & Module Kit

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

About GM

General Motors (GM) is one of the largest and most iconic automotive manufacturers in the world. Founded in 1908 and headquartered in Detroit, Michigan, GM designs, builds, and sells vehicles under several well-known brands, including Chevrolet, GMC, Cadillac, and Buick.
GM is known for its long history of innovation in the automotive industry, from developing early electric vehicles to advancing autonomous driving and connected car technologies. The company has a strong global presence and is committed to a future of zero crashes, zero emissions, and zero congestion, with significant investments in electric vehicles (EVs) and sustainable mobility.