88935855 | Genuine GM® ABS Anti-Lock Brake Control Module

An ABS Anti-Lock Brake Module 88935855 is the electronic control unit that manages the Anti-lock Braking System (ABS) in a vehicle. It monitors wheel speed and controls brake pressure to prevent the wheels from locking up during braking.

General Specifications

Fitment

 2003-2009 Chevrolet Kodiak GMC Topkick

Purpose & Function

• Prevent Wheel Lock-Up

  • During hard braking or slippery conditions, the ABS module modulates brake pressure to prevent the wheels from locking.

  • Locked wheels reduce traction and steering control, so ABS helps maintain directional control.

• Maintain Steering Control

  • By preventing wheel lock-up, the ABS allows the driver to continue steering while braking, which can help avoid obstacles.

• Optimize Braking Efficiency

  • The module rapidly pulses the brakes (often multiple times per second) to maximize stopping power without losing traction.

• Integrate With Other Vehicle Safety Systems

  • ABS modules often work with Electronic Stability Control (ESC), Traction Control System (TCS), and Brake Assist, providing coordinated control during emergencies.

• Monitor Wheel Speed and Brake Performance

  • The ABS module receives data from wheel speed sensors to detect traction loss and adjust brake pressure accordingly.

Signs of a Bad ABS AntiLock Brake Module

1. ABS Warning Light On

• The ABS warning light on your dashboard stays on or flashes while driving.

• This is the most obvious sign the module or system has a problem.

2. Brake Pedal Issues

• Brake pedal may feel spongy, stiff, or unresponsive.

• ABS might engage unnecessarily or fail to engage during hard braking.

3. Wheel Locking During Braking

• If wheels lock up under hard braking, the ABS is not modulating brake pressure correctly.

• Can be especially noticeable on slippery roads.

4. Unusual Brake Behavior

• Brakes pulsating when not needed or not pulsating during emergencies.

• Braking may feel uneven or jerky.

5. Inconsistent ABS Function

• Traction control or stability control warning lights may come on (since these systems often rely on the ABS module).

• ABS might work intermittently — sometimes it works, sometimes it doesn’t.

6. Failed Diagnostic Test

• Using a scan tool can show ABS module errors or communication failures with wheel speed sensors.

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.